sorted函数初学

# L=[36,5,-12,9,-21]
# print(sorted(L))
# print(sorted(L,key=abs))
# print(sorted(['bob','about','ZOO','Creadit'],key=str.lower,reverse=True))
#key所指向的函数会作用于每一个元素上
L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]
print(L[0])
def by_name(t):
    return t[0]

def by_score(t):
    return t[1]

print ( sorted(L,key = by_name) )
print ( sorted(L,key = by_score) )