argparse

问题 I'm using Python 2.7 and I'm trying to accomplish a shell like behavior using argparse. My issue, in general, that I cannot seem to find a way, in Python 2.7, to use argparse's subparsers as optional. It's kind of hard to explain my issue so I'll describe what I require from my program. The program has 2 modes of work: Starting the program with a given command (each command has it's own additional arguments) and additional arguments will run a specific task. Starting the program without a

问题 I have a program using argparse. It takes 1 required positional argument, 1 optional positional argument, and 1 flag argument. Something like: usage: test.py [-h] [-a A] b [c] So, I tried using this: parser = argparse.ArgumentParser() parser.add_argument('-a') parser.add_argument('b') parser.add_argument('c', nargs='?', default=None) print(parser.parse_args()) Which works fine for test.py B C -a A and test.py -a A B C . But when I do test.py B -a A C , it throws an error: $ python3 test.py B

问题 I want to construct a argparser help message that looks like: -i, --input=INPUT help for input -o, --output=output help for output My current code: arg_parser = argparse.ArgumentParser arg_parser.add_argument('-i', '--input', dest='input', metavar='=INPUT', help='help for input') arg_parser.add_argument('-o', '--output', dest='output', metavar='=OUTPUT', help='help for output') arg_parser.print_help() is giving me -i =INPUT, --input =INPUT help for input -o =INPUT, --output =output help for

问题 My script defines one main parser and multiple subparsers. I want to apply the -p argument to some subparsers. So far the code looks like this: parser = argparse.ArgumentParser(prog="myProg") subparsers = parser.add_subparsers(title="actions") parser.add_argument("-v", "--verbose", action="store_true", dest="VERBOSE", help="run in verbose mode") parser_create = subparsers.add_parser ("create", help = "create the orbix environment") parser_create.add_argument ("-p", type = int, required = True

问题 since I got python on windows running, here is the next problem I encountered with argparse, and for which I did not see a solution. I uses optparse before. Here is my code: import argparse parser = argparse.ArgumentParser( description = 'Test description') # main description for help parser.add_argument('-d', '--dir', # -u or --user option dest = "dir", help = 'directory to start with') args = parser.parse_args() print(args.dir) but when I run this code with either code.py -d test code.py -

问题 import argparse parser = argparse.ArgumentParser(description="List or update! That is the question!") group = parser.add_mutually_exclusive_group() group.add_argument('-l', '--list', dest="update", action='store_false') group.add_argument('-u', '--update', dest="update", action='store_true') args = parser.parse_args() print args If the user does not specify any optional arguments I want update=False . [Edit]: I changed my question to not be so general, it was confusing. Sorry. 回答1: You should

问题 I'm using argparse on Python 3.5.1. I don't want the default help commands, so I disabled it using the add_help=False argument to the ArgumentParser constructor. However, while the help commands for the application are removed, they still exist for the subcommands. How can I remove the help for the subcommands/subparsers? 回答1: The subparser is created in: class _SubParsersAction(Action): .... def add_parser(self, name, **kwargs): ... # create the parser and add it to the map parser = self.

问题 i'm stuck on a task, which require either 2 positional args or 1 (a file) if flag enabled: parser.add_argument('pos_arg1', help='desc') parser.add_argument('pos_arg2', help='desc') parser.add_argument('--add_arg1', help='desc', type=argparse.FileType('r'), nargs='?') so using the script with either script.py arg1 arg2 or script.py --add_arg1 file are both valid. How would I do this? 回答1: If you define: In [422]: parser=argparse.ArgumentParser() In [423]: g=parser.add_mutually_exclusive_group(

问题 Is there a more elegant way to pass an optional list of integers to argparse than to pass a delimited string and parse it later? I also have a positional argument. parser.add_argument('--ids', type=int, nargs='+') parser.add_argument('cmd') doesn't work, because argparse attempts to grab cmd and complains that it isn't an integer. Ideally, I'd like to execute with one of program.py --ids 6,32,12 refresh program.py --ids 6 32 12 refresh or something similar, but also be able to program.py

问题 I'm using the argparse module for this python project. I'm looking to get the available flags out of an ArgumentParser object before calling parse_args() . Anyone have any ideas? 回答1: Got this from the source code of add_argument(): >>> import argparse >>> parser = argparse.ArgumentParser() >>> parser.add_argument('-v', '--verbosity', help='more debug info', action='store_true') _StoreTrueAction(option_strings=['-v', '--verbosity'], dest='verbosity', nargs=0, const=True, default=False, type