Python面试题

1、去除列表中的重复元素

#_*_coding:utf-8_*_

ls = [1,3,6,9,2,5,1,3,7,8,6]
print('ls  >>> ',ls)

# 方法1
ls1 = list(set(ls))
print('ls1 >>> ',ls1)

# 方法2
ls2 = {}.fromkeys(ls).keys()
ls2 = [l for l in ls2]
print('ls2 >>> ',ls2)

# 方法3
ls3 = list(set(ls))
ls3.sort(key=ls.index)  #保持原list元素顺序
print('ls3 >>> ',ls3)

# 方法4
ls4 = []
[ls4.append(i) for i in ls if i not in ls4]
print('ls4 >>> ',ls4)

2、删除指定文件

#_*_coding:utf-8_*_

import os

filepath = 't.txt'

os.remove(filepath)

3、读取文件中的内容并打印在屏幕上

with open('1.txt','r') as fp:
    contents = fp.readlines()
    print(contents)
    for content in contents:
        print(content.replace('\n',''))

5、反向获取list元素最快的方式

ls = [1,3,6,9,2,5,1,3,7,8,6]
ls6 = ls[::-1]

4、 list和tuple的互相转换

ts = (1, 3, 6, 9, 2, 5, 1, 3, 7, 8, 6)
ls = [1, 3, 6, 9, 2, 5, 1, 3, 7, 8, 6]

list(ts)
tuple(ls)