In Python empty container equals False in 'if' statements:
# prints "It's ok"
if not []:
print "It's ok"
Let's create a simple Foo class:
class Foo:
pass
Now I can use Foo objects in 'if' statements:
#prints "Ouch!"
f=Foo()
if f:
print "Ouch!"
So, default __nonzero__ impl is to return True. I think, this
behaviour conflicts with 'Explicit is better than implicit' and
'Practicality beats purity' statements. I think, throwing a TypeError
exception would be better. It will result in more explicit code with
fewer errors.
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