Combine f-string and raw string literal

python python-3.x f-string
lammyalex picture lammyalex · Oct 9, 2019 · Viewed 13k times · Source

I'm wondering how to use an f-string whilst using r to get a raw string literal. I currently have it as below but would like the option of allowing any name to replace Alex I was thinking adding an f-string and then replacing Alex with curly braces and putting username inside but this doesn't work with the r.

username = input('Enter name')
download_folder = r'C:\Users\Alex\Downloads'

Answer

rajah9 picture rajah9 · Oct 9, 2019

You can combine the f for an f-string with the r for a raw string:

user = 'Alex'
dirToSee = fr'C:\Users\{user}\Downloads'
print (dirToSee) # prints C:\Users\Alex\Downloads

The r only disables backslash escape sequence processing, not f-string processing.

Quoting the docs:

The 'f' may be combined with 'r', but not with 'b' or 'u', therefore raw formatted strings are possible, but formatted bytes literals are not.

...

Unless an 'r' or 'R' prefix is present, escape sequences in string and bytes literals are interpreted...

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