Does python internally overload the "==" when I implement the __cmp__ function in my class, just how we do that in C++ ?
Just curious. I am new to python. :)
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2It's unclear exactly what your question is, but whatever it is the answer is probably here: docs.python.org/2/reference/datamodel.html#special-method-namesBrenBarn– BrenBarn2013-01-21 06:49:10 +00:00Commented Jan 21, 2013 at 6:49
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4 Answers
The meaning of == as used in your Python code changes when you define __cmp__. In this particular sense, the "==-operator" on the Python level is modified by your definition of __cmp__ (note that this is only true if you don't also define __eq__).
But the operator== on the C++ level is not affected by this, for two reasons:
- Python isn't implemented in C++, but in C, and there is no operator overloading
- Python itself isn't recompiled when you write or use your Python code
2 Comments
Deepankar Bajpeyi
By python level is it meant that It will be changed globally ?
jogojapan
@DeepankarBajpeyi No, only in your code (and anything that imports it).
As opposed to what? That's what __cmp__ is for.
Though it's been deprecated for a while, and it's gone in 3 entirely, and you should use __eq__ and friends instead.
Comments
Yes, and likewise with a lot of other operators and methods. There's a full listing in the Python docs.
