python 列表，元祖，字典

一 列表

1 列表的循环遍历

    namesList = ['xiaoWang','xiaoZhang','xiaoHua']
    for name in namesList:
        print(name)

结果

    xiaoWang
    xiaoZhang
    xiaoHua

2. 使用while循环

    namesList = ['xiaoWang','xiaoZhang','xiaoHua']
    length = len(namesList)
    i = 0
    while i<length:
        print(namesList[i])
        i+=1

3 列表添加元素("增"append, extend, insert)

 1) append 通过append可以向列表添加元素

    A = ['xiaoWang','xiaoZhang','xiaoHua']
    temp = "zjf"
    A.append(temp)

2) extend 通过extend可以将另一个集合中的元素逐一添加到列表中

>>> a = [1, 2]
>>> b = [3, 4]
>>> a.append(b)
>>> a
[1, 2, [3, 4]]
>>> a.extend(b)
>>> a
[1, 2, [3, 4], 3, 4]

3) insert insert(index, object) 在指定位置index前插入元素object

>>> a = [0, 1, 2]
>>> a.insert(1, 3)
>>> a
[0, 3, 1, 2]

4)index, count

index和count与字符串中的用法相同