Minor cleanup to gen_static_metadadta.py

tools/codegen/core/gen_static_metadata.py

@@ -23,7 +23,8 @@ import subprocess
 import re
 import perfection
 
-# Configuration: a list of either strings or 2-tuples of strings.
+# Configuration: a list of either strings or 2-tuples of strings or 3-tuples of
+# strings.
 # A single string represents a static grpc_mdstr.
 # A 2-tuple represents a static grpc_mdelem (and appropriate grpc_mdstrs will
 # also be created).
@@ -329,11 +330,13 @@ else:
 HPACK_H = open(
     os.path.join(
         os.path.dirname(sys.argv[0]),
-            '../../../src/core/ext/transport/chttp2/transport/hpack_mapping.h'), 'w')
+        '../../../src/core/ext/transport/chttp2/transport/hpack_mapping.h'),
+    'w')
 HPACK_C = open(
     os.path.join(
         os.path.dirname(sys.argv[0]),
-            '../../../src/core/ext/transport/chttp2/transport/hpack_mapping.cc'), 'w')
+        '../../../src/core/ext/transport/chttp2/transport/hpack_mapping.cc'),
+    'w')
 
 # copy-paste copyright notice from this file
 with open(sys.argv[0]) as my_source:
@@ -349,7 +352,8 @@ with open(sys.argv[0]) as my_source:
         if line[0] != '#':
             break
         copyright.append(line)
-    put_banner([H, C, HPACK_H, HPACK_C], [line[2:].rstrip() for line in copyright])
+    put_banner([H, C, HPACK_H, HPACK_C],
+               [line[2:].rstrip() for line in copyright])
 
 hex_bytes = [ord(c) for c in 'abcdefABCDEF0123456789']
 
@@ -503,7 +507,7 @@ print >> HPACK_H
 print >> HPACK_C, ('const uint8_t grpc_hpack_static_mdelem_indices['
                    'GRPC_STATIC_MDELEM_COUNT] = {')
 indices = ''
-for i, elem in enumerate(all_elems):
+for elem in all_elems:
     index = 0
     if len(elem) == 3:
         index = elem[2]