1、文件進度條

代碼需求：

實現可視化，不斷增加#####的功能。

代碼實現：

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)

輸出結果：

1 E:\Python\PythonLearing\venv\Scripts\python.exe E:/Python/PythonLearing/進度條.py
 
2 ####################

會有不斷增加#的動畫效果。

2、文件內容參數替換

代碼需求:

通過運行相應方法，輸入替換內容和被替換內容，實現文件內容的替換

 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()

輸出結果：

運行時，在命令行輸入：

python changefile.py young old

原文件內容：

 1 Oh, yesterday when I was young
 2 噢 昨日當我年少輕狂
 
 3 So many, many songs were waiting to be sung
 4 有那麽那麽多甜美的曲兒等我歌唱
 5 So many wild pleasures lay in store for me
 6 有那麽多肆意的快樂等我享受
 7 And so much pain my eyes refused to see
 8 還有那麽多痛苦 我的雙眼卻視而不見
 9 There are so many songs in me that won‘t be sung
10 我有太多歌曲永遠不會被唱起
11 I feel the bitter taste of tears upon my tongue
12 我嘗到了舌尖淚水的苦澀滋味
13 The time has come for me to pay for yesterday
14 終於到了付出代價的時間 為了昨日
15 When I was young
16 當我年少輕狂

修改後文件內容：

 1 Oh, yesterday when I was old
 2 噢 昨日當我年少輕狂
 3 So many, many songs were waiting to be sung
 4 有那麽那麽多甜美的曲兒等我歌唱
 5 So many wild pleasures lay in store for me
 6 有那麽多肆意的快樂等我享受
 7 And so much pain my eyes refused to see
 8 還有那麽多痛苦 我的雙眼卻視而不見
 9 There are so many songs in me that won‘t be sung
10 我有太多歌曲永遠不會被唱起
11 I feel the bitter taste of tears upon my tongue
12 我嘗到了舌尖淚水的苦澀滋味
13 The time has come for me to pay for yesterday
14 終於到了付出代價的時間 為了昨日
15 When I was old
16 當我年少輕狂

Python實踐之路4——實現進度條和文件內容參數替換