Fix Python – What does [:] mean?


Asked By – andriy

I’m analyzing some Python code and I don’t know what

pop = population[:]

means. Is it something like array lists in Java or like a bi-dimensional array?

Now we will see solution for issue: What does [:] mean?


It is an example of slice notation, and what it does depends on the type of population. If population is a list, this line will create a shallow copy of the list. For an object of type tuple or a str, it will do nothing (the line will do the same without [:]), and for a (say) NumPy array, it will create a new view to the same data.

This question is answered By – Sven Marnach

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