update to python3.7

lib/python3.7/lib2to3/fixes/fix_intern.py

@@ -0,0 +1,41 @@
+# Copyright 2006 Georg Brandl.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer for intern().
+
+intern(s) -> sys.intern(s)"""
+
+# Local imports
+from .. import fixer_base
+from ..fixer_util import ImportAndCall, touch_import
+
+
+class FixIntern(fixer_base.BaseFix):
+    BM_compatible = True
+    order = "pre"
+
+    PATTERN = """
+    power< 'intern'
+           trailer< lpar='('
+                    ( not(arglist | argument<any '=' any>) obj=any
+                      | obj=arglist<(not argument<any '=' any>) any ','> )
+                    rpar=')' >
+           after=any*
+    >
+    """
+
+    def transform(self, node, results):
+        if results:
+            # I feel like we should be able to express this logic in the
+            # PATTERN above but I don't know how to do it so...
+            obj = results['obj']
+            if obj:
+                if obj.type == self.syms.star_expr:
+                    return  # Make no change.
+                if (obj.type == self.syms.argument and
+                    obj.children[0].value == '**'):
+                    return  # Make no change.
+        names = ('sys', 'intern')
+        new = ImportAndCall(node, results, names)
+        touch_import(None, 'sys', node)
+        return new