Python-运算符

什么是运算符？

本章节主要说明Python的运算符。举个简单的例子 4 +5 = 9 。 例子中，4 和 5 被称为操作数，"+" 称为运算符。

Python语言支持以下类型的运算符:

• 算术运算符

• 比较（关系）运算符

• 赋值运算符

• 逻辑运算符

• 位运算符

• 成员运算符

• 身份运算符

• 运算符优先级

  ---

1.算术运算符

a = 10
b = 3

c = a + b     #加法
d = a - b     #减法
e = a * b     #乘法
f = a / b     #除法
g = a % b     #取模
h = a ** b    #幂运算
i = a // b    #整除 返回商的整数部分
print(c,d,e,f,g,h,i) # 13 7 30 3.3333333333333335 1 1000

---

2.比较运算符

a = 10
b = 3

d = a == b
e = a != b
f = a > b
g = a < b
h = a >= b
i = a <= b

print(d,e,f,g,h,i) # False True True False True False

3.赋值运算符

a = 10
b = 3

c = a
d = b
print(c,d)        # 10,3

a = 10
b = 3
a += a
print(a)         # 20

a = 10
b = 3
b -= a
print(b)        #-7

a = 10
b = 3
a *= b
print(a)       #30

a = 10
b = 3
b /= a
print(b)      #0.3

a = 10
b = 3
b %= a
print(b)     #3

a = 10
b = 3
b **= a
print(b)    #59049

a = 10
b = 3
a //= b
print(b)    #3

---

4.位运算符

a = 11         # 1011
b = 5          # 0101

c = a & b
d = a | b
e = a ^ b
f = ~ a
g = a << 1
h = b >> 1
print(c,d,e,f,g,h)    # 1 15 14 -12 22 2

---

5.逻辑运算符

a = 20
b = 10
c = 0

k = a and b
d = a and c
e = c and b
f = a or b
g = a or c
h = c or b
i = not a
j = not c
print(k,d,e,f,g,h,i,j)    #10 0 0 20 20 10 False True

---

6.成员运算符

 

a = 1
b = 20
list = [1, 2, 3, 4, 5 ]

if a in list:
    print("a在list里")
else:
    print("a不在list里")

if b in list:
    print("b在list里")
else:
    print("b不在list里")

7.身份运算符

a = 1
b = 20

if a is b:
    print("a和b的地址相同")
else:
    print("a和b的地址不相同")

a = 20
if a is b:
    print("a和b的地址相同")
else:
    print("a和b的地址不相同")

8.运算符优先级