标准库系列：tqdm

目录

• 基本应用
  • 参数
  • 循环体
  • 枚举遍历
  • 多进程

基本应用

参数

iterable=None,
desc=None,      传入str类型，作为进度条标题（类似于说明）
total=None,     预期的迭代次数
leave=True,
file=None, 
ncols=None,         可以自定义进度条的总长度
mininterval=0.1,    最小的更新间隔
maxinterval=10.0,   最大更新间隔miniters=None, ascii=None, unit='it',unit_scale=False, dynamic_ncols=False, smoothing=0.3,bar_format=None, initial=0, position=None, postfix             以字典形式传入 详细信息 例如  速度= 10，

eg:

from tqdm import trange
from random import random, randint
from time import sleep
with trange(100) as t:
    for i in t:
        # Description will be displayed on the left
        t.set_description('下载速度 %i' % i)
        # Postfix will be displayed on the right,
        # formatted automatically based on argument's datatype
        t.set_postfix(loss=random(), gen=randint(1,999), str='详细信息',
                     lst=[1, 2])
        sleep(0.1)

循环体

from tqdm import tqdm
for iIndex in tqdm(range(1000)):
    pass

枚举遍历

from tqdm import tqdm
for iIndex,filename in enumerate(tqdm(jsons)):
    pass

多进程

from tqdm import tqdm
from concurrent.futures import ProcessPoolExecutor
import sys
from colorama import Fore
from joblib import Parallel, delayed

def progress_bar(desc, array):
    return tqdm(array,
            total=len(array),
            file=sys.stdout,
            ascii=' >',
            desc=desc,
            bar_format="%s{l_bar}%s{bar:30}%s{r_bar}" % (Fore.RESET, Fore.BLUE, Fore.RESET))

test = range(int(1e4))

def parallelize(desc, func, array, max_workers):
    return Parallel(n_jobs=max_workers)(delayed(func)(a) for a in progress_bar(desc, array))
   
def identity(x):
    return x

parallelize("", identity, test, 2)