变量:布尔

if 1 < 2:
    print True  # here
else:
    print False

if "ABCD1234".isalnum():
    print True  # here
else:
    print False

if []:
    print True
else:
    print False  # here

if "":
    print True
else:
    print False  # here

% python var/boolandnone.py                                                 ✭
True
True
False
False