[issue22138] patch.object doesn't restore function defaults

[Xiadong Zhu]

Xiadong Zhu added the comment:

How's the issue going on?

The situation to mock function's ``__defaults__`` attribute is general, as 
default argument is determinate after function definition, when we need to test 
a function such as:

def access_db(statement, backend=default_db_backend):
return default_db_backend.execute(statement)

that we must mock ``__defaults__`` attribute if we want to invoke it with 
default backend.

It has one year past, though I could patch the ``_patch`` class but it's dirty, 
is the issue a defect can be fixed or unsolvable?

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What's the difference between gevent.sleep and time.sleep?

[Xiadong Zhu]

Hi, I'm learning gevent, but I didn't found the difference with gevent.sleep 
and time.sleep, does anybody could give me a sample code to show their 
difference? Thanks!
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