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python入门教程之列表操作

时间:2021-07-01 10:21:17 帮助过:58人阅读

python列表操作——增

append:追加一条数据到列表的最后

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


insert:指定位置插入一条数据

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']



python列表操作——删

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



如果当pop()中带入了参数,其效果等同于del

Name.pop(1) == del name[1]



python列表操作——改

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



python列表操作——查

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



当下标为负数时,则从右边开始取

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



列表其他操作:

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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