Using format instead of f string

Question

I have python 3.7.4 and it has f string support. But the server I am porting my data has python < 3.6 and so does not support f string. The following code works fine in local machine:

directory_root = 'dataset_test/'

root_dir = listdir(directory_root)
for animal_folder in root_dir:
        animal_folder_list = listdir(f"{directory_root}/{animal_folder}")

But this code fails in server as it does not support f string. How could I rewrite it using format ?

I suggest reading and following the `str.format()` documentation. It never fails. — DYZ, Mar 13 '20 at 05:48
@DYZ I have read the documentation but couldn't work it out. Thank you — John, Mar 13 '20 at 06:00

score 1 · Accepted Answer · answered Mar 13 '20 at 05:50

1

You can write it like this:

listdir("{directory_root}/{animal_folder}".format(directory_root=directory_root, animal_folder=animal_folder))

Or

listdir("{}/{}".format(directory_root, animal_folder))

answered Mar 13 '20 at 05:50

Mushif Ali Nawaz

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score 0 · Answer 2 · answered Mar 13 '20 at 05:58

0

You can simply use string formatting like following "Your string {0} {1}...{}".format(variable1, variable2, variable)

answered Mar 13 '20 at 05:58

Rajat Jog

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score 0 · Answer 3 · answered Mar 13 '20 at 05:58

The correct way, that works in every environment, not only on your local linux box would be:

animal_folder_list = listdir(os.path.join( directory_root, animal_folder))

When you explicitly specify folder separator (/), it will break on Win-boxes or in other hostile environments. os.path.join() comes to the rescue =)

Using format instead of f string

3 Answers3