---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
<ipython-input-23-be5f964fdbaf> in <module>
     12 
     13     chart = make_plot(df, foo, bar)
---> 14     chart.save(filepath, format="svg")
     15     ...
     16     

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair\vegalite\v4\api.py in save(self, fp, format, override_data_transformer, scale_factor, vegalite_version, vega_version, vegaembed_version, **kwargs)
    474         if override_data_transformer:
    475             with data_transformers.disable_max_rows():
--> 476                 result = save(**kwds)
    477         else:
    478             result = save(**kwds)

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair\utils\save.py in save(chart, fp, vega_version, vegaembed_version, format, mode, vegalite_version, embed_options, json_kwds, webdriver, scale_factor, **kwargs)
    110         write_file_or_filename(fp, mimebundle["text/html"], mode="w")
    111     elif format in ["png", "svg"]:
--> 112         mimebundle = spec_to_mimebundle(
    113             spec=spec,
    114             format=format,

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair\utils\mimebundle.py in spec_to_mimebundle(spec, format, mode, vega_version, vegaembed_version, vegalite_version, **kwargs)
     58                 "see http://github.com/altair-viz/altair_saver/".format(fmt=format)
     59             )
---> 60         return altair_saver.render(spec, format, mode=mode, **kwargs)
     61     if format == "html":
     62         html = spec_to_html(

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair_saver\_core.py in render(chart, fmts, mode, embed_options, method, **kwargs)
    255         Saver = _select_saver(method, mode=mode, fmt=fmt)
    256         saver = Saver(spec, mode=mode, embed_options=embed_options, **kwargs)
--> 257         mimebundle.update(saver.mimebundle(fmt))
    258 
    259     return mimebundle

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair_saver\savers\_saver.py in mimebundle(self, fmts)
     88                 vegalite_version=self._package_versions["vega-lite"],
     89             )
---> 90             bundle[mimetype] = self._serialize(fmt, "mimebundle")
     91         return bundle
     92 

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair_saver\savers\_node.py in _serialize(self, fmt, content_type)
    112 
    113         if self._mode == "vega-lite":
--> 114             spec = self._vl2vg(spec)
    115 
    116         if fmt == "vega":

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\site-packages\altair_saver\savers\_node.py in _vl2vg(self, spec)
     66             [vl2vg], input=vl_json, stderr_filter=self._stderr_filter
     67         )
---> 68         return json.loads(vg_json)
     69 
     70     def _vg2png(self, spec: JSONDict) -> bytes:

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\json\__init__.py in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    355             parse_int is None and parse_float is None and
    356             parse_constant is None and object_pairs_hook is None and not kw):
--> 357         return _default_decoder.decode(s)
    358     if cls is None:
    359         cls = JSONDecoder

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\json\decoder.py in decode(self, s, _w)
    335 
    336         """
--> 337         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338         end = _w(s, end).end()
    339         if end != len(s):

~\AppData\Local\Continuum\anaconda3\envs\rwa\lib\json\decoder.py in raw_decode(self, s, idx)
    353             obj, end = self.scan_once(s, idx)
    354         except StopIteration as err:
--> 355             raise JSONDecodeError("Expecting value", s, err.value) from None
    356         return obj, end

JSONDecodeError: Expecting value: line 2 column 1 (char 2)

from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://jupyter.org/')

$ ls ~/.npm-packages/bin
vg2pdf      vg2png      vg2svg      vl2pdf      vl2png      vl2svg      vl2vg
vg2pdf.cmd  vg2png.cmd  vg2svg.cmd  vl2pdf.cmd  vl2png.cmd  vl2svg.cmd  vl2vg.cmd

