python入门(三)
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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。
1.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yb / 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/python
a = 21
b = 10
c = 0
c = a + b
print "Line 1 - Value of c is ", c
c = a - b
print "Line 2 - Value of c is ", c
c = a * b
print "Line 3 - Value of c is ", c
c = a / b
print "Line 4 - Value of c is ", c
c = a % b
print "Line 5 - Value of c is ", c
a = 2
b = 3
c = a**b
print "Line 6 - Value of c is ", c
a = 10
b = 5
c = 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 31
Line 2 - Value of c is 11
Line 3 - Value of c is 210
Line 4 - Value of c is 2
Line 5 - Value of c is 1
Line 6 - Value of c is 8
Line 7 - Value of c is 2
2.Python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。
< 小于 - 返回x是否小于y。所有比较运算符返回1表示真,返回0表示假。这分别与特殊的变量True和False等价。注意,这些变量名的大写。(a < b) 返回 true。
>= 大于等于 - 返回x是否大于等于y。 (a >= b) 返回 False。
<= 小于等于 -返回x是否小于等于y。 (a <= b) 返回 true。
以下实例演示了Python所有比较运算符的操作:
#!/usr/bin/python
a = 21
b = 10
c = 0
if ( a == b ):
print "Line 1 - a is equal to b"
else:
print "Line 1 - a is not equal to b"
if ( a != b ):
print "Line 2 - a is not equal to b"
else:
print "Line 2 - a is equal to b"
if ( a <> 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"
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 <= b ):
print "Line 6 - a is either less than or equal to b"
else:
print "Line 6 - a is neither less than nor equal to b"
if ( b >= 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
3.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:
#!/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
4.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:
下表中变量 a 为 60,b 为 13。
运算符 描述 实例
& 按位与运算符:参与运算的两个值,如果两个相应位都为1,则该位的结果为1,否则为0(a & b) 输出结果 12 ,二进制解释: 0000 1100
| 按位或运算符:只要对应的二个二进位有一个为1时,结果位就为1。(a | b) 输出结果 61 ,二进制解释: 0011 1101
^ 按位异或运算符:当两对应的二进位相异时,结果为1(a ^ b) 输出结果 49 ,二进制解释: 0011 0001
~ 按位取反运算符:对数据的每个二进制位取反,即把1变为0,把0变为1(~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。
<< 左移动运算符:运算数的各二进位全部左移若干位,由"<<"右边的数指定移动的位数,高位丢弃,低位补0。a << 2 输出结果 240 ,二进制解释: 1111 0000
>> 右移动运算符:把">>"左边的运算数的各二进位全部右移若干位,">>"右边的数指定移动的位数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; # 240 = 1111 0000
print "Line 5 - 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
Line 4 - Value of c is -61
Line 5 - Value of c is 240
Line 6 - Value of c is 15
5.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。
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
6.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。
以下实例演示了Python所有成员运算符的操作:
#!/usr/bin/python
a = 10
b = 20
list = [1, 2, 3, 4, 5 ];
if ( a in list ):
print "Line 1 - a is available in the given list"
else:
print "Line 1 - a is not available in the given list"
if ( b not in list ):
print "Line 2 - b is not available in the given list"
else:
print "Line 2 - b is available in the given list"
a = 2
if ( a in list ):
print "Line 3 - a is available in the given list"
else:
print "Line 3 - a is not available in the given list"
以上实例输出结果:
Line 1 - a is not available in the given list
Line 2 - b is not available in the given list
Line 3 - a is available in the given list
7.Python身份运算符
身份运算符用于比较两个对象的存储单元
