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bslatkin avatar bslatkin commented on September 13, 2024

But the point is, yielding a return-looking value from a generator won't run the try/except/finally blocks:

>>> class Return(object):
...     def __init__(self, value):
...         self.value = value
... 
>>> def foo():
...   try:
...     yield 1
...     yield Return(5)
...   finally:
...     print('hi')
... 
>>> it = foo()
>>> it.next()
1
>>> it.next()
<__main__.Return object at 0x10753de50>
>>> it.next()
hi
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

To get the right behavior, you need to raise an exception:

>>> class Return(Exception):
...     def __init__(self, value):
...         self.value = value
... 
>>> def foo():
...   try:
...     yield 1
...     raise Return(5)
...   finally:
...     print('hi')
... 
>>> it = foo()
>>> it.next()
1
>>> it.next()
hi
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in foo
__main__.Return

from effectivepython.

bslatkin avatar bslatkin commented on September 13, 2024

Original source

from effectivepython.

bslatkin avatar bslatkin commented on September 13, 2024

Fixed in next printing.

from effectivepython.

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