How to configure an exception message

Question

# python 3.5
>>> class MyError(Exception):
...   pass
...
>>> raise MyError('message')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.MyError: message

I want the exception printed only messageinstead __main__.MyError: message. I tried to identify __str__and __repr__in MyError, and in a metaclass, but it has not affected. Where does the python interpreter get __main__.MyErrorfrom?

Note that I can easily change how instances are printed MyErrorand how they are printed MyError, but none of them affect the exception message:

class MyType(type):
  def __str__(self):
    return '***'

class MyError(Exception, metaclass=MyType):
  def __str__(self):
    return 'xxx'

print(MyError) # ***
print(MyError()) # xxx
raise MyError() # still the same

Answer 1

The closest I could get is:

In [6]: raise MyError("some message")
---------------------------------------------------------------------------
MyError                                   Traceback (most recent call last)
<ipython-input-2-4bd48c5b1ce0> in <module>()
----> 1 raise MyError("some error message")

MyError: some error message

There is a way to remove the text __main__.before the class name. There is even a way to remove the class name, so the output is as follows:

In [6]: raise MyError("some error message")
---------------------------------------------------------------------------
                                          Traceback (most recent call last)
<ipython-input-6-4bd48c5b1ce0> in <module>()
----> 1 raise MyError("some error message")

: some error message

:. , , .

, :

class MyError(Exception):
    __module__ = None
    def __init__(self, *args, **kwargs):
        Exception.__init__(self, *args, **kwargs)
        self.__class__.__name__ = "CustomTextHere"

:

In [8]: MyError
Out[8]: MyError

In [9]: MyError()
Out[9]: None.CustomTextHere()

In [11]: raise MyError()
---------------------------------------------------------------------------
CustomTextHere                            Traceback (most recent call last)
<ipython-input-11-f389ee70e588> in <module>()
----> 1 raise MyError()

CustomTextHere: 

In [12]: raise MyError("some error message")
---------------------------------------------------------------------------
CustomTextHere                            Traceback (most recent call last)
<ipython-input-12-4bd48c5b1ce0> in <module>()
----> 1 raise MyError("some error message")

CustomTextHere: some error message

:, :

self.__class__.__name__ = ""

Answer 2

, , . , :

>>> class MyError(Exception):
...     pass
...
>>> print(type(MyError("message")))
<class '__main__.MyError'>

(, file.py) , file.MyError isntead __main__.MyError. , , python, , , __main__.

, , , , .