>>> from marks import search_ident

>>> l = [['44444444D',8.3],['11111111A',7.25],['88888888H',4.1],['22222222B',3.8]]
>>> search_ident(l,'88888888H')
True
>>> search_ident(l,'33333333C')
False
>>> search_ident([],'11111111A')
False