1 """ Fixer for itertools.(imap|ifilter|izip) --> (map|filter|zip) and

     2     itertools.ifilterfalse --> itertools.filterfalse (bugs 2360-2363)

     3 

     4     imports from itertools are fixed in fix_itertools_import.py

     5 

     6     If itertools is imported as something else (ie: import itertools as it;

     7     it.izip(spam, eggs)) method calls will not get fixed.

     8     """

     9 

    10 # Local imports

    11 from .. import fixer_base

    12 from ..fixer_util import Name

    13 

    14 class FixItertools(fixer_base.BaseFix):

    15     it_funcs = "('imap'|'ifilter'|'izip'|'ifilterfalse')"

    16     PATTERN = """

    17               power< it='itertools'

    18                   trailer<

    19                      dot='.' func=%(it_funcs)s > trailer< '(' [any] ')' > >

    20               |

    21               power< func=%(it_funcs)s trailer< '(' [any] ')' > >

    22               """ %(locals())

    23 

    24     # Needs to be run after fix_(map|zip|filter)

    25     run_order = 6

    26 

    27     def transform(self, node, results):

    28         prefix = None

    29         func = results['func'][0]

    30         if 'it' in results and func.value != 'ifilterfalse':

    31             dot, it = (results['dot'], results['it'])

    32             # Remove the 'itertools'

    33             prefix = it.get_prefix()

    34             it.remove()

    35             # Replace the node wich contains ('.', 'function') with the

    36             # function (to be consistant with the second part of the pattern)

    37             dot.remove()

    38             func.parent.replace(func)

    39 

    40         prefix = prefix or func.get_prefix()

    41         func.replace(Name(func.value[1:], prefix=prefix))