运算符

算术运算符：+、-、*、**、/、//、%

a+=b

a=a+b 

 

 

in 和 not in：判断是否包含在某个东西里面

name = "周杰伦"
if "周" in name:
    print("True")
else:
    print("False")
if "杰伦" in name:
    print("True")
else:
    print("False")
if "周杰" in name:
    print("True")
else:
    print("False")
#True
#next one is false
if "周伦" in name:
    print("True")
else:
    print("False")

name = "周杰伦"
if "周" not in name:
    print("false")
else:
    print("true")

 

 

布尔值： 真True、假False

if True:
    pass

 

v = 3 > 1
print(v)

 

==、>、<、>=、<=、!=、<>（也是不等于）、not、and、or