在python中bool函数的取值方法

>>> bool(0)False>>> bool(1)True>>> bool(-1)True>>> bool(21334)True

>>> bool('')False>>> bool(None)False>>> bool('asd')True>>> bool('hello')True

>>> a = []>>> bool(a)False>>> a.append(1)>>> bool(a)True

>>> x = raw_input('Please enter a number :')Please enter a number :>>> bool(x.strip())False>>> x = raw_input('Please enter a number :')Please enter a number :4>>> bool(x.strip())True