Method to replace all instances of a string in an arbitrary object containing dictionaries, arrays, strings and numbers

gistfile1.py

def replaceStringInObject(obj, old, new):
  if isinstance(obj, list):
    for i in range(len(obj)):
      if isinstance(obj[i], str) and obj[i] == old:
        obj[i] = new
      else:
        replacestrinobj(obj[i], old, new)
  elif isinstance(obj, dict):
    for k in obj:
      if isinstance(obj[k], str) and obj[k] == old:
        obj[k] = new
      else:
        replacestrinobj(obj[k], old, new)
      if isinstance(k, str) and k == old:
        obj[new] = obj[k]
        del obj[k]
      else:
        replacestrinobj(k, old, new)