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>>> p = {'ftpd[001]': [111, 222]} >>> p {'ftpd[001]': [111, 222]} >>> p['ftpd[001]'] [111, 222] >>> p['ftpd[001]'][1] 222 >>> p['ftpd[001]'][1] - p['ftpd[001]'][0] 111 >>> p['ftpd[001]'][0] 111 >>> p['ftpd[001]'][0] = 555 >>> p['ftpd[001]'][1] - p['ftpd[001]'][0] -333 >>> p {'ftpd[001]': [555, 222]}