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Viewing changes to Lib/lib2to3/fixes/fix_zip.py

  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2009-03-23 00:01:27 UTC
  • Revision ID: james.westby@ubuntu.com-20090323000127-5fstfxju4ufrhthq
Tags: upstream-3.1~a1+20090322
Import upstream version 3.1~a1+20090322

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Lib/lib2to3/fixes/fix_zip.py
 
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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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# Local imports
 
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from .. import fixer_base
 
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from ..fixer_util import Name, Call, in_special_context
 
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class FixZip(fixer_base.ConditionalFix):
 
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    PATTERN = """
 
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    power< 'zip' args=trailer< '(' [any] ')' >
 
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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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        new = node.clone()
 
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        new.set_prefix("")
 
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        new = Call(Name("list"), [new])
 
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        new.set_prefix(node.get_prefix())
 
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        return new