文本进度条

#用sleep()模拟
import time
scale = 10
print("----执行开始-----")
for i in range(scale+1):
a = ‘*‘ *i
b = ‘.‘ *(scale-i)
c = (i/scale)*100
print("{:^3.f}%[{}->{}]".format(c,a,b))
time.sleep(0.1)
print("----执行结束-----")


单行动态刷新
不能换行  用后一行覆盖前一行

import time
scale = 50
print("执行开始".center(scale//2,"-"))
start = time.perf_counter()
for i in range(scale+1):
a = ‘*‘ *i
b = ‘.‘ *(scale-i)
c = (i/scale)*100
dur = time.perf_counter()-start
print("{:^3.f}%[{}->{}]{:.2f}s".format(c,a,b,dur).end=‘‘)
time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,‘-‘))

#使用perf_counter()  比较程序运行时间