Python: Advanced Guide to Programming Code with Python (Python, Java, JavaScript, Programming, Code, Project Management, Computer Programming Book 4) by Charlie Masterson

Author:Charlie Masterson [Masterson, Charlie]
Language: eng
Format: epub
Published: 2017-02-09T08:00:00+00:00

try this:

do_something_dangerous()

except:

print('Got an exception')

lock.acquire()

print('Got here')

Really, there isn’t any reasonable way of acquiring Lock through a context manager and then not releasing it and that is exactly as it should be.

Having Fun withcontextlib

Because context managers are so very useful, there is an entire Standard Library module that is devoted to them and them alone.contextlib is full of useful tool for creating context managers and for working with them. One very good shortcut to create a context manager from classes is to use the decorator@contextmanager. You use this by decorating a generator function that will call yield only once. Anything that comes before the yield call is considered to be the code for__enter__() and everything after is the considered to be the code for__exit__().

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