比较运算符
> >=
< <=
==
!=
print(10!=11)
了解
x=none
print(x == None)
print(x is None)
l1=['abc',1,['a','b','c']]
l2=['abc','aa',]
print(l2>l1)
2. 运算逻辑符
and:连接左右两个条件,只有两个条件同时成立时爱你的运算的结果为true
print(10>9 and 3>2 and 'egon' == 'egon' and true)
or:连接左右两个条件,两个条件成立任意一个or运算的结果为true
print(false or false or true or false or 3>10)
res=(true or (false and true)) or ((false or true) and false)
res=(true or false) or (true and false)
res=ture or false
print(res)
not
print(not 10>3)
x=None
print(not x is None)
print(x is not None)
age1=18
age2=19
print(age2 is not age1)
、、、、、、、、、、、、、、、、
name_bk='egon'
pwd-bak='123'
name=input('please input your name: ')
pwd=input('please input your password: ')
if name == name_bk and pwd == pwd_bak
print('login successful')
print('login successful')
print('login successful')
print('login successful')
print('login successful')
else:
print('username or password error')