(not in PATH env variable)
TypeError: Cannot read property 'getContext' of null
    at resize (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-scenegraph\build\vega-scenegraph.js:3678:28)
    at CanvasRenderer.prototype$6.resize (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-scenegraph\build\vega-scenegraph.js:3727:5)
    at CanvasRenderer.prototype$4.initialize (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-scenegraph\build\vega-scenegraph.js:3307:17)
    at CanvasRenderer.prototype$6.initialize (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-scenegraph\build\vega-scenegraph.js:3722:28)
    at initializeRenderer (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-view\build\vega-view.js:649:8)
    at renderHeadless (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-view\build\vega-view.js:772:12)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async View.renderToCanvas [as toCanvas] (C:\Users\Jonathan.Yu\AppData\Local\Yarn\Data\global\node_modules\vega-view\build\vega-view.js:807:15)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-53-092c93936f9f> in <module>
----> 1 altair.renderers.enable('altair_saver', ['vega-lite', 'png'])

TypeError: enable() takes from 1 to 2 positional arguments but 3 were given

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-39-179b5d086901> in <module>
----> 1 alt.renderers.enable('altair_saver', ['vega-lite', 'png'])

TypeError: enable() takes from 1 to 2 positional arguments but 3 were given

# packages in environment 
#
# Name                    Version                   Build  Channel
altair                    4.1.0                      py_1    conda-forge
altair_data_server        0.4.1                      py_0    conda-forge
altair_saver              0.5.0                      py_0    conda-forge
altair_viewer             0.3.0                      py_0    conda-forge

altair 4.1.0
altair_saver 0.5.0
vega 3.5.0
vega-cli 5.17.0             
vega-lite-cli 4.17.0               
selenium 3.141.0
python-chromedriver-binary 92.0.4515.43.0

import pandas as pd
import altair as alt
from altair_saver import save
alt.renderers.enable('default'); # if in jupyter, ; to suppress output
alt.renderers.enable('altair_saver', fmts=['vega-lite', 'png']);

mytaskbars = pd.DataFrame([
    {"task": "Task1a", "start": '2020-06-01', "end": '2020-09-30', "color": 'royalblue'},
    {"task": "Task1b", "start": '2020-06-01', "end": '2021-03-31', "color": 'deepskyblue'},
    {"task": "Task2", "start": '2020-06-01', "end": '2021-03-31', "color": 'red'},
    ])
    
mytaskbars["start"] = pd.to_datetime(mytaskbars["start"])
mytaskbars["end"] = pd.to_datetime(mytaskbars["end"])
    
    
chart = alt.Chart(mytaskbars).mark_bar(opacity=0.7).encode(
    x=alt.X('start', axis=alt.Axis(title='Date', labelAngle=-45, format = ("%b %Y"))),
     x2 = 'end',
    y=alt.Y('task', axis=alt.Axis(title=None)),
    color = alt.Color('color:N', scale = None)
    )
    
save(chart, "chart_202006.png")
chart

ValueError                                Traceback (most recent call last)
<ipython-input-3-13a284c2aca9> in <module>
     19     )
     20 
---> 21 save(chart, "chart_202006.png")
     22 chart

~\anaconda3\envs\geospat_env\lib\site-packages\altair_saver\_core.py in save(chart, fp, fmt, mode, method, **kwargs)
     60     """
     61     if method is None:
---> 62         Saver = _get_saver_for_format(fmt=fmt, fp=fp)
     63     elif isinstance(method, type):
     64         Saver = method

~\anaconda3\envs\geospat_env\lib\site-packages\altair_saver\_core.py in _get_saver_for_format(fmt, fp)
     28         if fmt in s.valid_formats and s.enabled():
     29             return s
---> 30     raise ValueError(f"Unsupported format: {fmt!r}")
     31 
     32 

ValueError: Unsupported format: 'png'

import sys 
import altair as alt
from altair_saver import save
infile = sys.stdin() if sys.argv[1]=="-" else open(sys.argv[1])
chart = alt.Chart.from_json(infile.read())
save(chart,sys.argv[2])

