python脚本进度条

1. 定义进度条

  from tqdm import tqdm

def tqdmWrapViewBar(*args, **kwargs):
    pbar = tqdm(*args, **kwargs)  # make a progressbar
    last = [0]  # last known iteration, start at 0

    def viewBar(a, b):
        pbar.total = int(b)
        pbar.update(int(a - last[0]))  # update pbar with increment
        last[0] = a  # update last known iteration
    return viewBar, pbar  # return callback, tqdmInstance

2. 实例化进度条

cbk, pbar = tqdmWrapViewBar(ascii=True, unit='b', unit_scale=True)

3. 使用进度条

def sftp_down_file(host, logfile):
    try:
        t = paramiko.Transport((host, 22))
        t.connect(username="root", pkey=pkfile)
        sftp = paramiko.SFTPClient.from_transport(t)
        sftp.get(logfile, "456.txt", callback=cbk) #使用回调函数展示进度条
        t.close()
    except Exception as e:
        print(e)