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From: Jabba Laci <jabba.laci@gmail.com>
Date: Thu, 19 Jan 2012 21:45:38 +0100
Subject: verify the return value of a function
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19138

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