问题描述
我正在用Python 3编写一个程序，该程序将从csv文件中获取数据，对其进行调整，然后将新数据写入将由用户命名的csv文件中。
I am writing a program in Python 3 that will take data from a csv file, make adjustments to it and write the new data to a csv file that will be named by the user.
我只是想了解命令行部分。
我希望它以这种格式正确执行。
I'm just trying to understand the command line part.I want it to execute properly in this format.
$ program.py input.csv output.csv
我计划还要检查是否有3个参数。
I plan to also make it check that there are 3 total arguments.
我的问题是，在命令行上输入的文件名在哪里？
是否保存到默认变量？如何在python程序中调用这些文件名？
My question is where do this filename inputs on the command line go?Are they saved to a default variable? How can I call these filenames within my python program?
推荐答案
命令行选项存储在sys.argv中。您可能需要检查以下内容：
Command line options are stored in sys.argv. You may want to check this:
此外，如果您需要更复杂的命令行参数解析并基于此来决定程序逻辑，则应尝试
Beside, if you need more complex command-line argument parsing and deciding your program logic based on that, you should try argparse
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