【小白教程】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，"+"号为运算符。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接下来让我们一个个来学习Python的运算符。Python算术运算符以下假设变量a为10，变量b为20：运算符 描述 实例+ 加 - 两个对象相加 a + b 输出结果 30- 减 - 得到负数或是一个数减去另一个数 a - b 输出结果 -10* 乘 - 两个数相乘或是返回一个被重复若干次的字符串 a * b 输出结果 200/ 除 - x除以y b / a 输出结果 2% 取模 - 返回除法的余数 b % a 输出结果 0** 幂 - 返回x的y次幂 a**b 为10的20次方， 输出结果 100000000000000000000// 取整除 - 返回商的整数部分 9//2 输出结果 4 , 9.0//2.0 输出结果 4.0以下实例演示了Python所有算术运算符的操作：#!/usr/bin/pythona = 21b = 10c = 0c = a + bprint "Line 1 - Value of c is ", cc = a - bprint "Line 2 - Value of c is ", c c = a * bprint "Line 3 - Value of c is ", c c = a / bprint "Line 4 - Value of c is ", c c = a % bprint "Line 5 - Value of c is ", ca = 2b = 3c = a**b print "Line 6 - Value of c is ", ca = 10b = 5c = a//b print "Line 7 - Value of c is ", c尝试一下 »以上实例输出结果：Line 1 - Value of c is 31Line 2 - Value of c is 11Line 3 - Value of c is 210Line 4 - Value of c is 2Line 5 - Value of c is 1Line 6 - Value of c is 8Line 7 - Value of c is 2Python比较运算符以下假设变量a为10，变量b为20：运算符 描述 实例== 等于 - 比较对象是否相等 (a == b) 返回 False。!= 不等于 - 比较两个对象是否不相等 (a != b) 返回 true.> 不等于 - 比较两个对象是否不相等 (a > b) 返回 true。这个运算符类似 != 。> 大于 - 返回x是否大于y (a > b) 返回 False。= 大于等于 - 返回x是否大于等于y。 (a >= b) 返回 False。 b ): print "Line 3 - a is not equal to b"else: print "Line 3 - a is equal to b"if ( a b ): print "Line 4 - a is less than b" else: print "Line 4 - a is not less than b"搬自网络，侵权立删。
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最后回复于2019-12-23
if ( a > b ):
print "Line 5 - a is greater than b"
else:
print "Line 5 - a is not greater than b"
a = 5;
b = 20;
if ( a = a ):
print "Line 7 - b is either greater than or equal to b"
else:
print "Line 7 - b is neither greater than nor equal to b"
以上实例输出结果：
Line 1 - a is not equal to b
Line 2 - a is not equal to b
Line 3 - a is not equal to b
Line 4 - a is not less than b
Line 5 - a is greater than b
Line 6 - a is either less than or equal to b
Line 7 - b is either greater than or equal to b
Python赋值运算符
以下假设变量a为10，变量b为20：
运算符 描述 实例
= 简单的赋值运算符 c = a + b 将 a + b 的运算结果赋值为 c
+= 加法赋值运算符 c += a 等效于 c = c + a
-= 减法赋值运算符 c -= a 等效于 c = c - a
*= 乘法赋值运算符 c *= a 等效于 c = c * a
/= 除法赋值运算符 c /= a 等效于 c = c / a
%= 取模赋值运算符 c %= a 等效于 c = c % a
**= 幂赋值运算符 c **= a 等效于 c = c ** a
//= 取整除赋值运算符 c //= a 等效于 c = c // a
以下实例演示了Python所有赋值运算符的操作：
print "Line 5 - a is greater than b"
else:
print "Line 5 - a is not greater than b"
a = 5;
b = 20;
if ( a = a ):
print "Line 7 - b is either greater than or equal to b"
else:
print "Line 7 - b is neither greater than nor equal to b"
以上实例输出结果：
Line 1 - a is not equal to b
Line 2 - a is not equal to b
Line 3 - a is not equal to b
Line 4 - a is not less than b
Line 5 - a is greater than b
Line 6 - a is either less than or equal to b
Line 7 - b is either greater than or equal to b
Python赋值运算符
以下假设变量a为10，变量b为20：
运算符 描述 实例
= 简单的赋值运算符 c = a + b 将 a + b 的运算结果赋值为 c
+= 加法赋值运算符 c += a 等效于 c = c + a
-= 减法赋值运算符 c -= a 等效于 c = c - a
*= 乘法赋值运算符 c *= a 等效于 c = c * a
/= 除法赋值运算符 c /= a 等效于 c = c / a
%= 取模赋值运算符 c %= a 等效于 c = c % a
**= 幂赋值运算符 c **= a 等效于 c = c ** a
//= 取整除赋值运算符 c //= a 等效于 c = c // a
