python中and和or一个短路逻辑

True  and True    ==> True                  True  or True    ==> True
True  and False   ==> False                 True  or False   ==> True
False and True    ==> False                 False or True    ==> True
False and False   ==> False                 False or False   ==> False

a='b'
c='dd'

print(c or a)#是下面这个意思
if c:
    print(c)
else:
    print(a)
#结果：
dd
dd

print(c and a)
if c:
    print(a)
else:
    print(c)
#结果：
b
b