Python argparse：单值参数但允许在命令行上多次指定(Python argparse: single-valued argument but allow specified multiple times on command line)

 在python argparse ，是否可以声明一个只是单值的参数，而不是列表，但是允许多次指定，最新的一个会覆盖之前的那个？ 
 
 用例是，我正在编写一个Python程序，它从〜/ .xxxrc文件读取命令行参数，其中.xxxrc文件每行有一个命令行参数。 我想允许用户通过命令行覆盖〜/ .xxxrc文件中的值。 我的计划是在将argv传递给@~/.xxxrc之前隐式地将一个@~/.xxxrc到argv的开头，这样argparse就会读入该文件。 现在问题变成了我上面的问题。 
 
 是否有可能实现这种效果？ 如果没有，我的用例是否有任何替代解决方案。 

In python argparse, is it possible to declare an argument which is just single-valued, instead a list, but allows being specified multiple times, the latest one overrides the earlier ones?
 
The use case is, I am writing a Python program that reads command line argument from a ~/.xxxrc file, where .xxxrc file has an command line argument per line. I want to allow user override the value in ~/.xxxrc file through command line. My plan is to implicitly adds an @~/.xxxrc to the beginning of argv before passing it to argparse, so that argparse will reads in the file. Now the problem turns into my question above.
 
Is it possible to achieve this effect? If not, is there any alternative solution to my use case.

原文：https://stackoverflow.com/questions/22676037