Python boolean value

下列对象的布尔值都是False：NONE;False(布尔类型)所有的值为零的数       0（整型）       0.0（浮点型）       0L(长整型)       0.0+0.0j(复数)""(空字符串)[](空列表)()(空元组){}(空字典)

Dictionaries can also be user Boolean tested

dict_1 = {}dict_2 = {‘a‘:123} if dict_1:    print(‘dict_1 is not null‘)else:    print(‘dict_1 is null‘) if dict_2:    print(‘dict_2 is not null‘)else:    print(‘dict_2 is null‘)

Output:

dict_1 is nulldict_2 is not null

It can be seen that the dictionary type is also used for Boolean testing.

Python boolean value