what does tqdm do ? code example

Example 1: tqdm description

from tqdm import trange
from time import sleep
t = trange(100, desc='Bar desc', leave=True)
for i in t:
    t.set_description("Bar desc (file %i)" % i)
    t.refresh() # to show immediately the update
    sleep(0.01)

Example 2: tqdm description

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

Example 3: tqdm description

from tqdm import tqdm
pbar = tqdm(["a", "b", "c", "d"])
num_vowels = 0
for ichar in pbar:
    if ichar in ['a','e','i','o','u']:
        num_vowels += 1
    pbar.set_postfix({'num_vowels': num_vowels})