deepcopy dict data, ignore file object (_io.BufferedReader)

    Args:
        data (dict): dict data structure
            {
                'a': 1,
                'b': [2, 4],
                'c': lambda x: x+1,
                'd': open('LICENSE'),
                'f': {
                    'f1': {'a1': 2},
                    'f2': io.open('LICENSE', 'rb'),
                }
            }

    Returns:
        dict: deep copied dict data, with file object unchanged.

def deepcopy_dict(data):
    """ deepcopy dict data, ignore file object (_io.BufferedReader)

    Args:
        data (dict): dict data structure
            {
                'a': 1,
                'b': [2, 4],
                'c': lambda x: x+1,
                'd': open('LICENSE'),
                'f': {
                    'f1': {'a1': 2},
                    'f2': io.open('LICENSE', 'rb'),
                }
            }

    Returns:
        dict: deep copied dict data, with file object unchanged.

    """
    try:
        return copy.deepcopy(data)
    except TypeError:
        copied_data = {}
        for key, value in data.items():
            if isinstance(value, dict):
                copied_data[key] = deepcopy_dict(value)
            else:
                try:
                    copied_data[key] = copy.deepcopy(value)
                except TypeError:
                    copied_data[key] = value

        return copied_data