Traceback (most recent call last):
  File "/usr/local/bin/covid19pr", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/site-packages/covid_19_puerto_rico/__init__.py", line 81, in main
    target.render(date_range)
  File "/usr/local/lib/python3.7/site-packages/covid_19_puerto_rico/charts.py", line 29, in render
    self.render_bulletin_date(df, bulletin_date)
  File "/usr/local/lib/python3.7/site-packages/covid_19_puerto_rico/charts.py", line 37, in render_bulletin_date
    self.output_formats)
  File "/usr/local/lib/python3.7/site-packages/covid_19_puerto_rico/util.py", line 42, in save_chart
    chart.save(filename)
  File "/usr/local/lib/python3.7/site-packages/altair/vegalite/v4/api.py", line 476, in save
    result = save(**kwds)
  File "/usr/local/lib/python3.7/site-packages/altair/utils/save.py", line 121, in save
    **kwargs,
  File "/usr/local/lib/python3.7/site-packages/altair/utils/mimebundle.py", line 60, in spec_to_mimebundle
    return altair_saver.render(spec, format, mode=mode, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/altair_saver/_core.py", line 257, in render
    mimebundle.update(saver.mimebundle(fmt))
  File "/usr/local/lib/python3.7/site-packages/altair_saver/savers/_saver.py", line 90, in mimebundle
    bundle[mimetype] = self._serialize(fmt, "mimebundle")
  File "/usr/local/lib/python3.7/site-packages/altair_saver/savers/_selenium.py", line 284, in _serialize
    out = self._extract(fmt)
  File "/usr/local/lib/python3.7/site-packages/altair_saver/savers/_selenium.py", line 278, in _extract
    result = driver.execute_async_script(EXTRACT_CODE, self._spec, opt, fmt)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 659, in execute_async_script
    'args': converted_args})['value']
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidArgumentException: Message: invalid argument: missing command parameters

import altair as alt
from altair_saver import save
import numpy as np
import pandas as pd

alt.data_transformers.disable_max_rows()
condition = ['Dry', 'Wet']
RSDF9 = pd.DataFrame({
    'DAY': pd.date_range('1990-01-01', freq='D', periods=10000),
    'CONDITION_RR': np.random.choice(condition , 10000,)
})

bar3 = alt.Chart(RSDF9).mark_bar().encode(
    alt.X('monthdate(DAY):O', title='day', axis=alt.Axis(tickCount=5)),
    alt.Y('year(DAY):O', title='year'),
    alt.Color('CONDITION_RR:N',
              scale=alt.Scale(
              domain=['Dry', 'Wet'],
              range=['#d62728', '#1f77b4'])),
    order=alt.Order("CONDITION_RR", sort="ascending")
)
(bar3).properties(width=600, title="Dry and Wet season (1983 - 2019)").configure_axisX(labelAlign="right", labelAngle=-45, titlePadding=5)
save(bar3, 'development_dry_season.svg')

ConnectionRefusedError                    Traceback (most recent call last)
/usr/local/lib/python3.7/site-packages/urllib3/connection.py in _new_conn(self)
    156             conn = connection.create_connection(
--> 157                 (self._dns_host, self.port), self.timeout, **extra_kw
    158             )

/usr/local/lib/python3.7/site-packages/urllib3/util/connection.py in create_connection(address, timeout, source_address, socket_options)
     83     if err is not None:
---> 84         raise err
     85 

/usr/local/lib/python3.7/site-packages/urllib3/util/connection.py in create_connection(address, timeout, source_address, socket_options)
     73                 sock.bind(source_address)
---> 74             sock.connect(sa)
     75             return sock

ConnectionRefusedError: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

NewConnectionError                        Traceback (most recent call last)
/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
    671                 headers=headers,
--> 672                 chunked=chunked,
    673             )

/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in _make_request(self, conn, method, url, timeout, chunked, **httplib_request_kw)
    386         else:
--> 387             conn.request(method, url, **httplib_request_kw)
    388 

/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py in request(self, method, url, body, headers, encode_chunked)
   1243         """Send a complete request to the server."""
-> 1244         self._send_request(method, url, body, headers, encode_chunked)
   1245 

