positional arguments:
  src                   source file(s) or directory

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         run with verbose output
  -q, --quiet           run without output
  --no-multiline        convert only single line expressions
  -ll LINE_LENGTH, --line-length LINE_LENGTH
                        for expressions spanning multiple lines, convert only if the resulting single line will fit into the line length limit. Default value is 88 characters.
  -d, --dry-run         Do not change the files in-place and print the diff instead. Note that this must be used in conjunction with '--fail-on-change' when used for linting purposes.
  -s, --string          Interpret the input as a Python code snippet and print the converted version. The snippet must use single quotes or escaped double quotes.
  -tc, --transform-concats
                        Replace string concatenations (defined as + operations involving string literals) with f-strings. Available only if flynt is installed with 3.8+ interpreter.
  -f, --fail-on-change  Fail when changing files (for linting purposes)
  -a, --aggressive      Include conversions with potentially changed behavior.
  -e EXCLUDE [EXCLUDE ...], --exclude EXCLUDE [EXCLUDE ...]
                        ignore files with given strings in it's absolute path.
  --version             Print the current version number and exit.

38f9d3a65222:~ ikkamens$ git clone https://github.com/pallets/flask.git
Cloning into 'flask'...
...
Resolving deltas: 100% (12203/12203), done.

38f9d3a65222:open_source ikkamens$ flynt flask
Running flynt v.0.40

Flynt run has finished. Stats:

Execution time:                            0.789s
Files modified:                            21
Character count reduction:                 299 (0.06%)

Per expression type:
Old style (`%`) expressions attempted:     40/42 (95.2%)
`.format(...)` calls attempted:            26/33 (78.8%)
F-string expressions created:              48
Out of all attempted transforms, 7 resulted in errors.
To find out specific error messages, use --verbose flag.

_-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_._-_.
Please run your tests before commiting. Did flynt get a perfect conversion? give it a star at:
~ https://github.com/ikamensh/flynt ~
Thank you for using flynt. Upgrade more projects and recommend it to your colleagues!

38f9d3a65222:~ ikkamens$

-   repo: https://github.com/ikamensh/flynt/
    rev: ''
    hooks:
    -   id: flynt

foo = (1,)
print('%s' % foo) # prints '1'
print(f'{foo}')   # prints '(1,)'