面试题汇总

1.用一行代码令a，b的值互换

a,b = 1,2
print(a,b)
a = 1
b = 2
a,b = b,a  #面试题
print(a,b)
a,b = [1,2],[2,3]
print(a,b)
a,b = (1,2)
print(a,b)

 2、去重

#去重
li = [1,2,33,33,2,1,4,5,6,6]
set1 = set(li)
# print(set1)
li = list(set1)
print(li)
s1 = {1,2,3}
print(s1,type(s1))

 3.生成器函数面试题

面试题一

# 面试题1
def demo():
    for i in range(4):
        yield i


g = demo()
g1 = (i for i in g)
g2 = (i for i in g1)

#print(list(g))
#print(list(g1))
print(list(g2))

 

面试题2

# 面试题2


def add(n,i):
    return n+i


def test():   
    for i in range(4):
        yield i


g = test()   #得到生成器函数，但是并没有执行函数内部的代码
for n in [1, 10]:
    g=(add(n, i) for i in g)

print(list(g))

# 执行过程：
# n = 1
# g = (add(n, i) for i in g)
# n = 10
# g = (add(n, i) for i in g)
# n = 5
# g = (add(n, i) for i in g)

# g = (add(n, i) for i in (add(n, i) for i in (add(n, i) for i in test())))
# g = (add(n, i) for i in (add(n, i) for i in (add(n, i) for i in [0,1,2,3])))  # n = 5
# g = (add(n, i) for i in (add(n, i) for i in [5,6,7,8]))  # n = 5
# g = (add(n, i) for i in [10,11,12,13])  # n = 5
# g = [15,16,17,18]