python添加进度条

from time import sleep
from tqdm import tqdm
for i in tqdm(range(1000)):
    sleep(0.02)

import time
scale = 50
print("执行开始，祈祷不报错".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("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end = "")
 time.sleep(0.1)
print("\n"+"执行结束，万幸".center(scale // 2,"-"))

import sys
import time
def progress_bar():
 for i in range(1, 101):
 print("\r", end="")
 print("Download progress: {}%: ".format(i), "▋" * (i // 2), end="")
 sys.stdout.flush()
 time.sleep(0.05)
progress_bar()