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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def column_headers_from_list_of_dicts(self, json_input):
 """ This method is required to implement clubbing. It tries to come up with column headers for your input """

        if not json_input \
        or not hasattr(json_input, '__getitem__') \
        or not hasattr(json_input[0], 'keys'):
            return None
        column_headers = json_input[0].keys()
        for entry in json_input:
            if not hasattr(entry, 'keys') \
            or not hasattr(entry, '__iter__') \
            or len(entry.keys()) != len(column_headers):
                return None
            for header in column_headers:
                if header not in entry:
                    return None
        return column_headers