In view of the recent discussion on command line parsers,
you may be interested in the attached module which I wrote
in response to a c.l.py posting.
The return values are designed so that they can be used
as the *args and/or **kwds arguments to a function if
desired.
#-----------------------------------------------------------------
#
# A Pythonically minimalistic command line parser
# Inspired by ideas from Huaiyu Zhu
# <huaiyu@gauss.almadan.ibm.com> and Robert Biddle
# <Robert.Biddle@comp.vuw.ac.nz>.
#
# Author: Greg Ewing <greg@cosc.canterbury.ac.nz>
#
#-----------------------------------------------------------------
class CommandLineError(Exception):
pass
def clparse(switches, flags, argv = None):
"""clparse(switches, flags, argv = None)
Parse command line arguments.
switches = string of option characters not taking arguments
flags = string of option characters taking an argument
argv = command line to parse (including program name), defaults
to sys.argv
Returns (args, options) where:
args = list of non-option arguments
options = dictionary mapping switch character to number of
occurrences of the switch, and flag character to
list of arguments specified with that flag
Arguments following "--" are regarded as non-option arguments
even if they start with a hyphen.
"""
if not argv:
import sys
argv = sys.argv
argv = argv[1:]
opts = {}
args = []
for c in switches:
opts[c] = 0
for c in flags:
if c in switches:
raise ValueError("'%c' both switch and flag" % c)
opts[c] = []
seen_dashdash = 0
while argv:
arg = argv.pop(0)
if arg == "--":
seen_dashdash = 1
elif not seen_dashdash and arg.startswith("-"):
for c in arg[1:]:
if c in switches:
opts[c] += 1
elif c in flags:
try:
val = argv.pop(0)
except IndexError:
raise CommandLineError("Missing argument for option -%c" % c)
opts[c].append(val)
else:
raise CommandLineError("Unknown option -%c" % c)
else:
args.append(arg)
return args, opts
if __name__ == "__main__":
def spam(args, a, b, c, x, y, z):
print "a =", a
print "b =", b
print "c =", c
print "x =", x
print "y =", y
print "z =", z
print "args =", args
args, kwds = clparse("abc", "xyz")
spam(args, **kwds)
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