python tuples: unpacking into a list using *args

Question

Hello and thanks for your time;

I am using *args to take various arguments, which creates a tuple. How do I 'unpack' a tuple into a list? The following code appends the list with a tuple.

grades = [] def add_grades(*args): grades.append(args): return grades print(add_grades(99,88,77))

I can do this using a for loop and iterating through the tuple, but looking to see if I can unpack directly.

I could, but this just creates a list, whereas I already have a list created and trying to append values. — JulienEast
– JulienEast, Commented Feb 16, 2020 at 19:08
Ah, you’re trying to append multiple values, I misunderstood. — AMC
– AMC, Commented Feb 16, 2020 at 19:09
Might this be a duplicate of stackoverflow.com/questions/3274095/append-tuples-to-a-list ? — AMC
– AMC, Commented Feb 16, 2020 at 19:10
The question is slightly confusing, but the accepted answer is just list.extend(). — AMC
– AMC, Commented Feb 16, 2020 at 19:13

blhsing · Accepted Answer · 2020-02-16 18:51:39Z

5

You can use the list.extend method instead:

def add_grades(*args): grades.extend(args): return grades

answered Feb 16, 2020 at 18:51

blhsing

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Comments

Guy · Accepted Answer · 2020-02-16 19:58:23Z

To convert the tuple to list you can return *args as list and extend the existing list

grades = [] def add_grades(*args): return [*args] grades.extend(add_grades(99,88,77))

Note that you can extend the list with tuple as well

def add_grades(*args): return args grades.extend(add_grades(99,88,77))

If you don't do anything else in add_grades you can also do it without any function

grades.extend([99,88,77])

Thanks - it seems that extend() takes any tuple arguments and adds them to a list, which was what I was looking for (and included in the two first answers)

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