<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_contract_headers(self, table):
 """ Parse the years on the contract. The years are listed as the headers on the contract. The first header contains 'Team' which specifies the player's current team and should not be included in the years. Parameters table : PyQuery object A PyQuery object containing the contract table. Returns ------- list Returns a list where each element is a string denoting the season, such as '2017-18'. """

        years = [i.text() for i in table('th').items()]
        years.remove('Team')
        return years