parsing - Python argparse key=value parameters -

i've tried answer on stack overflow, can't find exact answer particular case.

this first link has same question in first section, unanswered (python argparse: parameter=value). , second question similar, can't seem working particular case ( using argparse parse arguments of form "arg= val").

so situation -- re-writing python wrapper used many other scripts (i prefer not modify these other scripts). currently, python wrapper called command line arguments of form --key=value number of different arguments, parsed manually. parse them argparse.

n.b. argument names unwieldy, renaming using dest option in add_argument.

parser = argparse.argumentparser(description='wrappin ronnie reagan') parser.add_argument("--verylongargname1", nargs=1, dest="arg1", required=true) parser.add_argument("--verylongargname2", nargs=1,   dest="arg2") parser.add_argument("--verylongargname3", nargs=1,  dest="arg3") useropts = vars(parser.parse_args()) 

which, while apparently parsing passed command lines correctly, displays help:

usage: testing_argsparse.py [-h] --verylongargname1 arg1                         [--verylongargname2 arg2]                         [--verylongargname3 arg3] testing_argsparse.py: error: argument --verylongargname1 required 

but want parameters specified --key=value format, not --key value. i.e.

usage: testing_argsparse.py [-h] --verylongargname1=arg1                         [--verylongargname2=arg2]                         [--verylongargname3=arg3] testing_argsparse.py: error: argument --verylongargname1 required 

thanks in advance!

testing_argsparse.py --verylongargname1=foo 

works. argparse module accepts both --verylongargname1=foo , --verylongargname1 foo formats.

what exact command line arguments trying pass argparse that's causing not work?