python introductory tutorial list operations-Python Tutorial-php.cn

python introductory tutorial list operations

巴扎黑

Release： 2017-07-21 16:49:05

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python list operation - add

append: Append a piece of data to the end of the list

name = ["Zhangsan","XiongDa","Lisi"]
name.append("wangwu")print name
输出结果：
['Zhangsan', 'XiongDa', 'Lisi', 'wangwu']

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insert: Insert a piece of data at the specified position

name = ["Zhangsan","XiongDa","Lisi"]
name.insert(1,"wangwu")    #在下标为1的位置插入一条数据“wangwu”print name
输出结果：
['Zhangsan', 'wangwu', 'XiongDa', 'Lisi']

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pythonList operation - delete

name = ["Zhangsan","XiongDa","Lisi"]
name.remove("Lisi")    #删除指定的数据print name
输出结果：
['Zhangsan', 'XiongDa']

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name = ["Zhangsan","XiongDa","Lisi"]del name[0]    #删掉下标为0的一条数据print name
输出结果：
['XiongDa', 'Lisi']

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name = ["Zhangsan","XiongDa","Lisi"]
name.pop()    #删除最后一条数据print name
输出结果：
['Zhangsan', 'XiongDa']

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If parameters are brought into pop(), the effect will be the same In del

Name.pop(1) == del name[1]

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##pythonList operations—— Change

name = ["Zhangsan","XiongDa","Lisi"]
name[1] = "wangwu"print name
输出结果：
['Zhangsan', 'wangwu', 'Lisi']

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##pythonList operation - check

name = ["Zhangsan","XiongDa","Lisi","wangwu"]print(name[1])     #直接取出下标为1的数据输出结果：
XiongDa

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name = ["Zhangsan","XiongDa","Lisi","wangwu"]print(name[0:2])   #取出从下标0到下标1的数据，不包括2（顾头不顾尾）输出结果：
['Zhangsan', 'XiongDa']

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When the subscript is a negative number, start from the right

name = ["Zhangsan","XiongDa","Lisi","wangwu"]print(name[-1])     #直接取出下标为1的数据输出结果：
wangwu

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name = ["Zhangsan","XiongDa","Lisi","wangwu"]print(name[-3:-1])   #从倒数第三个开始取，取到倒数第二个，因为不包括-1输出结果：
['XiongDa', 'Lisi']

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name = ["Zhangsan","XiongDa","Lisi","wangwu"]print(name[-3:])   #从倒数第三个开始取，取到倒数第一个输出结果：
['XiongDa', 'Lisi', 'wangwu']
同理从昨天开始取时
name[0:3] == name[:3]

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List of other operations:

name = ["Zhangsan","XiongDa","Lisi","wangwu","Lisi"]
name.count("Lisi")  #统计Lisi出现的次数name.clear()         #清空数据name.reverse()       #反转列表name.sort()           正向排序
name2 = ["1","2"]
name.extend(name2)  #两个数组合并，name2放在后面

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