【451】python 同一行打印进度条

参考：Python3 Print 同一行打印显示进度条效果

参考：\r\n, \r and \n what is the difference between them? [duplicate]

参考：python的print格式化输出，以及使用format来控制。

实现思路就是不停地删除之前打印的内容，通过 '\r' 实现光标返回最前，之后会覆盖内容，没被覆盖的还会继续显示。

• \r (Carriage Return) → moves the cursor to the beginning of the line without advancing to the next line
• \n (Line Feed) → moves the cursor down to the next line without returning to the beginning of the line — In a *nix environment \n moves to the beginning of the line.
• \r\n (End Of Line) → a combination of \r and \n

import sys,time
 
# 变量
total = 153
 
for i in range(total):

    if i+1 == total:
        percent = 100.0
        print('Progress: %s [%d/%d]'%(str(percent)+'%', i+1, total), end='\n')
    else:
        percent = round(1.0 * i / total * 100,2)
        print('Progress: %s [%d/%d]'%(str(percent)+'%', i+1, total), end='\r') # 将百分号与数字合并起来了
    time.sleep(0.01)

　　上面 % 使用可以参考：【387】Python format 格式化函数（以及 %）

　　下面就是用最普通的方式写的，更好懂

import sys,time
 
# 变量
total = 153
 
for i in range(total):

    if i+1 == total:
        percent = 100.0
        print('Progress: '+str(percent)+'% ['+str(i+1)+'/'+str(total)+']', end='\n')
    else:
        percent = round(1.0 * i / total * 100,2)
        print('Progress: '+str(percent)+'% ['+str(i+1)+'/'+str(total)+']', end='\r')
    time.sleep(0.01)