/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py in _send_request(self, method, url, body, headers, encode_chunked)
   1289             body = _encode(body, 'body')
-> 1290         self.endheaders(body, encode_chunked=encode_chunked)
   1291 

/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py in endheaders(self, message_body, encode_chunked)
   1238             raise CannotSendHeader()
-> 1239         self._send_output(message_body, encode_chunked=encode_chunked)
   1240 

/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py in _send_output(self, message_body, encode_chunked)
   1025         del self._buffer[:]
-> 1026         self.send(msg)
   1027 

/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py in send(self, data)
    965             if self.auto_open:
--> 966                 self.connect()
    967             else:

/usr/local/lib/python3.7/site-packages/urllib3/connection.py in connect(self)
    183     def connect(self):
--> 184         conn = self._new_conn()
    185         self._prepare_conn(conn)

/usr/local/lib/python3.7/site-packages/urllib3/connection.py in _new_conn(self)
    168             raise NewConnectionError(
--> 169                 self, "Failed to establish a new connection: %s" % e
    170             )

NewConnectionError: <urllib3.connection.HTTPConnection object at 0x147bf2a90>: Failed to establish a new connection: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

MaxRetryError                             Traceback (most recent call last)
<ipython-input-147-2a814c35573f> in <module>
----> 1 save(label_summary_graph,'summary_graph.png')

/usr/local/lib/python3.7/site-packages/altair_saver/_core.py in save(chart, fp, fmt, mode, method, **kwargs)

/usr/local/lib/python3.7/site-packages/altair_saver/savers/_saver.py in save(self, fp, fmt)

/usr/local/lib/python3.7/site-packages/altair_saver/savers/_saver.py in mimebundle(self, fmts)

/usr/local/lib/python3.7/site-packages/altair_saver/savers/_selenium.py in _mimebundle(self, fmt)

/usr/local/lib/python3.7/site-packages/altair_saver/savers/_selenium.py in _extract(self, fmt)

/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py in get(self, url)
    331         Loads a web page in the current browser session.
    332         """
--> 333         self.execute(Command.GET, {'url': url})
    334 
    335     @property

/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
    317 
    318         params = self._wrap_value(params)
--> 319         response = self.command_executor.execute(driver_command, params)
    320         if response:
    321             self.error_handler.check_response(response)

/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/remote_connection.py in execute(self, command, params)
    372         data = utils.dump_json(params)
    373         url = '%s%s' % (self._url, path)
--> 374         return self._request(command_info[0], url, body=data)
    375 
    376     def _request(self, method, url, body=None):

/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/remote_connection.py in _request(self, method, url, body)
    395 
    396         if self.keep_alive:
--> 397             resp = self._conn.request(method, url, body=body, headers=headers)
    398 
    399             statuscode = resp.status

/usr/local/lib/python3.7/site-packages/urllib3/request.py in request(self, method, url, fields, headers, **urlopen_kw)
     78         else:
     79             return self.request_encode_body(
---> 80                 method, url, fields=fields, headers=headers, **urlopen_kw
     81             )
     82 

/usr/local/lib/python3.7/site-packages/urllib3/request.py in request_encode_body(self, method, url, fields, headers, encode_multipart, multipart_boundary, **urlopen_kw)
    169         extra_kw.update(urlopen_kw)
    170 
--> 171         return self.urlopen(method, url, **extra_kw)

/usr/local/lib/python3.7/site-packages/urllib3/poolmanager.py in urlopen(self, method, url, redirect, **kw)
    328             response = conn.urlopen(method, url, **kw)
    329         else:
--> 330             response = conn.urlopen(method, u.request_uri, **kw)
    331 
    332         redirect_location = redirect and response.get_redirect_location()

/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
    760                 release_conn=release_conn,
    761                 body_pos=body_pos,
--> 762                 **response_kw
    763             )
    764 

/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
    760                 release_conn=release_conn,
    761                 body_pos=body_pos,
--> 762                 **response_kw
    763             )
    764 

