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fix_paren.py1.2 KB · 45 lines
"""Fixer that adds parentheses where they are required This converts ``[x for x in 1, 2]`` to ``[x for x in (1, 2)]``.""" # By Taek Joo Kim and Benjamin Peterson # Local importsfrom .. import fixer_basefrom ..fixer_util import LParen, RParen # XXX This doesn't support nested for loops like [x for x in 1, 2 for x in 1, 2]class FixParen(fixer_base.BaseFix):    BM_compatible = True     PATTERN = """        atom< ('[' | '(')            (listmaker< any                comp_for<                    'for' NAME 'in'                    target=testlist_safe< any (',' any)+ [',']                     >                    [any]                >            >            |            testlist_gexp< any                comp_for<                    'for' NAME 'in'                    target=testlist_safe< any (',' any)+ [',']                     >                    [any]                >            >)        (']' | ')') >    """     def transform(self, node, results):        target = results["target"]         lparen = LParen()        lparen.prefix = target.prefix        target.prefix = "" # Make it hug the parentheses        target.insert_child(0, lparen)        target.append_child(RParen())