python - 如果它是某个类，我怎么能有条件地只记录一些东西？

Question

像这样:

if self.__class__ == "User":
                logging.debug("%s non_pks were found" %  (str(len(non_pks))) )

In [2]: user = User.objects.get(pk=1)

In [3]: user.__class__
Out[3]: <class 'django.contrib.auth.models.User'>

In [4]: if user.__class__ == 'django.contrib.auth.models.User': print "yes"
   ...: 

In [5]: user.__class__ == 'django.contrib.auth.models.User'
Out[5]: False

In [6]: user.__class__ == 'User'
Out[6]: False

In [7]: user.__class__ == "<class 'django.contrib.auth.models.User'>"
Out[7]: False

Answer 1

类是 Python 中的第一类对象:

>>> class Foo(object):
...     pass
... 
>>> a = Foo()
>>> a.__class__ == Foo
True

注意:它们不是字符串，它们是对象。不要与 "Foo" 进行比较，而是与 Foo

进行比较