Debugger attribute view for python

Question

is there in python something like a decorator for IDE's or debuggers like IDLE or Visual Studio where I can configure which variable should be written in the variable view for a class?

Example code:

idList = []
idList.append("X342")
idList.append(Token("X9999"))

and the variable view in Visual Studio:

https://i.sstatic.net/q9Q0I.png

Instead of the "Tokens.Token object at (...)" i want to specify in the Token class what the debugger should write. In this case the str "X9999".

Can someone help me?

kindall · Accepted Answer · 2015-03-27 18:29:53Z

2

The debugger almost certainly uses the repr() of the object. You can define your own:

class Token(object):
    def __init__(self, id):
        self.id = id
    def __repr__(self):
        return "<Token %s>" % self.id

If Token is a class from a library, you can subclass it and use the subclass, or if that's not possible, monkey-patch the original class to override its __repr__. The latter looks something like this:

def __repr__(self):
    return "<Token %s>" % self.id   # or wherever `X9999` is stored

Token.__repr__ = __repr__

edited Mar 27, 2015 at 18:29

answered Mar 27, 2015 at 18:07

kindall

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1 Comment

ebaharilikult Over a year ago

Thank you! I only tried it with str() but you're right I should use repr().

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