Python - Function argument with a comma [duplicate]

Question

I want to have an argument in a function that fills an array with multiple strings, so that i have

def Test(colors):
     colorarray = [colors]

which i can fill with

Test(red,blue)

but i always get either the takes 2 positional arguments but 3 were given error or the single strings do not get accepted (e.g. TurtleColor(Color[i]) tells me "bad color string: "red","blue")

i know i can pass the strings as seperate arguments, but i kind of want to avoid having that many different arguments.

You say TurtleColor(Color[i]) throws a bad color string: "red","blue" error, but what are TurtleColor and Color and i? — Aran-Fey
– Aran-Fey, Commented May 7, 2018 at 13:48
See this question if you need to convert the *args tuple to a list. — Aran-Fey
– Aran-Fey, Commented May 7, 2018 at 13:49

anishtain4 · Accepted Answer · 2018-05-07 13:48:30Z

3

You need to read input arguments as a list

   def Test(*colors):
         colorarray = [*colors]
         print(colorarray)

    Test('red','blue')

answered May 7, 2018 at 13:48

anishtain4

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6 Comments

Flying Thunder Over a year ago

That should work, what do i do if i have a second argument? e.g. def Test(*colors,size): and entering Test('red','blue',100) didnt work - told me it required a keyword-only argument: 'size' EDIT: Test('red','blue',size=100) does work. unsatisfying though, wonder if i can spare that "size=" with some syntax

anishtain4 Over a year ago

@FlyingThunder: If the size is always there just change the order! Test(size,*colors)

Flying Thunder Over a year ago

so the list has to come last, that shouldnt be a problem - i hope i dont stumble across a case where i have to input multiple lists then. thanks for quick advice

Aran-Fey Over a year ago

list(colors) would be more readable and more backwards compatible than [*colors].

anishtain4 Over a year ago

Aran is right, an alternative is to input colors as a single list argument that keeps your code cleaner (specially if you have multiple arguments). However instead of a list (which is mutable) I suggest to use tuples: def Test(colors,size), and call it Test(('red','blue'),100)

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