运算符 描述 实例
is is是判断两个标识符是不是引用自一个对象x is y, 如果 id(x) 等于 id(y) , is 返回结果 1
is not is not是判断两个标识符是不是引用自不同对象x is not y, 如果 id(x) 不等于 id(y). is not 返回结果 1
以下实例演示了Python所有身份运算符的操作:
#!/usr/bin/python
a = 20
b = 20
if ( a is b ):
print "Line 1 - a and b have same identity"
else:
print "Line 1 - a and b do not have same identity"
if ( id(a) == id(b) ):
print "Line 2 - a and b have same identity"
else:
print "Line 2 - a and b do not have same identity"
b = 30
if ( a is b ):
print "Line 3 - a and b have same identity"
else:
print "Line 3 - a and b do not have same identity"
if ( a is not b ):
print "Line 4 - a and b do not have same identity"
else:
print "Line 4 - a and b have same identity"
以上实例输出结果:
Line 1 - a and b have same identity
Line 2 - a and b have same identity
Line 3 - a and b do not have same identity
Line 4 - a and b do not have same identity
8.Python运算符优先级
以下表格列出了从最高到最低优先级的所有运算符:
运算符 描述
** 指数 (最高优先级)
~ + - 按位翻转, 一元加号和减号 (最后两个的方法名为 +@ 和 -@)
* / % // 乘,除,取模和取整除
+ - 加法减法
>> << 右移,左移运算符
& 位 'AND'
^ | 位运算符
<= < > >= 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 or and 逻辑运算符
以下实例演示了Python所有运算符优先级的操作:
#!/usr/bin/python
a = 20
b = 10
c = 15
d = 5
e = 0
e = (a + b) * c / d #( 30 * 15 ) / 5
print "Value of (a + b) * c / d is ", e
e = ((a + b) * c) / d # (30 * 15 ) / 5
print "Value of ((a + b) * c) / d is ", e
e = (a + b) * (c / d); # (30) * (15/5)
print "Value of (a + b) * (c / d) is ", e
e = a + (b * c) / d; # 20 + (150/5)
print "Value of a + (b * c) / d is ", e
以上实例输出结果:
Value of (a + b) * c / d is 90
Value of ((a + b) * c) / d is 90
Value of (a + b) * (c / d) is 90
Value of a + (b * c) / d is 50
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。
1.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yb / 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/python
a = 21
b = 10
c = 0
c = a + b
print "Line 1 - Value of c is ", c
c = a - b
print "Line 2 - Value of c is ", c
c = a * b
print "Line 3 - Value of c is ", c
c = a / b
print "Line 4 - Value of c is ", c
c = a % b
print "Line 5 - Value of c is ", c
a = 2
b = 3
c = a**b
print "Line 6 - Value of c is ", c
a = 10
b = 5
c = 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 31
Line 2 - Value of c is 11
Line 3 - Value of c is 210
Line 4 - Value of c is 2
Line 5 - Value of c is 1
Line 6 - Value of c is 8
Line 7 - Value of c is 2
2.Python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。
< 小于 - 返回x是否小于y。所有比较运算符返回1表示真,返回0表示假。这分别与特殊的变量True和False等价。注意,这些变量名的大写。(a < b) 返回 true。
>= 大于等于 - 返回x是否大于等于y。 (a >= b) 返回 False。
<= 小于等于 -返回x是否小于等于y。 (a <= b) 返回 true。
以下实例演示了Python所有比较运算符的操作:
#!/usr/bin/python
a = 21
b = 10
c = 0
if ( a == b ):
print "Line 1 - a is equal to b"
else:
print "Line 1 - a is not equal to b"
if ( a != b ):
print "Line 2 - a is not equal to b"
else:
print "Line 2 - a is equal to b"
if ( a <> 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"
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 <= b ):
print "Line 6 - a is either less than or equal to b"
else:
print "Line 6 - a is neither less than nor equal to b"
if ( b >= 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
3.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:
#!/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
