Ezio Melotti added the comment:
'a' evaluates to true, but it's not equal to True:
>>> bool('a')
True
>>> 'a' == True
False
but 1 and True are equal (for historical reasons):
>>> 1 == True
True
Similarly '' evaluates to false, but it's not equal to False:
>>> bool('')
False
>>> '' == False
False
whereas 0 is equal to False:
>>> 0 == False
True
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<http://bugs.python.org/issue21993>
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