sorted

假设我们用一组tuple表示学生名字和成绩:

L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]
请用sorted()对上述列表分别按名字排序:

# -*- coding: utf-8 -*-

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

def by_name(t):
    return t[0]
L2 = sorted(L, key=by_name)
print(L2)

 Run

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

  

再按成绩从高到低排序:

# -*- coding: utf-8 -*-

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

def by_score(t):
    return -t[1]

L2 = sorted(L, key=by_score)
print(L2)

  Run

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

  

练习:
L1 = {'Bob':75, 'Adam':92,'Bart':66,'Lisa':88}
L2 = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]

print(L1['Bob'])
print(L2[0][0])

  

 

 

 

posted @ 2018-04-29 11:05  Gringer  阅读(172)  评论(0编辑  收藏  举报