在python中调试argpars [英] debugging argpars in python

问题描述

我可以知道调试 argpars 函数的最佳做法是什么吗.

May I know what is the best practice to debug an argpars function.

假设我有一个包含以下几行的 py 文件 test_file.py

Say I have a py file test_file.py with the following lines

# Script start
import argparse
import os
parser = argparse.ArgumentParser()
parser.add_argument("–output_dir", type=str, default="/data/xx")
args = parser.parse_args()
os.makedirs(args.output_dir)
# Script stop

上面的脚本可以通过以下方式从终端执行:

The above script can be executed from terminal by:

python test_file.py –output_dir data/xx

但是，对于调试过程，我想避免使用终端.因此解决方法是

However, for debugging process, I would like to avoid using terminal. Thus the workaround would be

# other line were commented for debugging process
# Thus, active line are
# Script start
import os
args = {"output_dir":"data/xx"}
os.makedirs(args.output_dir)
#Script stop

但是，我无法执行修改后的脚本.我可以知道我错过了什么吗?

However, I am unable to execute the modified script. May I know what have I miss?

推荐答案

当用作脚本时，parse_args 会产生一个 Namespace 对象，显示为:>

When used as a script, parse_args will produce a Namespace object, which displays as:

argparse.Namespace(output_dir='data/xx')

然后

args.output_dir

将是该属性的值

在测试中，您可以做几件事:

In the test you could do one several things:

args = parser.parse_args([....])  # a 'fake' sys.argv[1:] list

args = argparse.Namespace(output_dir= 'mydata')

并像以前一样使用 args.或者干脆调用

and use args as before. Or simply call the

os.makedirs('data/xx')

我建议将脚本组织为:

# Script start
import argparse
import os
# this parser definition could be in a function
parser = argparse.ArgumentParser()
parser.add_argument("–output_dir", type=str, default="/data/xx")

def main(args):
    os.makedirs(args.output_dir)

if __name__=='__main__':
    args = parser.parse_args()
    main(args)

这样在导入文件时 parse_args 步骤就不会运行.无论您是将 args Namespace 传递给 main 还是传递诸如 args.output_dir 或字典等值.是你的选择.

That way the parse_args step isn't run when the file is imported. Whether you pass the args Namespace to main or pass values like args.output_dir, or a dictionary, etc. is your choice.

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