from tqdm import tqdm
import time
text = ""
for char in tqdm(["a", "b", "c", "d"]):
 text = text + char
 time.sleep(0.5)

trange(i) 是对tqdm(range(i)) 特殊优化过的实例：

from tqdm import trange
import time
for i in trange(100):
 time.sleep(0.1)

from tqdm import tqdm
import time
pbar = tqdm(["a", "b", "c", "d"])
for char in pbar:
 pbar.set_description("Processing %s" % char)
 time.sleep(0.5)

from tqdm import tqdm
import time
with tqdm(total=100) as pbar:
 for i in range(10):
  pbar.update(10)
  time.sleep(0.5)

from tqdm import tqdm
import time
pbar = tqdm(total=100)
for i in range(10):
 pbar.update(10)
 time.sleep(0.5)
pbar.close()

import tqdm
import time
def _foo(my_number):
 square = my_number * my_number
 time.sleep(1)
 return square 
if __name__ == '__main__':
 with Pool(2) as p:
  r = list(tqdm.tqdm(p.imap(_foo, range(30)), total=30))