/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
    760                 release_conn=release_conn,
    761                 body_pos=body_pos,
--> 762                 **response_kw
    763             )
    764 

/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
    718 
    719             retries = retries.increment(
--> 720                 method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
    721             )
    722             retries.sleep()

/usr/local/lib/python3.7/site-packages/urllib3/util/retry.py in increment(self, method, url, response, error, _pool, _stacktrace)
    434 
    435         if new_retry.is_exhausted():
--> 436             raise MaxRetryError(_pool, url, error or ResponseError(cause))
    437 
    438         log.debug("Incremented Retry for (url='%s'): %r", url, new_retry)

MaxRetryError: HTTPConnectionPool(host='127.0.0.1', port=61028): Max retries exceeded with url: /session/cd2aa6c78fe58e790b74bd08e7eb0653/url (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x147bf2a90>: Failed to establish a new connection: [Errno 61] Connection refused'))

altair.renderers.enable("png", scale_factor=3.0)

WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

    chart = pygal.Line(disable_xml_declaration=True, x_label_rotation=45)
    return chart.render(is_unicode=True)

/home/user/miniconda3/envs/track/lib/vega-cli/node_modules/vega-dataflow/build/vega-dataflow.js:43
  async function asyncCallback(df, callback) {
        ^^^^^^^^

SyntaxError: Unexpected token function
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:549:28)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/user/miniconda3/envs/track/lib/vega-cli/node_modules/vega/build/vega-node.js:6:20)

import tempfile
from IPython.display import Image

def show(chart):
    file = tempfile.mktemp(suffix='.png')
    chart.save(file)
    return Image(file)

fig_glutathione_seed.save('fig_glutathione_seed.svg')

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-19-2aedd223090b> in <module>
----> 1 fig_glutathione_seed.save('fig_glutathione_seed.svg')

/usr/local/lib/python3.7/site-packages/altair/vegalite/v4/api.py in save(self, fp, format, override_data_transformer, scale_factor, vegalite_version, vega_version, vegaembed_version, **kwargs)
    474         if override_data_transformer:
    475             with data_transformers.disable_max_rows():
--> 476                 result = save(**kwds)
    477         else:
    478             result = save(**kwds)

/usr/local/lib/python3.7/site-packages/altair/utils/save.py in save(chart, fp, vega_version, vegaembed_version, format, mode, vegalite_version, embed_options, json_kwds, webdriver, scale_factor, **kwargs)
    119             webdriver=webdriver,
    120             scale_factor=scale_factor,
--> 121             **kwargs,
    122         )
    123         if format == "png":

/usr/local/lib/python3.7/site-packages/altair/utils/mimebundle.py in spec_to_mimebundle(spec, format, mode, vega_version, vegaembed_version, vegalite_version, **kwargs)
     58                 "see http://github.com/altair-viz/altair_saver/".format(fmt=format)
     59             )
---> 60         return altair_saver.render(spec, format, mode=mode, **kwargs)
     61     if format == "html":
     62         html = spec_to_html(

/usr/local/lib/python3.7/site-packages/altair_saver/_core.py in render(chart, fmts, mode, embed_options, method, **kwargs)
    253 
    254     for fmt in fmts:
--> 255         Saver = _select_saver(method, mode=mode, fmt=fmt)
    256         saver = Saver(spec, mode=mode, embed_options=embed_options, **kwargs)
    257         mimebundle.update(saver.mimebundle(fmt))

/usr/local/lib/python3.7/site-packages/altair_saver/_core.py in _select_saver(method, mode, fmt, fp)
     67             if s.enabled() and fmt in s.valid_formats[mode]:
     68                 return s
---> 69         raise ValueError(f"No enabled saver found that supports format={fmt!r}")
     70     else:
     71         raise ValueError(f"Unrecognized method: {method}")

ValueError: No enabled saver found that supports format='svg'

