Source code for taurus.core.util.parse_args

#!/usr/bin/env python

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# This file is part of Taurus
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# http://taurus-scada.org
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# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
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# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
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# Taurus is distributed in the hope that it will be useful,
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# GNU Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public License
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#############################################################################

from __future__ import print_function
from ast import literal_eval


[docs]def parse_args(s, strip_pars=False): """ Parse a string representing arguments to a method to return the corresponding args and kwargs. :param s: string representing arguments to a method :param strip_pars: (bool) If True, expect s to include surrounding parenthesis :return: args, kwargs (a list of positional arguments and a dict of keyword arguments) """ s = s.strip() if strip_pars: # remove parentheses if s.startswith('(') and s.endswith(')'): s = s[1:-1].strip() if not s: # empty arg list return [], {} a = [] kw = {} for e in s.split(','): if '=' in e: k, v = e.split('=') kw[k.strip()] = literal_eval(v.strip()) else: if kw: # a non-kwarg found after we already have at least one kwarg raise SyntaxError('non-keyword arg after keyword arg') a.append(literal_eval(e.strip())) return a, kw
if __name__ == "__main__": print(parse_args('1, 2, b=3, c=4')) print(parse_args(' (1, 2, b=3, c=4 )', strip_pars=True)) print(parse_args('1, 2, b=3, c=4, 5')) # <--this should raise a SyntaxError