python进度条使用tqdm不停留在一条线上

Question

我正在尝试运行一个脚本,试图通过puppet管理在centos7系统上安装模块.我想为运行脚本时发生的安装实现进度条.我正在使用tqdm模块来执行此操作.这是我如何实现模块的一个快照:

from tqdm import tqdm
for i in tqdm(commands):
    res = run_apply(i)

这里run_apply()是实际处理运行和应用puppet配置的函数.

到目前为止一切顺利,我得到了一个进度条,但是当执行消息写入控制台时,它一直向下移动到控制台.但是,我需要进度条在控制台的底部保持不变并动态更新,而不会使运行消息干扰条形码.我希望控制台上与执行相关的消息可以随心所欲地进行,但进度条应该从执行开始到结束时保持在底部.

以下是我所看到的:

        File line: 0.00
          Package: 0.05
          Service: 0.19
             File: 0.23
             Exec: 0.23
         Last run: 1470308227
   Config retrieval: 3.90
            Total: 4.60
Version:
           Config: 1470308220
           Puppet: 3.7.3
now here x
result:  2
 38%|??????????????????????????????????????                                                            | 5/13 [00:29<00:51,  6.44s/it]about to:  profiles::install::download_packages
about to run puppet apply --summarize  --detailed-exitcodes --certname puppet -e "include profiles::install::download_packages"
Error: Could not find class profiles::install::download_packages for puppet on node puppet
Error: Could not find class profiles::install::download_packages for puppet on node puppet
now here x
result:  1
 46%|??????????????????????????????????????????????                                                    | 6/13 [00:32<00:36,  5.27s/it]about to:  profiles::install::install
about to run puppet apply --summarize  --detailed-exitcodes --certname puppet -e "include profiles::install::install"
Error: Could not find class profiles::install::install for puppet on node puppet
Error: Could not find class profiles::install::install for puppet on node puppet
now here x
result:  1
 54%|?????????????????????????????????????????????????????                                             | 7/13 [00:34<00:26,  4.45s/it]about to:  stx_network
about to run puppet apply --summarize  --detailed-exitcodes --certname puppet -e "include stx_network"
Notice: Compiled catalog for puppet in environment production in 0.84 seconds
Notice: /Stage[main]/Stx_network/Tidy[purge unused nics]: Tidying File[/etc/sysconfig/network-scripts/ifcfg-lo]
...  

请让我知道如何实现我想要的.

Answer 1

对于要在进度条上方打印的消息,您需要向tqdm发信号通知您正在打印消息(否则tqdm,也没有任何其他进度条,无法知道您在进度条旁边输出消息).

为此,您可以使用tqdm.write(msg)而不是打印您的消息print(msg).如果您不想修改run_apply()使用tqdm.write(msg)而不是print(msg),则可以通过tqdm从顶级脚本重定向所有标准输出,如此处所述.