Traceback (most recent call last):
  File "./scripts/generate_chart.py", line 231, in <module>
    sys.exit(main())
  File "./scripts/generate_chart.py", line 145, in main
    package_name.save_chart(data_def, args.output_directory, "name")
  File "/Users/user/Workspace/package-name/package_name/__init__.py", line 49, in save_chart
    altair_saver.save(chart, **option_set)
  File "/Users/user/.virtualenvs/venv36/src/altair-saver/altair_saver/_core.py", line 172, in save
    return saver.save(fp=fp, fmt=fmt)
  File "/Users/user/.virtualenvs/venv36/src/altair-saver/altair_saver/savers/_saver.py", line 121, in save
    content = self._serialize(fmt, "save")
  File "/Users/user/.virtualenvs/venv36/src/altair-saver/altair_saver/savers/_selenium.py", line 284, in _serialize
    out = self._extract(fmt)
  File "/Users/user/.virtualenvs/venv36/src/altair-saver/altair_saver/savers/_selenium.py", line 280, in _extract
    raise JavascriptError(result["error"])
altair_saver.savers._selenium.JavascriptError: TypeError: Cannot read property 'orient' of undefined

-e git+https://github.com/altair-viz/altair.git@81b40755c51b5821b078d36702b3cccadfc84071#egg=altair
-e git+https://github.com/altair-viz/altair_saver.git@3c8e1102776a7acd2c971354190a283c394d1cfd#egg=altair-saver
altair-data-server==0.4.1
altair-viewer==0.3.0
attrs==20.3.0
entrypoints==0.3
importlib-metadata==3.3.0
Jinja2==2.11.2
jsonschema==3.2.0
MarkupSafe==1.1.1
numpy==1.19.5
pandas==1.1.5
portpicker==1.3.1
pyrsistent==0.17.3
python-dateutil==2.8.1
pytz==2020.5
selenium==3.141.0
six==1.15.0
toolz==0.11.1
tornado==6.1
typing-extensions==3.7.4.3
urllib3==1.26.2
vega-datasets==0.9.0
vegascope==1.0.14
zipp==3.4.0

File "scripts/visualize_questions.py", line 61, in <module>
[11](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:12)
    chart.save('images/topics.png',webdriver='firefox',scale_factor=2)
[12](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:13)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair/vegalite/v4/api.py", line 488, in save
[13](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:14)
    result = save(**kwds)
[14](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:15)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair/utils/save.py", line 116, in save
[15](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:16)
    mimebundle = spec_to_mimebundle(
[16](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:17)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair/utils/mimebundle.py", line 60, in spec_to_mimebundle
[17](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:18)
    return altair_saver.render(spec, format, mode=mode, **kwargs)
[18](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:19)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair_saver/_core.py", line 257, in render
[19](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:20)
    mimebundle.update(saver.mimebundle(fmt))
[20](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:21)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair_saver/savers/_saver.py", line 90, in mimebundle
[21](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:22)
    bundle[mimetype] = self._serialize(fmt, "mimebundle")
[22](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:23)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair_saver/savers/_selenium.py", line 284, in _serialize
[23](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:24)
    out = self._extract(fmt)
[24](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:25)
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/altair_saver/savers/_selenium.py", line 267, in _extract
[25](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:26)
    driver.find_element_by_id("vis")
[26](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:27)
AttributeError: 'WebDriver' object has no attribute 'find_element_by_id'
[27](https://github.com/open-resources/physics_bank/runs/7099958015?check_suite_focus=true#step:6:28)
WARNING:tornado.access:404 GET /favicon.ico (127.0.0.1) 0.41ms

AttributeError: 'WebDriver' object has no attribute 'find_element_by_id'

# Test Case
import altair as alt
from altair_saver import save as alt_save
import numpy as np
import pandas as pd
# make simple data frame
test_data = pd.DataFrame.from_dict({ 'x': np.arange(0,10), 'y':np.arange(0,10)})
# make a chart with Altair
test_data_chart = alt.Chart(test_data).mark_line().encode(x=alt.X('x'),y=alt.Y('y'))
# display it (renders fine in notebook, using Chrome)
test_data_chart

