请参阅Python文档__nonzero__。
class foo(object):
def __nonzero__( self) :
return self.bar % 2 == 0
def a(foo):
if foo:
print "spam"
else:
print "eggs"
def main():
myfoo = foo()
myfoo.bar = 3
a(myfoo)
if __name__ == "__main__":
main()
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