Groups > comp.lang.python > #19138

verify the return value of a function

From	Jabba Laci <jabba.laci@gmail.com>
Date	2012-01-19 21:45 +0100
Subject	verify the return value of a function
Newsgroups	comp.lang.python
Message-ID	<mailman.4872.1327005963.27778.python-list@python.org> (permalink)

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Hi,

In a unit test, I want to verify that a function returns a
cookielib.LWPCookieJar object. What is the correct way of doing that?

1) First I tried to figure out its type with type(return_value) but it
is <type 'instance'>

2) return_value.__class__ .__name__ gives 'LWPCookieJar', which is bettter

3) isinstance(return_value, cookielib.LWPCookieJar) seems to be the
best way, however somewhere I read that using isinstance is
discouraged

Thanks,

Laszlo

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verify the return value of a function Jabba Laci <jabba.laci@gmail.com> - 2012-01-19 21:45 +0100
  Re: verify the return value of a function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-01-20 10:15 +0100
  Re: verify the return value of a function Roy Smith <roy@panix.com> - 2012-01-20 09:24 -0500

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