用户定义的例外：<不可打印的...对象> [英] User-defined exception: <unprintable ... object>

问题描述

我尝试在python 2.7中定义自己的异常类，该类源自 BaseException 。

I tried to define my own exception class in python 2.7, deriving from BaseException.

class NestedCommentException(BaseException):
    """
    Exception for nested comments
    """
    def __init__(self, file_path, list_lines):
        self.file_path = file_path
        self.list_lines = list_lines

    def __repr__(self):
        return self.__str__()

    def __str__(self):
        return 'File {0} contains nested comments at lines {1}'.format(self.file_path, ', '.join(self.list_lines))

但是将其抛出时无法打印： raise NestedCommentException（file_path，list_lines）触发器

But when throwing it, it cannot be printed: raise NestedCommentException(file_path, list_lines) triggers

Traceback (most recent call last):
  File "D:\DATA\FP12210\My Documents\Outils\SVN\05_impl\2_tools\svn_tag_setup.py", line 85, in <module>
    tag_checks()
  File "D:\DATA\FP12210\My Documents\Outils\SVN\05_impl\2_tools\svn_tag_setup.py", line 66, in tag_checks
    check_nested_comments(ddl_path)
  File "D:\DATA\FP12210\My Documents\Outils\SVN\05_impl\2_tools\svn_tag_setup.py", line 54, in check_nested_comments
    raise NestedCommentException(file_path, list_lines)
NestedCommentException: <unprintable NestedCommentException object>

即使我定义了 __ str __ 和 __ repr __ 方法？

推荐答案

我的猜测是您在 file_path 或 list_lines 变量中具有unicode，因为没有unicode功能的控制台上不会打印它。

My guess is that you have unicode in file_path or list_lines variables dues to which it is not being printed on a console without unicode capabilities.

或 __ str __ 中的任何其他异常都可能导致这种奇怪的行为，最好的方法是捕获异常并查看结果碰巧也要使用调试器

or any other exception in __str__ can cause such strange behavior, best way is to catch exception and see whats is happening, use debugger too

def __str__(self):
    try:
        s =  'File {0} contains nested comments at lines {1}'.format(self.file_path, ', '.join(self.list_lines))
    except Exception,e:
        print "-----",type(e),e
    return s

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