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__repr__ method appears can't be invoked automatically for Exception class


__repr__ method appears can't be invoked automatically for Exception class

By : Abdelkader Html
Date : October 25 2020, 07:10 PM
I hope this helps you . __repr__ is only invoked if e.__str__ resolves to object.__str__, which is basically defined like
code :
def __str__(self):
    return self.__repr__()
>>> e = Exception("hi")
>>> print(e)
hi
>>> str(e)
'hi'
>>> repr(e)
"Exception('hi')"


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Query on __repr__ method of a class in python

Query on __repr__ method of a class in python


By : thibaudse
Date : March 29 2020, 07:55 AM
I wish this help you This happens because you are not explicitly calling any print function in the .py file. In the python interpreter, when you write a sentence, it prints the result immediately after, so it goes into the __repr__ function.
If you do a print statement within your .py code, the string returned by __repr__ will be printed, unless you have implemented the __str__ function, which is more of an "informal" and usually shorter string representation of the object. __repr__ should be a valid python expression, according to the documentation. If no __repr__ or __str__ methods are implemented in your class, by default, python interpreter does not know how to print the contents of your class, so it just prints that: .
Automatically invoke method whenever a class method is invoked?

Automatically invoke method whenever a class method is invoked?


By : Oliver
Date : March 29 2020, 07:55 AM
I wish did fix the issue. This is actually a basic use case for the Template Method design pattern.
code :
abstract class ServiceBase
{
    public bool ServiceMethod()
    {
        if (!CheckMethod())
        {
            return false;
        }

        return ServiceMethodImpl();
    }

    protected abstract bool ServiceMethodImpl();

    private bool CheckMethod()
    {
        // ...
    }
}
class ServiceImpl : ServiceBase
{
    protected override bool ServiceMethodImpl()
    {
        // ...
    }
}
__repr__ for Exception derived class not works well

__repr__ for Exception derived class not works well


By : user3564827
Date : March 29 2020, 07:55 AM
I wish this helpful for you Because MyException is inheriting Exception.__str__, which is what is first consulted by print (because the implicit call is to str(e), which only falls back internally to __repr__ if __str__ doesn't exist.
Curiously, Exception.__str__ returns a blank string:
code :
>>> str(Exception())
''
>>> str(Exception(1))
'1'
>>> str(Exception(None))
'None'
>>> str(Exception(None, True))
'(None, True)'
class MyException(Exception):
    def __repr__(self):
        return "MyException Object"
    __str__ = __repr__
Why is custom exception changed to System.Exception when method invoked via method.invoke()?

Why is custom exception changed to System.Exception when method invoked via method.invoke()?


By : BirgenVH
Date : March 29 2020, 07:55 AM
To fix the issue you can do http://msdn.microsoft.com/en-us/library/4k9x6bc0.aspx
Per the MSDN a TargetInvocationException is thrown if the invoked method or constructor throws an exception.
How to overwrite __repr__ method for an already-instantiated class python

How to overwrite __repr__ method for an already-instantiated class python


By : anica.borromeo
Date : March 29 2020, 07:55 AM
Any of those help @Nullman's answer works, because their solution is actually changing the class object toy, that t is an instance of, not the instance itself, as your approach does.
The special attribute __class__ references the class object an instance belongs to.
code :
print(t.__class__ is toy) # True
def __repr__(self):
    return repr(self.__class__)
<bound method __repr__ of <__main__.toy object at 0x00000000029E5A90>>
<bound method __repr__ of <class '__main__.toy'>>
<bound method inhtoy.__new__.<locals>.__repr__ of <__main__.toy object at 0x7f76e0b61f98>>
def __repr__(self):
    return "Success"

inst.__repr__ = types.MethodType(__repr__, obj)
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