Remove unused code

Author: dittos

graphql/core/execution/__init__.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 import collections
-import re
 from ..error import GraphQLError, format_error
 from ..utils import type_from_ast, is_nullish
 from ..language import ast
@@ -398,13 +397,6 @@ def complete_value(ctx, return_type, field_asts, info, result):
     return execute_fields(ctx, object_type, result, subfield_asts)
 
 
-CAMEL_CASE_PATTERN = re.compile(r'([a-z])([A-Z]+)')
-
-
-def camel_to_snake_case(name):
-    return CAMEL_CASE_PATTERN.sub(lambda m: m.group(1) + '_' + m.group(2).lower(), name)
-
-
 def default_resolve_fn(source, args, info):
     """If a resolve function is not given, then a default resolve behavior is used which takes the property of the source object
     of the same name as the field and returns it as the result, or if it's a function, returns the result of calling that function."""