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