Import lib2to3.

Lib/lib2to3/fixes/fix_callable.py

@@ -0,0 +1,31 @@
+# Copyright 2007 Google, Inc. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer for callable().
+
+This converts callable(obj) into hasattr(obj, '__call__')."""
+
+# Local imports
+from .. import pytree
+from . import basefix
+from .util import Call, Name, String
+
+class FixCallable(basefix.BaseFix):
+
+    # Ignore callable(*args) or use of keywords.
+    # Either could be a hint that the builtin callable() is not being used.
+    PATTERN = """
+    power< 'callable'
+           trailer< lpar='('
+                    ( not(arglist | argument<any '=' any>) func=any
+                      | func=arglist<(not argument<any '=' any>) any ','> )
+                    rpar=')' >
+           after=any*
+    >
+    """
+
+    def transform(self, node, results):
+        func = results["func"]
+
+        args = [func.clone(), String(', '), String("'__call__'")]
+        return Call(Name("hasattr"), args, prefix=node.get_prefix())