在终端上从Python着色异常 [英] Coloring exceptions from Python on a terminal

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本文介绍了在终端上从Python着色异常的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

有没有简单的方法来获取在命令行上着色的异常的消息?例如

  def g():f()
def f():1/0
g ()

产生错误

 跟踪(最近一次调用):
文件test.py,第3行,在< module>
g()
文件test.py,第1行,在g
中def g():f()
文件test.py,第2行,在f
def f():1/0
ZeroDivisionError:以零为整数除数或模数

我想整数除法或零除数在终端上着色或突出显示,以便我可以从长回溯(仅限Linux)中快速选择它。理想情况下,我不想为每个异常编写一个自定义类,而是以某种方式捕获和格式化所有类型。



编辑链接在注释中给出了如何使用外部软件解决问题的示例,但我对一个内部Python解决方案感兴趣。

解决方案

您可以将自定义函数分配给 sys.excepthook 处理程序

 这个函数会被调用, import sys 

def myexcepthook(type,value,tb):
import traceback
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments .formatters import TerminalFormatter

tbtext =''.join(traceback.format_exception(type,value,tb))
lexer = get_lexer_by_name(pytb,stripall = True)
formatter = TerminalFormatter()
sys.stderr.write(highlight(tbtext,lexer,formatter))

sys.excepthook = myexcepthook
pre>

此版本使用 pygments 将跟踪文本转换为格式为ANSI颜色的文本,然后再将其写入 stderr


Is there an easy way to get the message of the exception to be colored on the command line? For example

def g():    f()
def f():    1/0
g()

Gives the error

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    g()
  File "test.py", line 1, in g
    def g():    f()
  File "test.py", line 2, in f
    def f():    1/0
ZeroDivisionError: integer division or modulo by zero

I would like "integer division or modulo by zero" to be colored or highlighted on the terminal so that I can quickly pick it out of a long traceback (Linux only). Ideally, I wouldn't want to write a custom class for each Exception, but somehow catch and format all kinds.

EDIT: The question linked in the comments gives examples on how to solve the problem with external software, but I'm interested in an internal Python solution.

解决方案

You can assign a custom function to the sys.excepthook handler. The function is called whenever there is a unhandled exception (so one that exits the interpreter).

import sys

def myexcepthook(type, value, tb):
    import traceback
    from pygments import highlight
    from pygments.lexers import get_lexer_by_name
    from pygments.formatters import TerminalFormatter

    tbtext = ''.join(traceback.format_exception(type, value, tb))
    lexer = get_lexer_by_name("pytb", stripall=True)
    formatter = TerminalFormatter()
    sys.stderr.write(highlight(tbtext, lexer, formatter))

sys.excepthook = myexcepthook

This version uses the pygments library to convert the traceback text into one formatted with ANSI coloring, before writing it to stderr.

这篇关于在终端上从Python着色异常的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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