1 """ 2 Fixer that changes zip(seq0, seq1, ...) into list(zip(seq0, seq1, ...) 3 unless there exists a 'from future_builtins import zip' statement in the 4 top-level namespace. 5 6 We avoid the transformation if the zip() call is directly contained in 7 iter(<>), list(<>), tuple(<>), sorted(<>), ...join(<>), or for V in <>:. 8 """ 9 10 # Local imports 11 from .. import fixer_base 12 from ..pytree import Node 13 from ..pygram import python_symbols as syms 14 from ..fixer_util import Name, ArgList, in_special_context 15 16 17 class FixZip(fixer_base.ConditionalFix): 18 19 BM_compatible = True 20 PATTERN = """ 21 power< 'zip' args=trailer< '(' [any] ')' > [trailers=trailer*] 22 > 23 """ 24 25 skip_on = "future_builtins.zip" 26 27 def transform(self, node, results): 28 if self.should_skip(node): 29 return 30 31 if in_special_context(node): 32 return None 33 34 args = results['args'].clone() 35 args.prefix = "" 36 37 trailers = [] 38 if 'trailers' in results: 39 trailers = [n.clone() for n in results['trailers']] 40 for n in trailers: 41 n.prefix = "" 42 43 new = Node(syms.power, [Name("zip"), args], prefix="") 44 new = Node(syms.power, [Name("list"), ArgList([new])] + trailers) 45 new.prefix = node.prefix 46 return new 47
