在 Python 中，我如何声明一个动态数组 [英] In Python How can I declare a Dynamic Array

问题描述

我想声明一个数组，并且应该删除 ListBox 中存在的所有项目，而不管 ListBox 中存在的组名称如何.任何人都可以帮助我用 Python 编码.我正在使用 WINXP 操作系统 &Python 2.6.

I want to declare an Array and all items present in the ListBox Should Be deleted irrespective of the Group name present in the ListBox. can any body help me coding in Python. I am using WINXP OS & Python 2.6.

推荐答案

在 Python 中，list 是一个动态数组.您可以像这样创建一个:

In Python, a list is a dynamic array. You can create one like this:

lst = [] # Declares an empty list named lst

或者你可以用物品填充它:

Or you can fill it with items:

lst = [1,2,3]

您可以使用追加"添加项目:

You can add items using "append":

lst.append('a')

您可以使用 for 循环遍历列表的元素:

You can iterate over elements of the list using the for loop:

for item in lst:
    # Do something with item

或者，如果您想跟踪当前索引:

Or, if you'd like to keep track of the current index:

for idx, item in enumerate(lst):
    # idx is the current idx, while item is lst[idx]

要删除元素，可以使用 del 命令或 remove 函数，如下所示:

To remove elements, you can use the del command or the remove function as in:

del lst[0] # Deletes the first item
lst.remove(x) # Removes the first occurence of x in the list

但请注意，不能同时遍历列表并对其进行修改；为此，您应该迭代列表的一部分(基本上是列表的副本).如:

Note, though, that one cannot iterate over the list and modify it at the same time; to do that, you should instead iterate over a slice of the list (which is basically a copy of the list). As in:

 for item in lst[:]: # Notice the [:] which makes a slice
       # Now we can modify lst, since we are iterating over a copy of it

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