Python语言支持以下类型的运算符：
- l 算术运算符
- l 比较运算符
- l 赋值运算符
- l 逻辑运算符
- l 位运算符
- l 成员运算符
- l 身份运算符
- l 运算符优先级
Python算术运算符
/*** arithmetic.py ***/ a = 21 b = 10 c = 0 c = a + b print "1 - c is : ", c c = a - b print "2 - c is : ", c c = a * b print "3 - c is : ", c c = a / b print "4 - c is : ", c c = a % b print "5 - c is : ", c #change the value of a,b,c a = 2 b = 3 c = a ** b print "6 - c is : ", c a = 10 b = 5 c = a // b print "7 - c is : ", c
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ vim arithmetic.py
robot@ubuntu:~/wangqinghe/python/20190821$ python arithmetic.py
1 - c is : 31
2 - c is : 11
3 - c is : 210
4 - c is : 2
5 - c is : 1
6 - c is : 8
7 - c is : 2
注意：在python2.x里，整数除以整数，只能的到整数，如果想要得到小数部分，把其中一个数改为浮点数即可
/*** inter.py ***/ print 1/2 print 1.0/2 print 1/float(2)
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ vim inter.py
robot@ubuntu:~/wangqinghe/python/20190821$ python inter.py
0
0.5
0.5
Python比较运算符
/***
comparsion.py
****/
a = 21
b = 10
c = 0
if a == b :
print "a == b"
else:
print "a no == b"
if a != b :
print "a != b"
else:
print "a no != b"
if a <> b :
print "a <> b"
else :
print "a no <> b"
if a < b :
print "a < b"
else :
print "a no < b"
if a > b :
print "a > b"
else :
print "a no > b"
a = 5
b = 20
if a <= b :
print "a <= b"
else :
print "a no <= b"
if b >= a :
print "b <= a"
else :
print "b no <= a"
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python comparsion.py
a no == b
a != b
a <> b
a no < b
a > b
a <= b
b <= a
Python赋值运算符：
/*** assignment.py ***/ a = 21 b = 10 c = 0 c = a + b print "a + b = " , c c += a print "a + b = " , c c *= a print "a + b = " , c c /= a print "a + b = " , c c = 2 c %= a print "a + b = " , c c ** a print "a + b = " , c c //= a print "a + b = " , c
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python assignment.py
a + b = 31
a + b = 52
a + b = 1092
a + b = 52
a + b = 2
a + b = 2
a + b = 0
Python位运算符
Python逻辑运算符
按位运算符把数字看作二进制进行计算的。python中按位运算法则如下：
/*** bit.py ***/ a = 60 b = 13 print a,b print a & b print a | b print a ^ b print ~a print a << 2 print b >> 2
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python bit.py
60 13
12
61
49
-61
240
3
Python逻辑运算符
/***
bool.py
***/
a = 10
b = 20
if a and b :
print "a and b is true"
else :
print "a and b is not true"
if a or b :
print "a or b is true"
else :
print "a or b not true"
a = 0
if a and b :
print "a and b is true"
else :
print "a and b is not true"
if a or b :
print "a or b is true"
else :
print "a or b not true"
if not(a and b) :
print "a and b all true"
else :
print "a and b not all true"
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python bool.py
a and b is true
a or b is true
a and b is not true
a or b is true
a and b all true
Python成员运算符
/***
member.py
***/
a = 10
b = 20
list = [1,2,3,4,5];
if ( a in list ) :
print "a in list"
else :
print "b not in list"
if(b not in list):
print "b not in list"
else :
print "b on list"
a = 2
if ( a in list ) :
print "a in list"
else :
print "b not in list"
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python member.py
b not in list
b not in list
a in list
Python身份运算符：
身份运算符用于比较两个对象的存储单元
注：id()函数用于获取对象内存地址
/***
id.py
***/
a = 20
b = 20
if( a is b):
print "a and b are equal id"
else:
print "a and b are not equal id"
if ( a is not b):
print "a is not b"
else:
print "a is b"
b = 30
if( a is b):
print "a and b are equal id"
else:
print "a and b are not equal id"
if ( a is not b):
print "a is not b"
else:
print "a is b"
运行结果：
robot@ubuntu:~/wangqinghe/python/20190821$ python id.py
a and b are equal id
a is b
a and b are not equal id
a is not b
is 和 == 的区别：
is是用于判断两个变量引用对象是否是同一个（同一块内存空间），==用于判断引用变量的值是否相同。
Python运算符优先级
|
运算符 |
描述 |
|
** |
指数（最高优先级） |
|
~、+、 |
按位反转、一元加号、和减号(最后两个的方法名位+@和-@) |
|
*/%// |
乘、除、取模、取整除 |
|
+- |
加法减法 |
|
>> << |
右移、左移 |
|
& |
与运算 |
|
^| |
异或、或 |
|
<= 、 <、> 、 >= |
比较运算符 |
|
<> 、 == 、 ！= |
等于运算符 |
|
= %= /= //= -= += *= **= |
赋值运算符 |
|
is is not |
身份运算符 |
|
in not in |
成员运算符 |
|
not and or |
逻辑运算符 |