mirror of https://github.com/python/cpython
44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
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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 basefix
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from .util import Name, Call, does_tree_import, in_special_context
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class FixZip(basefix.BaseFix):
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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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def start_tree(self, *args):
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super(FixZip, self).start_tree(*args)
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self._future_zip_found = None
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def has_future_zip(self, node):
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if self._future_zip_found is not None:
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return self._future_zip_found
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self._future_zip_found = does_tree_import('future_builtins', 'zip', node)
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return self._future_zip_found
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def transform(self, node, results):
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if self.has_future_zip(node):
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# If a future zip has been imported for this file, we won't
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# be making any modifications
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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
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