# Test Case 1:
test_data_chart.save('testoutput.png')

---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
<ipython-input-29-2049dff4a23c> in <module>
      1 # Test Case 1:
----> 2 test_data_chart.save('testoutput.png')

C:\ProgramData\Anaconda3\envs\myenvname\lib\site-packages\altair\vegalite\v4\api.py in save(self, fp, format, override_data_transformer, scale_factor, vegalite_version, vega_version, vegaembed_version, **kwargs)
    474         if override_data_transformer:
    475             with data_transformers.disable_max_rows():
--> 476                 result = save(**kwds)
    477         else:
    478             result = save(**kwds)

C:\ProgramData\Anaconda3\envs\myenvname\lib\site-packages\altair\utils\save.py in save(chart, fp, vega_version, vegaembed_version, format, mode, vegalite_version, embed_options, json_kwds, webdriver, scale_factor, **kwargs)
    119             webdriver=webdriver,
    120             scale_factor=scale_factor,
--> 121             **kwargs,
    122         )
    123         if format == "png":

C:\ProgramData\Anaconda3\myenvname\lib\site-packages\altair\utils\mimebundle.py in spec_to_mimebundle(spec, format, mode, vega_version, vegaembed_version, vegalite_version, **kwargs)
     58                 "see http://github.com/altair-viz/altair_saver/".format(fmt=format)
     59             )
---> 60         return altair_saver.render(spec, format, mode=mode, **kwargs)
     61     if format == "html":
     62         html = spec_to_html(

C:\ProgramData\Anaconda3\myenvname\lib\site-packages\altair_saver\_core.py in render(chart, fmts, mode, embed_options, method, **kwargs)
    255         Saver = _select_saver(method, mode=mode, fmt=fmt)
    256         saver = Saver(spec, mode=mode, embed_options=embed_options, **kwargs)
--> 257         mimebundle.update(saver.mimebundle(fmt))
    258 
    259     return mimebundle

C:\ProgramData\Anaconda3\myenvname\lib\site-packages\altair_saver\savers\_saver.py in mimebundle(self, fmts)
     88                 vegalite_version=self._package_versions["vega-lite"],
     89             )
---> 90             bundle[mimetype] = self._serialize(fmt, "mimebundle")
     91         return bundle
     92 

C:\ProgramData\Anaconda3\myenvname\lib\site-packages\altair_saver\savers\_node.py in _serialize(self, fmt, content_type)
    112 
    113         if self._mode == "vega-lite":
--> 114             spec = self._vl2vg(spec)
    115 
    116         if fmt == "vega":

C:\ProgramData\Anaconda3\myenvname\lib\site-packages\altair_saver\savers\_node.py in _vl2vg(self, spec)
     66             [vl2vg], input=vl_json, stderr_filter=self._stderr_filter
     67         )
---> 68         return json.loads(vg_json)
     69 
     70     def _vg2png(self, spec: JSONDict) -> bytes:

C:\ProgramData\Anaconda3\myenvname\lib\json\__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    346             parse_int is None and parse_float is None and
    347             parse_constant is None and object_pairs_hook is None and not kw):
--> 348         return _default_decoder.decode(s)
    349     if cls is None:
    350         cls = JSONDecoder

C:\ProgramData\Anaconda3\envs\myenvname\lib\json\decoder.py in decode(self, s, _w)
    335 
    336         """
--> 337         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338         end = _w(s, end).end()
    339         if end != len(s):

C:\ProgramData\Anaconda3\envs\myenvname\lib\json\decoder.py in raw_decode(self, s, idx)
    353             obj, end = self.scan_once(s, idx)
    354         except StopIteration as err:
--> 355             raise JSONDecodeError("Expecting value", s, err.value) from None
    356         return obj, end

JSONDecodeError: Expecting value: line 2 column 1 (char 2)

