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u""" Fixer for: it.__next__() -> it.next(). next(it) -> it.next(). """ from lib2to3.pgen2 import token from lib2to3.pygram import python_symbols as syms from lib2to3 import fixer_base from lib2to3.fixer_util import Name, Call, find_binding, Attr bind_warning = u"Calls to builtin next() possibly shadowed by global binding" class FixNext(fixer_base.BaseFix): PATTERN = u""" power< base=any+ trailer< '.' attr='__next__' > any* > | power< head='next' trailer< '(' arg=any ')' > any* > | classdef< 'class' base=any+ ':' suite< any* funcdef< 'def' attr='__next__' parameters< '(' NAME ')' > any+ > any* > > """ def transform(self, node, results): assert results base = results.get(u"base") attr = results.get(u"attr") head = results.get(u"head") arg_ = results.get(u"arg") if arg_: arg = arg_.clone() head.replace(Attr(Name(unicode(arg),prefix=head.prefix), Name(u"next"))) arg_.remove() elif base: attr.replace(Name(u"next", prefix=attr.prefix))