this library is no longer needed:
A backport of fstrings to python<3.6.
pip install future-fstrings
Include the following encoding cookie at the top of your file (this replaces the utf-8 cookie if you already have it):
# -*- coding: future_fstrings -*-
And then write python3.6 fstring code as usual!
# -*- coding: future_fstrings -*-
thing = 'world'
print(f'hello {thing}')
$ python2.7 main.py hello worldShowing transformed source
future-fstrings also includes a cli to show transformed source.
$ future-fstrings-show main.py
# -*- coding: future_fstrings -*-
thing = 'world'
print('hello {}'.format((thing))) Transform source for micropython
The future-fstrings-show command can be used to transform source before distributing. This can allow you to write f-string code but target platforms which do not support f-strings, such as micropython.
To use this on modern versions of python, install using:
pip install future-fstrings[rewrite]
and then use future-fstrings-show as above.
For instance:
future-fstrings-show code.py > code_rewritten.py
future-fstrings has two parts:
codec which performs source manipulation
codec first decodes the source bytes using the UTF-8 codeccodec then leverages tokenize-rt to rewrite f-strings..pth file which registers a codec on interpreter startup.site registration
in setups (such as aws lambda) where you utilize PYTHONPATH or sys.path instead of truly installed packages, the .pth magic above will not take.
for those circumstances, you'll need to manually initialize future-fstrings in a non-fstring wrapper. for instance:
import future_fstrings
future_fstrings.register()
from actual_main import main
if __name__ == '__main__':
raise SystemExit(main())
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