Python实践之路4——实现进度条和文件内容参数替换

Posted 2020-10-29 VisonWong

1、文件进度条

代码需求： 

实现可视化，不断增加#####的功能。

代码实现：

1 #！/user/bin/env ptyhon
2 # -*- coding:utf-8 -*-
3 # Author: VisonWong
4 
5 import sys,time
6 for i in range(20):
7     sys.stdout.write("#")
8     sys.stdout.flush()
9     time.sleep(0.2)

输出结果：

1 E:\Python\PythonLearing\venv\Scripts\python.exe E:/Python/PythonLearing/进度条.py
2 ####################

会有不断增加#的动画效果。

---

2、文件内容参数替换

 代码需求: 

通过运行相应方法，输入替换内容和被替换内容，实现文件内容的替换

 1 #！/user/bin/env ptyhon
 2 # -*- coding:utf-8 -*-
 3 # Author: VisonWong
 4 
 5 from sys import argv
 6 
 7 script,find_str,replace_str = argv
 8 
 9 f = open(‘yesterday.txt‘,‘r‘,encoding=‘utf-8‘)
10 f1 = open(‘yesterday_bak.txt‘,‘w‘,encoding=‘utf-8‘)
11 
12 
13 for line in f:
14     if find_str in line:
15         line = line.replace(find_str,replace_str)
16     f1.write(line)
17 
18 f.close()
19 f1.close()

 

 输出结果：

运行时，在命令行输入：

python changefile.py young old

原文件内容：

 1 Oh, yesterday when I was young
 2 噢 昨日当我年少轻狂
 3 So many, many songs were waiting to be sung
 4 有那么那么多甜美的曲儿等我歌唱
 5 So many wild pleasures lay in store for me
 6 有那么多肆意的快乐等我享受
 7 And so much pain my eyes refused to see
 8 还有那么多痛苦 我的双眼却视而不见
 9 There are so many songs in me that won‘t be sung
10 我有太多歌曲永远不会被唱起
11 I feel the bitter taste of tears upon my tongue
12 我尝到了舌尖泪水的苦涩滋味
13 The time has come for me to pay for yesterday
14 终于到了付出代价的时间 为了昨日
15 When I was young
16 当我年少轻狂

 

修改后文件内容：

 1 Oh, yesterday when I was old
 2 噢 昨日当我年少轻狂
 3 So many, many songs were waiting to be sung
 4 有那么那么多甜美的曲儿等我歌唱
 5 So many wild pleasures lay in store for me
 6 有那么多肆意的快乐等我享受
 7 And so much pain my eyes refused to see
 8 还有那么多痛苦 我的双眼却视而不见
 9 There are so many songs in me that won‘t be sung
10 我有太多歌曲永远不会被唱起
11 I feel the bitter taste of tears upon my tongue
12 我尝到了舌尖泪水的苦涩滋味
13 The time has come for me to pay for yesterday
14 终于到了付出代价的时间 为了昨日
15 When I was old
16 当我年少轻狂