How to use 'json stringify online' in Python

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def stringify(obj):
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    """Convert object to string.
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    If the object is a dictionary-like object or list,
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    the objects in the dictionary or list will be converted to strings, recursively.
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    Returns: If the input is dictionary or list, the return value will also be a list or dictionary.
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    """
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    if isinstance(obj, collections.Mapping):
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        obj = copy.deepcopy(obj)
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        obj_dict = {}
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        for key, value in obj.items():
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            obj_dict[key] = stringify(value)
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        return obj_dict
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    elif isinstance(obj, list):
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        str_list = []
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        for item in obj:
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            str_list.append(stringify(item))
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        return str_list
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    else:
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        try:
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            json.dumps(obj)
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            return obj
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        except TypeError:
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            return str(obj)

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def stringify(data):
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  str_data = ""
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  if type(data) == dict or type(data) == list:
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    return json.dumps(data)
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  else:
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    try:
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      str_data = str(data)
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      return str_data
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    except Exception as e:
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      return data