Python list and metadata definition and use operation example, python example

Python list and metadata definition and use operation example, python example

This document describes how to define and use Python lists and metadata groups. We will share this with you for your reference. The details are as follows:

# Coding = utf8print ''' the list and element groups can be treated as normal "arrays", which can save any number of Python objects of any type. The list and element group access elements through digital indexes (starting from 0 ). Differences between lists and groups: brackets [] \ parentheses () are used for the elements in the list tuples \ lists of lists () the number of elements and the value of the elements can be changed. The number of \ elements and the value of the elements cannot be changed. The read-only list can be seen. You can use the index operator ([]) and slice operator ([:]) to obtain the subset ''' NumberList = [8.9, 0101,017, 0xab] StringList = ['hello', "hello world", '''''goddness '''] MixList = [12, 13.2, 01, 'abc ', 'Hello'] NumberTouple = (1, 3, 4, 5, 6, 7, 8.9, 0101,017, 0xab) StringTouple = ('hello', "hello world ", '''''''goddyn'') MixTouple = (12, 13.2, 01, 'abc', 'Hello ') print "output the element of the NumberList by index --------->", NumberList [0], NumberList [1], NumberList [2], numberList [-1] print "output the element of the StringList by index --------->", StringList [0], StringList [1], StringList [2], stringList [-1] print "output the element of the MixList by index --------->", MixList [0], MixList [1], MixList [2], mixList [-1] print "output the element of the NumberTouple by index --------->", NumberTouple [0], NumberTouple [1], NumberTouple [2], numberTouple [-1] print "output the element of the StringTouple by index --------->", StringTouple [0], StringTouple [1], StringTouple [2], stringTouple [-1] print "output the element of the MixTouple by index --------->", MixTouple [0], MixTouple [1], MixTouple [2], mixTouple [-1] print "output the element of the NumberList by slice --------->", NumberList [0: 2], NumberList [1: 3], NumberList [0:], NumberList [: -1] print "output the element of the StringList by slice --------->", StringList [0: 1], StringList [2: 3], StringList [0:], StringList [: -1] print "output the element of the MixList by slice --------->", MixList [0:], MixList [: 1], MixList [0: 2], MixList [2: -1] print "output the element of the NumberTouple by slice --------->", NumberTouple [0: 2], NumberTouple [1: 3], NumberTouple [2:], NumberTouple [: -1] print "output the element of the StringTouple by slice --------->", StringTouple [0: 2], StringTouple [1: 3], StringTouple [2], stringTouple [-1] print "output the element of the MixTouple by slice --------->", MixTouple [0:], MixTouple [], MixTouple [2], MixTouple [: -1] NumberList [0] = 59 # NumberTouple [0] = 56 print "Change the value of NumberList [0] to 59 ------------", numberList [0] # print "Can not change the value of NumberTouple [0] to 56 ----------", NumberTouple [0]

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For more Python-related content, refer to this topic: Python list) operation Skills summary, Python coding skills summary, Python data structure and algorithm tutorial, Python function usage skills summary, Python string operation skills summary, Python basic and advanced tutorial and Python file and directory operation tips

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