python 进阶语法lambda 函数与列表推导式练习

一、lambda推导式

tuples = [(1, 'c'), (2, "d"), (3, 'a'), (4, 'c')]

ret = sorted(tuples,key=lambda x:x[1])
ret1 = sorted(tuples,key=lambda x:x[0])
print("打印ret结果:",ret)
print("打印ret1结果:",ret1)

tuples3 = {'a': 'China', 'd': 'USA', 'b': 'Russia', 'g': 'Kanada','c':'Auster'}
ret3 = sorted(tuples3.items(),key=lambda x :x[0])
ret4 = sorted(tuples3.items(),key=lambda x :x[1])
print("打印ret3结果:",ret3)
print("打印ret4结果:",ret4)

结果：

二、列表腿导式

 tuples = [(1, 'c'), (2, "d"), (3, 'a'), (4, 'c')]

ret5=[]
for i in tuples:
    ret5.append(i)
print("打印ret5结果:",sorted(ret5))

ret6=sorted([ i for i in tuples ])
print("打印ret6结果:",ret6)

ret7=sorted([ i[1] for i in tuples ])
print("打印ret7结果:",ret7)

结果：