argparse

问题 I'm trying to create a fully customized "help" usage with Python (which I plan to import into many programs that I want to have style consistency) but am having some trouble. I don't know why my description is ignoring newlines... tried "" and '', I can't get the ":" to occur after a /newline for the "...ARGS" lines, and obviously they look weird sitting on their own lines, and I have no idea how to add the newline at the end. Help please?? Here's a sample of what I am getting right now:

问题 Assume that I am expecting a list of lists where the inner lists have different types and lengths, e. g., [[1, 2], ["foo", "bar"], [3.14, "baz", 20]] how can I parse the above list using argparse? Most useful questions on stackoverflow: Similar questions exist, where most useful one is here. But they are not good enough in my case as they ignore the fact that the list is nested with different data types and lenghts. 回答1: expanding on my comment: from argparse import ArgumentParser import json

问题 I have the python interpreter location in my path environment variable so that I don't need to explicitly call the python interpreter from the command line. However, when I use the argparse module to read command line arguments, it only works if I explicitly call the python interpreter. import argparse parser = argparse.ArgumentParser() parser.add_argument('w') cmd_args = parser.parse_args() print(cmd_args.w) when I don't explicitly call the interpreter, this occurs: C:\Users\nheme\Desktop>

问题 I would like to have 3 optional positional arguments ( int , int , then str ). What I want: $ ./args.py 0 100 vid start=0 end=100 video='vid' $ ./args.py 0 100 start=0 end=100 video=None $ ./args.py 0 start=0 end=None video=None $ ./args.py vid start=None end=None video='vid' $ ./args.py start=None end=None video=None What I have tried: #!/usr/bin/python3 import argparse parser = argparse.ArgumentParser() parser.add_argument('start', type=int, nargs='?') parser.add_argument('end', type=int,

问题 I have the following code parser = argparse.ArgumentParser(allow_abbrev=False, add_help=False) parser.add_argument('--conf', nargs=1) parser.add_argument('-h', '--help', nargs='?', const='generic') parser.add_argument('-v', '--version', action="store_true") subparsers = parser.add_subparsers() subparsers.required = False parser_start = subparsers.add_parser('start') group1 = parser_start.add_mutually_exclusive_group() group1.add_argument('--quiet', action="store_true") group1.add_argument('-V

问题 I defined a custom regex type for an argument that needs to follow an exact format. I used code from another post (regex custom type) that has been super useful. My problem is that I'm writing unit tests where I expect the regex to fail and trying to assert that the argparse.ArgumentError is raised ( assertRaises(argparse.ArgumentError, parser.parse_args(inargs.split())) ). The problem is that argparse appears to be catching the ArgumentError and throwing a generic error, preventing me from

问题 Is there a way to pass -- as a value to a Python program using argparse without using the equals (=) sign? The command line arguments that I added to the argparser are defined like below: parser.add_argument('--myarg', help="my arg description") You would use this argument in a program like this: python myprogram.py --myarg value123 Is there a way to run this program with -- as the value instead of 'value123'? i.e python myprogram.py --myarg -- 回答1: I suspect it will not be possible to make

问题 I have command line arguments in a string and I need to split it to feed to argparse.ArgumentParser.parse_args . I see that the documentation uses string.split() plentifully. However in complex cases, this does not work, such as --foo "spaces in brakets" --bar escaped\ spaces Is there a functionality to do that in python? ( A similar question for java was asked here ). 回答1: This is what shlex.split was created for. 回答2: If you're parsing a windows-style command line, then shlex.split doesn't

问题 For a program with many subcommands, I'd like to show them logically grouped in the --help output. Python argparse has a add_argument_group method, but it doesn't seem compatible with subparsers. subparsers can only be added to the top level ArgumentParser , and _SubParsersAction doesn't allow argument groups. Is there some way around this? 回答1: You can't really do it in any straightforward way, other than implementing a custom HelpFormatter . You can find some more information on

问题 How do I check for a particular subparser? import argparse if __name__ == "__main__": mainparser = argparse.ArgumentParser() submainadder = mainparser.add_subparsers(title='subcommands') parser_ut = submainadder.add_parser('unittest') stuff = mainparser.parse_args() # if 'unittest' was selected: # do_things() 回答1: Maybe something like this ? import argparse def do_things(args): print args # Do your stuff mainparser = argparse.ArgumentParser() submainadder = mainparser.add_subparsers(title=