Detailed introduction to Python's built-in bool function

English document:

class bool([x])

Return a Boolean value, i.e. one of True or False. x is converted using the standard truth testing procedure. If x is false or omitted, this returns False; otherwise it returns True. The bool class is a subclass of int (see Numeric Types — int, float, complex). It cannot be subclassed further. Its only instances are False and True (see Boolean Values).

Instructions:

1. The return value is a Boolean value of True or False

2. If the parameter is default, False will be returned

>>> bool() #未传入参数
False

3. Parameter conversion uses standard logical test expressions

3.1 When the Boolean type is passed in, the original value will be used Return

>>> bool(True)
True
>>> bool(False)
False

3.2 When a string is passed in, the empty string returns False, otherwise True

>>> bool('')
False
>>> bool('0')
True

3.3 Pass in a value When the value is 0, False is returned, otherwise True is returned Otherwise return True

>>> bool(0)
False
>>> bool(1)
True
>>> bool(-1.0)
True

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