python常见面试题

1、Python生成随机数

import randomfor i in range(100):    print(random.randint(0,100))

2、字符串逆序

a = "abcdefg"print(a[::-1])

a = "abcdefg"b = list(a)b.reverse()b = ''.join(b)print(b)

3、判断一个字符串是否为回文字符串

（abcdcba 一个字符串从前往后读和从后往前读是一样的。）

a = "abcdcba"if a == a[::-1]:    print('是回文函数')

4、随机生成100个数，然后写入文件

import randomwith open('f.txt','wb') as f:    for i in range(100):        n = random.randint(1, 100)        f.write((str(n) + "\n").encode('UTF-8'))

5、给定字典进行排序

给定dict = {'a':3,'bc':5,'c':3,'asd':4,'33':56,'d':0}

dict = {'a':3,'bc':5,'c':3,'asd':4,'33':56,'d':0}print(dict.items())print(sorted(dict.items(),key = lambda i:i[0],reverse = True))

给定list2 = [[1,2],[4,6],[3,1]]

list2 = [[1,2],[4,6],[3,1]]list2.sort(key = lambda x:x[0],reverse = False)print (list2)

6、对列表进行去重

1.对 a = [1,3,2,2,1,5,5,3]

a = [1, 3, 2, 2, 1, 5, 5, 3]print(set(a))

a = [1, 3, 2, 2, 1, 5, 5, 3]for i in a:    if a.count(i) >1:        a.remove(i)print(a)

7、去重字符串

s = 'abddaddfd'print(''.join(set(list(s))))

8.有UTF-8编码的文件a.txt。文件路径在E盘根目录，写一段程序逐行读入文本文件。并在屏幕（gbk编码）打印出来

  

65001 utf-8      936 GBK 编码 采用chcp命令查看当前的CMD编码。

fp = open("f:\test\a.txt",'r')content = fp.read()fp.close()print (content.decode("utf-8").encode("gbk","ignore"))