（十八）三元表达式和列表解析

三元表达式和列表解析

可以很大程度上减少代码量

x=4
y=3
if x>y:
    print(x)
else:
    print(y)

print('aaa' if x>y else 'bbb')


def max(x,y):
    # if x>y:
    #     return x
    # else:
    #     return y

    return x if x>y else y
print(max(5,6))




s='hello'
l=[]
for i in s:
    res=i.upper()
    l.append(res)
print(l)

a='hello'
res=[i.upper() for i in a]
print(res)


>>>
['H', 'E', 'L', 'L', 'O']
['H', 'E', 'L', 'L', 'O']



l=[1,31,73,84,57,22]
l_new=[]
for i in l:
    if i >50:
        l_new.append(i)
print(l_new)

res=[i for i in l if i > 50]
print(res)


>>>
[73, 84, 57]
[73, 84, 57]


l=[1,2,3,4,5,10]

print([i for i in l if i > 4 and i < 10])

>>>
[5]