How to write this function in one line of code?

Question

I have this code that converts all int elemets of a list to strings:

def convert(x):
    for i in range(0, len(x)):
        x[i] = str(x[i])
    return x

How can I write the function in only one line, using map()?

Tried writing the for loop in one line but it doesn't seem to work.

@Lecdi [Avoid named lambdas](/q/38381556/4518341), use a `def` instead. I realize you're answering the question literally, but it's still bad practice. — wjandrea, Oct 25 '22 at 16:10
Why are you both modifying `x` and returning `x`? [That's confusing and could easily cause bugs](/q/13062423/4518341). And it seems like it's not intentional because you accepted an answer that doesn't modify `x`. Please [edit] to clarify. While you're editing, please add details to the title, something like "How do I convert a list of ints to strings in one line?" [ask] has tips on writing a good title. — wjandrea, Oct 25 '22 at 16:24

score 4 · Accepted Answer · edited Oct 25 '22 at 16:11

4

Probably the shortest way:

def convert(x):
    return list(map(str, x))

edited Oct 25 '22 at 16:11

wjandrea

answered Oct 25 '22 at 16:00

Matei Piele

How to use the map() function? – ianikdobrevser Oct 26 '22 at 07:47
1

It has two parameters: function (the function to be applied on an iterable) and iterable (the iterable you want to apply the function on) – Matei Piele Oct 26 '22 at 07:52

score 3 · Answer 2 · answered Oct 25 '22 at 15:57

3

You can use a list comprehension:

def convert(x):
    return [str(i) for i in x]

answered Oct 25 '22 at 15:57

Fastnlight

That's two lines – Lecdi Oct 25 '22 at 15:58
1

I am assuming the function definition doesn’t count as a line. – Fastnlight Oct 25 '22 at 16:00
That's a nit-picky thing to flag. You can inline the contents of `convert` here anywhere it's called and it's one line. – Nathaniel Ford Oct 25 '22 at 16:00

surge10 · Answer 3 · 2022-10-25T16:01:20.523

2

Here

def convert(x):
    return [str(y) for y in x]

edited Oct 25 '22 at 16:01

answered Oct 25 '22 at 16:00

surge10

score 2 · Answer 4 · answered Oct 25 '22 at 16:00

2

Using list comprehension

ints = [1, 2, 3]
result = [str(x) for x in ints]
print(result)

>> ['1', '2', '3']

answered Oct 25 '22 at 16:00

RuntimeError

4 Answers4