Python: what is the difference between (1,2,3) and [1,2,3], and when should I use each?

Question

In many places, (1,2,3) (a tuple) and [1,2,3] (a list) can be used interchangeably.

When should I use one or the other, and why?

Answer 1

In simple words, lists are mutable whereas tuples are not. Hence, if you want to modify the elements in your program i.e., adding, deleting or altering elements, go for a list. But, if you don't want tat to happen i.e., may be for setting sequence in for loop, etc. go for a tuple