# Try vega
test_data_chart.save('testoutput.png',mode='vega')

# testout.png contains this text (not a png file):
C:\>node C:/ProgramData/Anaconda3/envs/myenvname\Library\share\vega-cli\node_modules\vega-cli\bin\vg2png ""

Traceback (most recent call last):
  File "/home/dhuck/projects/notebooks/COVID/update.py", line 466, in <module>
    main()
  File "/home/dhuck/projects/notebooks/COVID/update.py", line 456, in main
    save(world, world_file)
  File "/home/dhuck/projects/notebooks/.env/lib/python3.6/site-packages/altair_saver/_core.py", line 157
+, in save
    Saver = _select_saver(method, mode=mode, fmt=fmt, fp=fp)
  File "/home/dhuck/projects/notebooks/.env/lib/python3.6/site-packages/altair_saver/_core.py", line 72,
+in _select_saver
    raise ValueError(f"No enabled saver found that supports format={fmt!r}")
ValueError: No enabled saver found that supports format='vega'

world_file    = f'{PWD}/data/world_covid.vg.json'
save(world, world_file)

--------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
c:\Users\Harari\Documents\GitHub\MarketSimulation\V3_Economy\main.py in 
----> 1 from altair_saver import save

~\Anaconda3\lib\site-packages\altair_saver\__init__.py in 
      1 """Tools for saving altair charts"""
----> 2 from ._core import render, save
      3 from .savers import Saver, BasicSaver, HTMLSaver, NodeSaver, SeleniumSaver
      4 
      5 __version__ = "0.1.0"

~\Anaconda3\lib\site-packages\altair_saver\_core.py in 
      3 import altair as alt
      4 
----> 5 from altair_saver.savers import (
      6     Saver,
      7     BasicSaver,

~\Anaconda3\lib\site-packages\altair_saver\savers\__init__.py in 
      1 from ._saver import Saver
      2 from ._basic import BasicSaver
----> 3 from ._html import HTMLSaver
      4 from ._node import NodeSaver
      5 from ._selenium import SeleniumSaver

~\Anaconda3\lib\site-packages\altair_saver\savers\_html.py in 
      5 from altair_saver.savers import Saver
      6 from altair_saver._utils import JSONDict, Mimebundle, fmt_to_mimetype
----> 7 from altair_viewer import get_bundled_script
      8 
      9 HTML_TEMPLATE = """

~\Anaconda3\lib\site-packages\altair_viewer\__init__.py in 
      4 __all__ = ["ChartViewer", "display", "render", "show", "get_bundled_script"]
      5 
----> 6 from altair_viewer._viewer import ChartViewer
      7 from altair_viewer._scripts import get_bundled_script
      8 

~\Anaconda3\lib\site-packages\altair_viewer\_viewer.py in 
      6 
      7 import altair as alt
----> 8 from altair_data_server import Provider, Resource
      9 from altair_viewer._scripts import get_bundled_script
     10 from altair_viewer._event_provider import EventProvider, DataSource

~\Anaconda3\lib\site-packages\altair_data_server\__init__.py in 
      9 ]
     10 
---> 11 from ._altair_server import AltairDataServer, data_server, data_server_proxied
     12 from ._provide import Provider, Resource

~\Anaconda3\lib\site-packages\altair_data_server\_altair_server.py in 
      4 from urllib import parse
      5 
----> 6 from altair_data_server._provide import Provider, Resource
      7 from altair.utils.data import (
      8     _data_to_json_string,

~\Anaconda3\lib\site-packages\altair_data_server\_provide.py in 
     29 import tornado.wsgi
     30 
---> 31 from altair_data_server import _background_server
     32 
     33 

~\Anaconda3\lib\site-packages\altair_data_server\_background_server.py in 
     20 import threading
     21 
---> 22 import portpicker
     23 import tornado
     24 import tornado.web

ModuleNotFoundError: No module named 'portpicker'

alt.renderers.enable('altair_saver', fmts=['vega-lite', 'svg'])