以下实例演示了Python所有赋值运算符的操作：
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#!/usr/bin/python
a = 21
b = 10
c = 0
c = a + b
print "Line 1 - Value of c is ", c
c += a
print "Line 2 - Value of c is ", c
c *= a
print "Line 3 - Value of c is ", c
c /= a
print "Line 4 - Value of c is ", c
c = 2
c %= a
print "Line 5 - Value of c is ", c
c **= a
print "Line 6 - Value of c is ", c
c //= a
print "Line 7 - Value of c is ", c
以上实例输出结果：
Line 1 - Value of c is 31
Line 2 - Value of c is 52
Line 3 - Value of c is 1092
Line 4 - Value of c is 52
Line 5 - Value of c is 2
Line 6 - Value of c is 2097152
Line 7 - Value of c is 99864
a = 21
b = 10
c = 0
c = a + b
print "Line 1 - Value of c is ", c
c += a
print "Line 2 - Value of c is ", c
c *= a
print "Line 3 - Value of c is ", c
c /= a
print "Line 4 - Value of c is ", c
c = 2
c %= a
print "Line 5 - Value of c is ", c
c **= a
print "Line 6 - Value of c is ", c
c //= a
print "Line 7 - Value of c is ", c
以上实例输出结果：
Line 1 - Value of c is 31
Line 2 - Value of c is 52
Line 3 - Value of c is 1092
Line 4 - Value of c is 52
Line 5 - Value of c is 2
Line 6 - Value of c is 2097152
Line 7 - Value of c is 99864
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楼下这些代码，干嘛的
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Python位运算符
按位运算符是把数字看作二进制来进行计算的。Python中的按位运算法则如下：
运算符 描述 实例
& 按位与运算符 (a & b) 输出结果 12 ，二进制解释： 0000 1100
| 按位或运算符 (a | b) 输出结果 61 ，二进制解释： 0011 1101
^ 按位异或运算符 (a ^ b) 输出结果 49 ，二进制解释： 0011 0001
~ 按位取反运算符 (~a ) 输出结果 -61 ，二进制解释： 1100 0011， 在一个有符号二进制数的补码形式。
> 右移动运算符 a >> 2 输出结果 15 ，二进制解释： 0000 1111
以下实例演示了Python所有位运算符的操作：
#!/usr/bin/python
a = 60 # 60 = 0011 1100
b = 13 # 13 = 0000 1101
c = 0
c = a & b; # 12 = 0000 1100
print "Line 1 - Value of c is ", c
c = a | b; # 61 = 0011 1101
print "Line 2 - Value of c is ", c
c = a ^ b; # 49 = 0011 0001
print "Line 3 - Value of c is ", c
c = ~a; # -61 = 1100 0011
print "Line 4 - Value of c is ", c
c = a > 2; # 15 = 0000 1111
print "Line 6 - Value of c is ", c
以上实例输出结果：
Line 1 - Value of c is 12
Line 2 - Value of c is 61
Line 3 - Value of c is 49
按位运算符是把数字看作二进制来进行计算的。Python中的按位运算法则如下：
运算符 描述 实例
& 按位与运算符 (a & b) 输出结果 12 ，二进制解释： 0000 1100
| 按位或运算符 (a | b) 输出结果 61 ，二进制解释： 0011 1101
^ 按位异或运算符 (a ^ b) 输出结果 49 ，二进制解释： 0011 0001
~ 按位取反运算符 (~a ) 输出结果 -61 ，二进制解释： 1100 0011， 在一个有符号二进制数的补码形式。
> 右移动运算符 a >> 2 输出结果 15 ，二进制解释： 0000 1111
以下实例演示了Python所有位运算符的操作：
#!/usr/bin/python
a = 60 # 60 = 0011 1100
b = 13 # 13 = 0000 1101
c = 0
c = a & b; # 12 = 0000 1100
print "Line 1 - Value of c is ", c
c = a | b; # 61 = 0011 1101
print "Line 2 - Value of c is ", c
c = a ^ b; # 49 = 0011 0001
print "Line 3 - Value of c is ", c
c = ~a; # -61 = 1100 0011
print "Line 4 - Value of c is ", c
c = a > 2; # 15 = 0000 1111
print "Line 6 - Value of c is ", c
以上实例输出结果：
Line 1 - Value of c is 12
Line 2 - Value of c is 61
Line 3 - Value of c is 49
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Line 4 - Value of c is -61
Line 5 - Value of c is 240
Line 6 - Value of c is 15
Line 5 - Value of c is 240
Line 6 - Value of c is 15
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Python逻辑运算符
