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python学习笔记——列表操作
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
python学习笔记——列表操作
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