f2format 0.1.0b2

Convert f-string to str.format for Python 3 compatibility.

f2format

  Since PEP 498, Python introduced f-string literal in version 3.6. Though released ever since December 23, 2016, Python 3.6 is still not widely used as expected. For those who are now used to f-string, f2format provides an intelligent, yet imperfect, solution by converting f-strings to str.format literals.

  f2format is inspired and assisted by my mate @gousaiyang. It functions by tokenising and parsing Python code into multiple abstract syntax trees (AST), through which it shall synthesise and extract expressions from f-string literals, and then reassemble the original string using str.format method. Besides conversion and format specification, f2format also considered and resolved string concatenation. Also, it always tries to maintain the original layout of source code, and accuracy of syntax.

Installation

Note that f2format only supports Python versions since 3.6

  Simply run the following to install the current version from PyPI:

pip install f2format

  Or install the latest version from the git repository:

git clone https://github.com/JarryShaw/f2format.git
cd f2format
pip install -e .
# and to update at any time
git pull

Usage

  It is fairly straightforward to use f2format:

f2format 0.1.0
usage: f2format [-h] [-n] <python source files and folders..>

Convert f-string to str.format for Python 3 compatibility.

options:
    -h      show this help message and exit
    -n      do not archive original files

  f2format will read then convert all f-string literals in every Python file under this path. In case there might be some problems with the conversion, f2format will duplicate all original files it is to modify into archive directory ahead of the process, if -n not set.

Contribution

  Contributions are very welcome, especially fixing bugs and providing test cases, which @gousaiyang is to help with, so to speak. Note that code must remain valid and reasonable.