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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* >
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power< head='next' trailer< '(' arg=any ')' > any* >
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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))