yapf tools/buildgen
diff --git a/tools/buildgen/bunch.py b/tools/buildgen/bunch.py
index 813051a..0ce9a6b 100755
--- a/tools/buildgen/bunch.py
+++ b/tools/buildgen/bunch.py
@@ -11,43 +11,42 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 """Allows dot-accessible dictionaries."""
 
 
 class Bunch(dict):
 
-  def __init__(self, d):
-    dict.__init__(self, d)
-    self.__dict__.update(d)
+    def __init__(self, d):
+        dict.__init__(self, d)
+        self.__dict__.update(d)
 
 
 # Converts any kind of variable to a Bunch
 def to_bunch(var):
-  if isinstance(var, list):
-    return [to_bunch(i) for i in var]
-  if isinstance(var, dict):
-    ret = {}
-    for k, v in var.items():
-      if isinstance(v, (list, dict)):
-        v = to_bunch(v)
-      ret[k] = v
-    return Bunch(ret)
-  else:
-    return var
+    if isinstance(var, list):
+        return [to_bunch(i) for i in var]
+    if isinstance(var, dict):
+        ret = {}
+        for k, v in var.items():
+            if isinstance(v, (list, dict)):
+                v = to_bunch(v)
+            ret[k] = v
+        return Bunch(ret)
+    else:
+        return var
 
 
 # Merges JSON 'add' into JSON 'dst'
 def merge_json(dst, add):
-  if isinstance(dst, dict) and isinstance(add, dict):
-    for k, v in add.items():
-      if k in dst:
-        if k == '#': continue
-        merge_json(dst[k], v)
-      else:
-        dst[k] = v
-  elif isinstance(dst, list) and isinstance(add, list):
-    dst.extend(add)
-  else:
-    raise Exception('Tried to merge incompatible objects %s %s\n\n%r\n\n%r' % (type(dst).__name__, type(add).__name__, dst, add))
-
+    if isinstance(dst, dict) and isinstance(add, dict):
+        for k, v in add.items():
+            if k in dst:
+                if k == '#': continue
+                merge_json(dst[k], v)
+            else:
+                dst[k] = v
+    elif isinstance(dst, list) and isinstance(add, list):
+        dst.extend(add)
+    else:
+        raise Exception('Tried to merge incompatible objects %s %s\n\n%r\n\n%r'
+                        % (type(dst).__name__, type(add).__name__, dst, add))