详解Python中的元组与逻辑运算符

概述Python元组元组是另一个数据类型，类似于List（列表）。元组用\"()\"标识。内部元素用逗号隔开。但是元素不能二次赋值，相当于只读列表。

Python元组
元组是另一个数据类型，类似于List（列表）。
元组用"()"标识。内部元素用逗号隔开。但是元素不能二次赋值，相当于只读列表。

#!/usr/bin/python# -*- Coding: UTF-8 -*-tuple = ( 'abcd',786,2.23,'john',70.2 )tinytuple = (123,'john')print tuple # 输出完整元组print tuple[0] # 输出元组的第一个元素print tuple[1:3] # 输出第二个至第三个的元素 print tuple[2:] # 输出从第三个开始至列表末尾的所有元素print tinytuple * 2 # 输出元组两次print tuple + tinytuple # 打印组合的元组

以上实例输出结果：

('abcd',70.2)abcd(786,2.23)(2.23,70.2)(123,123,'john')('abcd',70.2,'john')

以下是元组无效的，因为元组是不允许更新的。而列表是允许更新的：

#!/usr/bin/python# -*- Coding: UTF-8 -*-tuple = ( 'abcd',70.2 )List = [ 'abcd',70.2 ]tuple[2] = 1000 # 元组中是非法应用List[2] = 1000 # 列表中是合法应用

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：

以下实例演示了Python所有逻辑运算符的 *** 作：

#!/usr/bin/pythona = 10b = 20c = 0if ( 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 = 0if ( 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 trueline 2 - Either a is true or b is true or both are trueline 3 - Either a is not true or b is not trueline 4 - Either a is true or b is true or both are trueline 5 - Either a is not true or b is not true or both are not true

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