Python语言支持逻辑运算符，以下假设变量a为10，变量b为20：
运算符 描述 实例
and 布尔"与" - 如果x为False，x and y返回False，否则它返回y的计算值。 (a and b) 返回 true。
or 布尔"或" - 如果x是True，它返回True，否则它返回y的计算值。 (a or b) 返回 true。
not 布尔"非" - 如果x为True，返回False。如果x为False，它返回True。 not(a and b) 返回 false。
Python语言支持逻辑运算符，以下假设变量a为10，变量b为20：
运算符 描述 实例
and 布尔"与" - 如果x为False，x and y返回False，否则它返回y的计算值。 (a and b) 返回 true。
or 布尔"或" - 如果x是True，它返回True，否则它返回y的计算值。 (a or b) 返回 true。
not 布尔"非" - 如果x为True，返回False。如果x为False，它返回True。 not(a and b) 返回 false。
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运算符是咋个回事
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要说的太多放到帖子里面来，代码是举例用的。
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以下实例演示了Python所有逻辑运算符的操作：
#!/usr/bin/python
a = 10
b = 20
c = 0
if ( a and b ):
print "Line 1 - a and b are true"
else:
print "Line 1 - Either a is not true or b is not true"
if ( a or b ):
print "Line 2 - Either a is true or b is true or both are true"
else:
print "Line 2 - Neither a is true nor b is true"
a = 0
if ( a and b ):
print "Line 3 - a and b are true"
else:
print "Line 3 - Either a is not true or b is not true"
if ( a or b ):
print "Line 4 - Either a is true or b is true or both are true"
else:
print "Line 4 - Neither a is true nor b is true"
if not( a and b ):
print "Line 5 - Either a is not true or b is not true or both are not true"
else:
print "Line 5 - a and b are true"
以上实例输出结果：
Line 1 - a and b are true
Line 2 - Either a is true or b is true or both are true
Line 3 - Either a is not true or b is not true
Line 4 - Either a is true or b is true or both are true
Line 5 - Either a is not true or b is not true or both are not true
#!/usr/bin/python
a = 10
b = 20
c = 0
if ( a and b ):
print "Line 1 - a and b are true"
else:
print "Line 1 - Either a is not true or b is not true"
if ( a or b ):
print "Line 2 - Either a is true or b is true or both are true"
else:
print "Line 2 - Neither a is true nor b is true"
a = 0
if ( a and b ):
print "Line 3 - a and b are true"
else:
print "Line 3 - Either a is not true or b is not true"
if ( a or b ):
print "Line 4 - Either a is true or b is true or both are true"
else:
print "Line 4 - Neither a is true nor b is true"
if not( a and b ):
print "Line 5 - Either a is not true or b is not true or both are not true"
else:
print "Line 5 - a and b are true"
以上实例输出结果：
Line 1 - a and b are true
Line 2 - Either a is true or b is true or both are true
Line 3 - Either a is not true or b is not true
Line 4 - Either a is true or b is true or both are true
Line 5 - Either a is not true or b is not true or both are not true
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Python成员运算符
除了以上的一些运算符之外，Python还支持成员运算符，测试实例中包含了一系列的成员，包括字符串，列表或元组。
运算符 描述 实例
in 如果在指定的序列中找到值返回True，否则返回False。 x 在 y序列中 , 如果x在y序列中返回True。
not in 如果在指定的序列中没有找到值返回True，否则返回False。 x 不在 y序列中 , 如果x不在y序列中返回True。
除了以上的一些运算符之外，Python还支持成员运算符，测试实例中包含了一系列的成员，包括字符串，列表或元组。
运算符 描述 实例
in 如果在指定的序列中找到值返回True，否则返回False。 x 在 y序列中 , 如果x在y序列中返回True。
not in 如果在指定的序列中没有找到值返回True，否则返回False。 x 不在 y序列中 , 如果x不在y序列中返回True。
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