""" Fixer that changes zip(seq0, seq1, ...) into list(zip(seq0, seq1, ...) unless there exists a 'from future_builtins import zip' statement in the top-level namespace. We avoid the transformation if the zip() call is directly contained in iter(<>), list(<>), tuple(<>), sorted(<>), ...join(<>), or for V in <>:. """ # Local imports from .. import fixer_base from ..pytree import Node from ..pygram import python_symbols as syms from ..fixer_util import Name, ArgList, in_special_context class FixZip(fixer_base.ConditionalFix): BM_compatible = True PATTERN = """ power< 'zip' args=trailer< '(' [any] ')' > [trailers=trailer*] > """ skip_on = "future_builtins.zip" def transform(self, node, results): if self.should_skip(node): return if in_special_context(node): return None args = results['args'].clone() args.prefix = "" trailers = [] if 'trailers' in results: trailers = [n.clone() for n in results['trailers']] for n in trailers: n.prefix = "" new = Node(syms.power, [Name("zip"), args], prefix="") new = Node(syms.power, [Name("list"), ArgList([new])] + trailers) new.prefix = node.prefix return new