A backport of fstrings to python<3.6
Project description
future-fstrings
A backport of fstrings to python<3.6.
Installation
pip install future-fstrings
Usage
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 world
Showing 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)))
How does this work?
future-fstrings has two parts:
- A utf-8 compatible
codecwhich performs source manipulation- The
codecfirst decodes the source bytes using the UTF-8 codec - The
codecthen leverages tokenize-rt to rewrite f-strings.
- The
- A
.pthfile which registers a codec on interpreter startup.
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