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