FAQ: Introduction to Functions - Review


This community-built FAQ covers the “Review” exercise from the lesson “Introduction to Functions”.

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Data Science

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Hi there, quick question!

I understand that with the ‘lyrics’ variable we over-road the number 10 in the function and therefore “Row” appeared 3 times. I’m just wondering what part of the code told “print” to display the whole function 10 times?


lyrics = repeat_stuff("Row ", 3) + "Your Boat. "
runs the function giving two arguments, therefore overwriting the 10.

The second step
song = repeat_stuff(lyrics)
runs the function again but this time you’re not overwriting the default num_repeats argument of 10 since you’re not giving a second argument.


I think that when we put (“row”, 3) it defines num_repeats as 3, but when we put just (lyrics) with out any specified number, it used the defined default of 10 applied in step four. I think.


Hi guys,

I’m currently stuck at sub exercise 2. which states

Outside of the function, call repeat_stuff .

You can use the value "Row " for stuff and 3 for num_repeats .

what does that translate into python ?

I can’t seem to get it to greenlight it to move to step 3.


Make sure you put the space behind “Row” so that it is "Row ".


Make sure your code is not indented two spaces for this line:

repeat_stuff("Row ", 3)


Hey, thanks for the help!


Why is it that when you define the variable lyrics without the 10 being default it won’t run even though in lyrics we defined both positional arguments?


num_repeats will be 10 if we do not supply a second positional argument.

lyrics = repeat_stuff("Row ") + "Your Boat\n"
Row Row Row Row Row Row Row Row Row Row Your Boat

If we supply no arguments it will raise an exception.

TypeError: repeat_stuff() missing 1 required positional argument: 'stuff'

If we supply a number in the first position, it will also raise an exception:

TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’

Note that we are building lyrics before passing it to create song.

Row Row Row your boat

is the lyrics,

Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat
Row Row Row Your Boat

is the song, as in,

song = repeat_stuff(lyrics)