[terminal]关于进度条的学习

在PowerShell中隐藏光标

在pip的源码C:\Python36\Lib\site-packages\pip\utils\ui.py中发现了:

 1 @contextlib.contextmanager
 2 def hidden_cursor(file):
 3     # The Windows terminal does not support the hide/show cursor ANSI codes,
 4     # even via colorama. So don't even try.
 5     if WINDOWS:
 6         yield
 7     # We don't want to clutter the output with control characters if we're
 8     # writing to a file, or if the user is running with --quiet.
 9     # See https://github.com/pypa/pip/issues/3418
10     elif not file.isatty() or logger.getEffectiveLevel() > logging.INFO:
11         yield
12     else:
13         file.write(HIDE_CURSOR)
14         try:
15             yield
16         finally:
17             file.write(SHOW_CURSOR)

原本都打算放弃了, 次日在windows上PowerShell中一试竟然能够

具体HIDE_CURSOR的代码在C:\Python36\Lib\site-packages\pip\_vendor\progress\helpers.py文件中

1 HIDE_CURSOR = '\x1b[?25l'
2 SHOW_CURSOR = '\x1b[?25h'

跟进度条的斗争, 从sys.stdout.write()和sys.stdout.flush(), 到progressbar2, 再到tqdm, 再到以后由于tqdm在jupyter notebook中好看, 因而折腾anaconda, 最终试着研究tqdm源码, 发现ascii参数, 再到研究pip源码,着实学到很多, 不过像本少这种门外少年, 仍是须要时间慢慢来, 才能接受看源码的设定. 苦笑...

最后附上我的定制进度...称不上条了....

 

 1 #!/usr/bin/env python3
 2 # -*- coding: UTF-8 -*-
 3 __author__ = "Sigai"
 4 
 5 # 9733, 9734
 6 from collections import deque
 7 import sys
 8 from time import sleep
 9 
10 d = deque([9733, 9734, 9733, 9734, 9733, 9734])
11 HIDE_CURSOR = '\x1b[?25l'
12 SHOW_CURSOR = '\x1b[?25h'
13 sys.stdout.write(HIDE_CURSOR)
14 while 1:
15     sys.stdout.write(f"\033[91m{''.join(chr(i) for i in d)}\033[0m")
16     sys.stdout.flush()
17     sys.stdout.write("\r")
18     sys.stdout.flush()
19     d.rotate(1)
20     sleep(.3)
21 sys.stdout.write(SHOW_CURSOR)

 

最新发现: https://my.oschina.net/jcseg/blog/178047

因而更改tqdm源码 _tqdm.py  实现彩色进度条, 实现jupyter notebook中相似的进度条咯~~

1             # format bar depending on availability of unicode/ascii chars
2             if ascii:
3                 bar_length, frac_bar_length = divmod(
4                     int(frac * N_BARS * 10), 10)
5 
6                 bar = '\033[42m \033[0m' * bar_length
7                 frac_bar = chr(48 + frac_bar_length) if frac_bar_length \
8                     else ' '

更改源码中第416行的'#' 为上面第6行的仿真终端代码

愿望达成~~~

想去github提交下, 不过我是win10系统, cmd, powershell都有效果, 没试过别的平台

仍是之后更厉害再去贡献吧...

2017.11.06 更新----------------------------------

早上看流畅的python中提到python环境变量PYTHONIOENCODING的设置, 心想会不会能够简单实现, 但是windows设置了环境变量并无用, 但是tqdm能够输出正确的终端控制字符.

这就让我抓狂了, 因此反正无聊, 继续翻tqdm源码, 实验过程当中发现 执行一次tqdm的进度条以后, cmd和powershell就能够正确输出终端控制字符了, WTF, tqdm确定干了什么!!!

因此看trang, 发现是tqdm的shotcut而已, 只能从头看_tqdm部分了, 最后发现它import了colorama模块并且还执行了init的函数, 这TM确定有事儿啊!

就去这个模块的PyPi看了一下, 果真init()以后就能够执行终端控制了.....但是如今只能到这了 init里面干的事太多了, 看不懂.目前能够简单利用了

1 python -c "from colorama import init;init();print('\033[42m \033[0m')"

 

2017.12.14 更新---------------------------------

脚本运行完成, 发出蜂鸣提示功能

1 import winsound
2 winsound.Beep(2015, 3000)

 

美剧<黑客军团>第一季第一集中破解心理医生那段实际上是python脚本...一段打印颜色字符的代码很不错.

 1 class bcolors:
 2     HEADER = '\033[95m'
 3     OKBLUE = '\033[94m'
 4     OKGREEN = '\033[92m'
 5     WARNING = '\033[93m'
 6     FAIL = '\033[91m'
 7     ENDC = '\033[0m'
 8     BOLD = '\033[1m'
 9     UNDERLINE = '\033[4m'
10  
11 prompt = bcolors.OKBLUE + 'root@elliot:' + bcolors.ENDC + ' '
12 
13 print(prompt + 'ping (222.12.154.102)')

学习一下 https://ideone.com/R8VuQp

 发现控制终端输出颜色已经有固定模式了

class INFO:
    HEADER = '\033[95m'
    OKBLUE = '\033[94m'
    OKGREEN = '\033[92m'
    WARNING = '\033[93m'
    ARNING = '\033[93m'
    FAIL = '\033[91m'
    ENDC = '\033[0m'
    BOLD = '\033[1m'
    UNDERLINE = '\033[4m'

    def __init__(self):
        self.SUCCESS = self.OKGREEN + self.BOLD + 'Found SUCCESS!' + self.ENDC
        self.FAILED = self.FAIL + self.BOLD + 'Found FAILED!' + self.ENDC

http://www.freebuf.com/articles/web/127888.html

 python的colorama可实现跨平台