Serhiy Storchaka <> added the comment:

The string prefix u is used exclusively for compatibility with Python 2. It 
helps writing code that works in Python 2 and Python 3. The string prefix f is 
not compatible with Python 2. If you use it, you no longer have reasons for 
using the string prefix u.

nosy: +serhiy.storchaka
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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