directory path types with argparse

Question

My python script needs to read files from a directory passed on the command line. I have defined a readable_dir type as below to be used with argparse for validating that th

Answer 1

If your script can't work without a valid launch_directory then it should be made a mandatory argument:

parser.add_argument('launch_directory', type=readable_dir)

btw, you should use argparse.ArgumentTypeError instead of Exception in readable_dir().