Why send `self` in the user specified callbacks as the first argument?

RandomTrader

Hello Team,

Why do you send the self in the User specified callbacks which have been monkey-patched to the for ex self.on_close methods of the class KiteTicker? Such as mentioned below :-

For example :


def _on_error(self, ws, code, reason):
if self.on_error:
self.on_error(self, code, reason) # <--- Here, shouldn't self be replaced with ws


Shouldn't the self being send in the last line of the above code be replaced with ws, The WebSocket object? Because according to my understanding you are basically sending the KiteTicker object back in the first argument which is ws as mentioned in the callbacks functions)

(BTW, how do you insert code here? The above was best i could manage... )

RandomTrader

Correct me if i am wrong, i think the use of ws in your examples callbacks is just a naming convention that you chose to take, although it has nothing to do with self.ws = self.factory.ws which is an alias for the actual websocket in the KiteTicker class?

Am i correct?

DD1365

You can use the above functions in Python, my code uses them daily and its working perfectly fine. (In the on_close function use 'raise SystemExit' only if you want to exit your code.)

RandomTrader

Ohh thanks @DD1365 for your answer.
My query was to understand the code, rather than just being able to use it.

But once again thanks for your time

DD1365

If you want to understand the code then first thing that you should keep in mind is that Python KiteConnect is just a wrapper which helps us to use Python to place API calls.

The base API is coded in a lower level language, and 'self' is a part of the wrapping process. You can go through the repositories for KiteConnect and KiteTicker classes (link shared below) and you will observe that 'self' method is present in each API call function.

https://github.com/zerodha/pykiteconnect/blob/master/kiteconnect/connect.py
https://github.com/zerodha/pykiteconnect/blob/master/kiteconnect/ticker.py

RandomTrader

Thanks