Saving a for loop output into a variable

Question

For example given the following for loop:

for i in range(3):
    print(i, '->',i+1)

Gives the output:

0 -> 1
1 -> 2
2 -> 3

How could I save this output in string form such that it is saved in a variable.

So for example could say print(my_variable) and the output is as the above output.

Edit Given the following list:

[['ORGANIZATION', 'EDUCATION', 'UniversityWon', 'FormMathematics'], ['PERSON', 'Sixth', 'Economics'], ['GPE', 'FrenchUK', 'London']]

I have the following for loop that prints them in the desired way:

for i in output:
    print(i[0], '->', ', '.join(i[1:]))

Output of:

ORGANIZATION -> EDUCATION, UniversityWon, FormMathematics
PERSON -> Sixth, Economics
GPE -> FrenchUK, London

How can i save this output into a variable such that if i executed print(variable), the above output would be printed?

Sound like an x/y problem. Could you edit your post with some details about why you want to do this? — 0stone0
– 0stone0, Commented Mar 10, 2022 at 16:18
That would require a lot of other code which doesn't really add explanation to the problem at hand. — daniel stafford
– daniel stafford, Commented Mar 10, 2022 at 16:18
you may be looking for string interpolation, which is often done with an f-string or the .format() method — ti7
– ti7, Commented Mar 10, 2022 at 16:19

Chris · Accepted Answer · 2022-03-10 16:20:51Z

1

A list comprehension can be used to generate the individual strings.

[f"{i} -> {i + 1}" for i in range(3)]

We can then join those with newlines.

"\n".join([f"{i} -> {i + 1}" for i in range(3)])

But we don't need to use a list comprehension here. A generator expression will be more efficient as it doesn't generate an entire list first and then iterate over that list.

"\n".join(f"{i} -> {i + 1}" for i in range(3))

If every line need to end in a newline, you can factor that into the f-string and then join them with an empty string.

''.join(f"{i} -> {i + 1}\n" for i in range(3))

answered Mar 10, 2022 at 16:20

Chris

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3 Comments

daniel stafford Over a year ago

Thanks for the help, i have updated the question if you could take a look that would be great.

Chris Over a year ago

The concepts already shown can be used to accomplish that additional task.

daniel stafford Over a year ago

I am not sure how to include the join within {} since this throws an error

Richard · Accepted Answer · 2022-03-10 16:21:05Z

0

You can use an f-string like this:

result = ""

for i in range(3):
    result += f"{i} -> {i + 1}\n"

print(result)

answered Mar 10, 2022 at 16:21

Richard

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1 Comment

daniel stafford Over a year ago

Thanks for the help, i have updated the question if you could take a look that would be great.

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