remove unneeded uses of str()

Lib/lib2to3/fixes/fix_imports.py

@@ -123,7 +123,7 @@ class FixImports(fixer_base.BaseFix):
         import_mod = results.get("module_name")
         if import_mod:
             mod_name = import_mod.value
-            new_name = str(self.mapping[mod_name])
+            new_name = self.mapping[mod_name]
             import_mod.replace(Name(new_name, prefix=import_mod.get_prefix()))
             if "name_import" in results:
                 # If it's not a "from x import x, y" or "import x as y" import,

Lib/lib2to3/fixes/fix_methodattrs.py

@@ -19,5 +19,5 @@ class FixMethodattrs(fixer_base.BaseFix):
 
     def transform(self, node, results):
         attr = results["attr"][0]
-        new = str(MAP[attr.value])
+        new = MAP[attr.value]
         attr.replace(Name(new, prefix=attr.get_prefix()))

Lib/lib2to3/fixes/fix_renames.py

@@ -65,5 +65,5 @@ class FixRenames(fixer_base.BaseFix):
         #import_mod = results.get("module")
 
         if mod_name and attr_name:
-            new_attr = str(LOOKUP[(mod_name.value, attr_name.value)])
+            new_attr = LOOKUP[(mod_name.value, attr_name.value)]
             attr_name.replace(Name(new_attr, prefix=attr_name.get_prefix()))

Lib/lib2to3/fixes/fix_types.py

@@ -56,7 +56,7 @@ class FixTypes(fixer_base.BaseFix):
     PATTERN = '|'.join(_pats)
 
     def transform(self, node, results):
-        new_value = str(_TYPE_MAPPING.get(results["name"].value))
+        new_value = _TYPE_MAPPING.get(results["name"].value)
         if new_value:
             return Name(new_value, prefix=node.get_prefix())
         return None