4.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:
下表中变量 a 为 60,b 为 13。
运算符 描述 实例
& 按位与运算符:参与运算的两个值,如果两个相应位都为1,则该位的结果为1,否则为0(a & b) 输出结果 12 ,二进制解释: 0000 1100
| 按位或运算符:只要对应的二个二进位有一个为1时,结果位就为1。(a | b) 输出结果 61 ,二进制解释: 0011 1101
^ 按位异或运算符:当两对应的二进位相异时,结果为1(a ^ b) 输出结果 49 ,二进制解释: 0011 0001
~ 按位取反运算符:对数据的每个二进制位取反,即把1变为0,把0变为1(~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。
<< 左移动运算符:运算数的各二进位全部左移若干位,由"<<"右边的数指定移动的位数,高位丢弃,低位补0。a << 2 输出结果 240 ,二进制解释: 1111 0000
>> 右移动运算符:把">>"左边的运算数的各二进位全部右移若干位,">>"右边的数指定移动的位数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; # 240 = 1111 0000
print "Line 5 - 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
Line 4 - Value of c is -61
Line 5 - Value of c is 240
Line 6 - Value of c is 15
5.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。
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
6.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。
以下实例演示了Python所有成员运算符的操作:
#!/usr/bin/python
a = 10
b = 20
list = [1, 2, 3, 4, 5 ];
if ( a in list ):
print "Line 1 - a is available in the given list"
else:
print "Line 1 - a is not available in the given list"
if ( b not in list ):
print "Line 2 - b is not available in the given list"
else:
print "Line 2 - b is available in the given list"
a = 2
if ( a in list ):
print "Line 3 - a is available in the given list"
else:
print "Line 3 - a is not available in the given list"
以上实例输出结果:
Line 1 - a is not available in the given list
Line 2 - b is not available in the given list
Line 3 - a is available in the given list
7.Python身份运算符
身份运算符用于比较两个对象的存储单元
运算符 描述 实例
is is是判断两个标识符是不是引用自一个对象x is y, 如果 id(x) 等于 id(y) , is 返回结果 1
is not is not是判断两个标识符是不是引用自不同对象x is not y, 如果 id(x) 不等于 id(y). is not 返回结果 1
以下实例演示了Python所有身份运算符的操作:
#!/usr/bin/python
a = 20
b = 20
if ( a is b ):
print "Line 1 - a and b have same identity"
else:
print "Line 1 - a and b do not have same identity"
if ( id(a) == id(b) ):
print "Line 2 - a and b have same identity"
else:
print "Line 2 - a and b do not have same identity"
b = 30
if ( a is b ):
print "Line 3 - a and b have same identity"
else:
print "Line 3 - a and b do not have same identity"
if ( a is not b ):
print "Line 4 - a and b do not have same identity"
else:
print "Line 4 - a and b have same identity"
以上实例输出结果:
Line 1 - a and b have same identity
Line 2 - a and b have same identity
Line 3 - a and b do not have same identity
Line 4 - a and b do not have same identity
8.Python运算符优先级
以下表格列出了从最高到最低优先级的所有运算符:
运算符 描述
** 指数 (最高优先级)
~ + - 按位翻转, 一元加号和减号 (最后两个的方法名为 +@ 和 -@)
* / % // 乘,除,取模和取整除
+ - 加法减法
>> << 右移,左移运算符
& 位 'AND'
^ | 位运算符
<= < > >= 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 or and 逻辑运算符
以下实例演示了Python所有运算符优先级的操作:
#!/usr/bin/python
a = 20
b = 10
c = 15
d = 5
e = 0
e = (a + b) * c / d #( 30 * 15 ) / 5
print "Value of (a + b) * c / d is ", e
e = ((a + b) * c) / d # (30 * 15 ) / 5
print "Value of ((a + b) * c) / d is ", e
e = (a + b) * (c / d); # (30) * (15/5)
print "Value of (a + b) * (c / d) is ", e
e = a + (b * c) / d; # 20 + (150/5)
print "Value of a + (b * c) / d is ", e
以上实例输出结果:
Value of (a + b) * c / d is 90
Value of ((a + b) * c) / d is 90
Value of (a + b) * (c / d) is 90
Value of a + (b * c) / d is 50
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