Passing an argument into a operate also binds a name (the parameter title of your operate) to an object.
From the code revealed in the dilemma, the statement self.Modify(self.variable) binds the name var (inside the scope of purpose Transform) to the article that holds the value 'Initial' and also the assignment var = 'Transformed' (in the body of function Improve) assigns that very same name all over again: to Several other object (that happens to carry a string as well but might have been something else entirely).
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As an extra, unrealted Take note, I would express that employing a string comparison perform in this kind of harmful trend (it modifies
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Level staying, I don't concur that it is a hack (which I just take to signify to make reference to a thing that operates but for factors unidentified, untested, or unintended by the implementer).
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The real key to comprehension parameter passing is to stop pondering "variables". You will find names and objects in Python and jointly they
A lot of insights in responses below, but i think an additional level is just not Plainly mentioned listed here explicitly. Quoting from python documentation "In Python, variables that are only referenced inside a purpose are implicitly global.
If you actually needed to steer clear of utilizing a return worth, you could produce a class to hold your price and pass it into your function or use an existing course, similar to a record:
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Even though passing a mutable item into a find more information functionality this even now applies. And to me Plainly explains The explanation for the difference in habits in between assigning to the item and functioning on the thing during the perform.
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