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L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]

def _name(t):

    return t[0]

print(sorted(L,key=_name))

def _score(t):

    return t[1]

print(sorted(L,key=_score,reverse=True))

[('Adam', 92), ('Bart', 66), ('Bob', 75), ('Lisa', 88)]

[('Adam', 92), ('Lisa', 88), ('Bob', 75), ('Bart', 66)]


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