code: def merge(a, b):
      "merges b into a recursively if a and b are dicts"
      for key in b:
          if isinstance(a.get(key), dict) and isinstance(b.get(key), dict):
              merge(a[key], b[key])
          else:
              a[key] = b[key]
      return f merge(a, b):
      "merges b into a recursively if a and b are dicts"
      for key in b:
          if isinstance(a.get(key), dict) and isinstance(b.get(key), dict):
              merge(a[key], b[key])
          else:
              a[key] = b[key]
      return a
docs: merges b into a recursively if a and b are dicts