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Fixes #686 #689

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Mar 17, 2016
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Fixes #686 #689

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10 changes: 7 additions & 3 deletions docs/writing/structure.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -658,16 +658,20 @@ And now the generator approach using Python's own
@contextmanager
def custom_open(filename):
f = open(filename)
yield f
f.close()
try:
yield f
finally:
f.close()

with custom_open('file') as f:
contents = f.read()

This works in exactly the same way as the class example above, albeit it's
more terse. The ``custom_open`` function executes until it reaches the ``yield``
statement. It then gives control back to the ``with`` statement, which assigns
whatever was ``yield``'ed to `f` in the ``as f`` portion.
whatever was ``yield``'ed to `f` in the ``as f`` portion. The ``finally`` clause
ensures that ``close()`` is called whether or not there was an exception inside
the ``with``.

Since the two approaches appear the same, we should follow the Zen of Python
to decide when to use which. The class approach might be better if there's
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