=- and -= snag

[Morten W. Petersen]

Hi.

I was working in Python today, and sat there scratching my head as the
numbers for calculations didn't add up.  It went into negative numbers,
when that shouldn't have been possible.

Turns out I had a very small typo, I had =- instead of -=.

Isn't it unpythonic to be able to make a mistake like that?

Regards,

Morten

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