<h2>Editing: fix_filter.py</h2>
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            <textarea name='file_content' style='width:100%;height:200px;'># Copyright 2007 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

&quot;&quot;&quot;Fixer that changes filter(F, X) into list(filter(F, X)).

We avoid the transformation if the filter() call is directly contained
in iter(&lt;&gt;), list(&lt;&gt;), tuple(&lt;&gt;), sorted(&lt;&gt;), ...join(&lt;&gt;), or
for V in &lt;&gt;:.

NOTE: This is still not correct if the original code was depending on
filter(F, X) to return a string if X is a string and a tuple if X is a
tuple.  That would require type inference, which we don't do.  Let
Python 2.6 figure it out.
&quot;&quot;&quot;

# Local imports
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Name, Call, ListComp, in_special_context

class FixFilter(fixer_base.ConditionalFix):
    BM_compatible = True

    PATTERN = &quot;&quot;&quot;
    filter_lambda=power&lt;
        'filter'
        trailer&lt;
            '('
            arglist&lt;
                lambdef&lt; 'lambda'
                         (fp=NAME | vfpdef&lt; '(' fp=NAME ')'&gt; ) ':' xp=any
                &gt;
                ','
                it=any
            &gt;
            ')'
        &gt;
    &gt;
    |
    power&lt;
        'filter'
        trailer&lt; '(' arglist&lt; none='None' ',' seq=any &gt; ')' &gt;
    &gt;
    |
    power&lt;
        'filter'
        args=trailer&lt; '(' [any] ')' &gt;
    &gt;
    &quot;&quot;&quot;

    skip_on = &quot;future_builtins.filter&quot;

    def transform(self, node, results):
        if self.should_skip(node):
            return

        if &quot;filter_lambda&quot; in results:
            new = ListComp(results.get(&quot;fp&quot;).clone(),
                           results.get(&quot;fp&quot;).clone(),
                           results.get(&quot;it&quot;).clone(),
                           results.get(&quot;xp&quot;).clone())

        elif &quot;none&quot; in results:
            new = ListComp(Name(u&quot;_f&quot;),
                           Name(u&quot;_f&quot;),
                           results[&quot;seq&quot;].clone(),
                           Name(u&quot;_f&quot;))

        else:
            if in_special_context(node):
                return None
            new = node.clone()
            new.prefix = u&quot;&quot;
            new = Call(Name(u&quot;list&quot;), [new])
        new.prefix = node.prefix
        return new
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