code: def patch(self, overrides):
          
          overrides = overrides or {}
          for key, value in iteritems(overrides):
              current = self.get(key)
              if isinstance(value, dict) and isinstance(current, dict):
                  current.patch(value)
              else:
                  self[key] = value
docs: Patches the config with the given overrides.
  
          Example:
  
          If the current dictionary looks like this:
          a: 1,
          b: {
              c: 3,
              d: 4
          }
  
          and `patch` is called with the following overrides:
          b: {
              d: 2,
              e: 4
          },
          c: 5
  
          then, the following will be the resulting dictionary:
          a: 1,
          b: {
              c: 3,
              d: 2,
              e: 4
          },
          c: 5