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the code in https://github.com/sagemathinc/cocalc-example-files/blob/master/julia/julia-first-steps.ipynb is outdated.

if x is an array, then x .+ 2 adds 2 to every element. Notice the dot (.).

Moved from sagemathinc/cocalc#97

Please help me to understand why the following example doesn't work:
https://github.com/sagemath/cloud-examples/blob/master/webservice/main.py

Wow, that's broken in many ways, due to it being written years ago and
a lot changing since then. I've rewritten it just now so it works:

https://share.cocalc.com/share/df81e09e5b8f16f28b3a2e818dcdd4560e7818ae/support/2015-09-02-090517-webserver/?viewer=share

You should easily be able to use the above to get going with flask
development. Note that you have to prepend that "base_url" thing
before each url route. There's probably a proper way to do this with

When trying to run this worksheet on a self-hosted cocalc instance (docker container built/pulled on 2021-04-15), various cells fail to run. For example:

# embed external web page
from IPython.core.display import HTML
HTML('<iframe src="https://en.m.wikipedia.org/" width="95%" height=350>')

results in the following:

Error in lines 1-1
Traceback (most recent call last):
  File "/usr/local/sage/local/lib/python3.8/site-packages/smc_sagews/sage_server.py", line 1230, in execute
    exec(
  File "", line 1, in <module>
  File "/usr/local/sage/local/lib/python3.8/site-packages/smc_sagews/sage_server.py", line 1324, in execute_with_code_decorators
    code = code_decorator(code)
  File "/usr/local/sage/local/lib/python3.8/site-packages/smc_sagews/sage_jupyter.py", line 360, in run_code
    display_mime(content['data'])
  File "/usr/local/sage/local/lib/python3.8/site-packages/smc_sagews/sage_jupyter.py", line 292, in display_mime
    show(msg_data['text/latex'])
KeyError: 'text/latex'

Either the example code is no longer valid, or is there a bug in sage/cocalc, it seems.

See this ticket: sagemathinc/cocalc#347

in particular, a first-steps document, where such an example file explains what the UI in cocalc shows and that it works with files ending in ".lean", etc.

below, a very simple example should be enough.