Logical values of objects in Python __python

None in Python, False, empty string "", 0, empty list [], empty Dictionary {}, NULL tuple () logical value is False, that is:
[Python] <strong>not None = = not False = = not ' = = not 0 = not [] = not {} = Not () </strong>
So when using a list, if you want to differentiate between x==[] and x = = None Two, use the not logical operator to determine whether an object is an empty list, a ganso, a dictionary, and whether the object is none with the member operator is or not

Not x means equivalent to if X is false, then True, else false

x = [] If not x:print (' x is empty ')
y = None if Y is none:      print (' Y are none ') = = is the equivalence of two objects. and is to determine whether two objects are the same object, that is, their IDs are consistent. IS and = = difference: is used to determine whether two variable reference objects are the same, = = to determine whether the value of a reference variable is equal. >>>  a   =   [1,   2,   3] >>>   b   =   a >>> &nbs P b   is   a True >>>   b   =   A True >>>   b   =   A [:] > >>   B   is   a False >>>   b   =   a True