tldr/pages/common/2to3.md

# 2to3

> Automated Python 2 to 3 code conversion.
> More information: <https://docs.python.org/3/library/2to3.html>.

- Display the changes that would be performed without performing them (dry-run):

`2to3 {{path/to/file.py}}`

- Convert a Python 2 file to Python 3:

`2to3 --write {{path/to/file.py}}`

- Convert specific Python 2 language features to Python 3:

`2to3 --write {{path/to/file.py}} --fix {{raw_input}} --fix {{print}}`

- Convert all Python 2 language features except the specified ones to Python 3:

`2to3 --write {{path/to/file.py}} --nofix {{has_key}} --nofix {{isinstance}}`

- List all available language features that can be converted from Python 2 to Python 3:

`2to3 --list-fixes`

- Convert all Python 2 files in a directory to Python 3:

`2to3 --output-dir {{path/to/python3_directory}} --write-unchanged-files --nobackups {{path/to/python2_directory}}`

- Run 2to3 with multiple threads:

`2to3 --processes {{4}} --output-dir {{path/to/python3_directory}} --write --nobackups --no-diff {{path/to/python2_directory}}`