Python 3.8.5 : Testing the pyre tool - part 001.

The Pyre is a static analysis tool to detect and prevent security issues in Python code that can be found on the official website.
The Pyre tool supports the Language Server Protocol and has an extension for VSCode.
The team development comes at August 7, 2020, with this intro:
Pyre is a performant type checker for Python. Statically typing what are essentially fully dynamic languages has a long tradition at Facebook. We've done this for PHP with Hack and for Javascript with Flow.
The install is easy to do with pip tool:

[mythcat@desk ~]$ pip install pyre-check
Defaulting to user installation because normal site-packages is not writeable
Collecting pyre-check
  Using cached pyre_check-0.0.52-py3-none-manylinux1_x86_64.whl (22.9 MB)
...
Installing collected packages: pyre-check
Successfully installed pyre-check-0.0.52

If you want to use a virtual environment:

[mythcat@desk ~]$ mkdir my_project && cd my_project
[mythcat@desk my_project]$ python3 -m venv ~/.venvs/venv
[mythcat@desk my_project]$ source ~/.venvs/venv/bin/activate
(venv) [mythcat@desk my_project]$ pip install pyre-check
Collecting pyre-check
...
(venv) [mythcat@desk my_project]$ pyre init
 ƛ Which directory should pyre be initialized in? (Default: `.`): 
(venv) [mythcat@desk my_project]$ cat .pyre_configuration
{
  "binary": "/home/mythcat/.venvs/venv/bin/pyre.bin",
  "source_directories": [
    "."
  ],
  "taint_models_path": "/home/mythcat/.venvs/venv/lib/pyre_check/taint/",
  "typeshed": "/home/mythcat/.venvs/venv/lib/pyre_check/typeshed/"
}
(venv) [mythcat@desk my_project]$ ls .pyre
my_project  pid_files  pyre.stderr
(venv) [mythcat@desk my_project]$ pyre
 ƛ No watchman binary found. 
To enable pyre incremental, you can install watchman: https://facebook.github.io/watchman/docs/install
 ƛ Defaulting to non-incremental check.
 ƛ No type errors found

Let's test with the default example from documentation:

(venv) [mythcat@desk my_project]$ echo "i: int = 'string'" > test.py
(venv) [mythcat@desk my_project]$ pyre
 ƛ No watchman binary found. 
To enable pyre incremental, you can install watchman: https://facebook.github.io/watchman/docs/install
 ƛ Defaulting to non-incremental check.
 ƛ Found 1 type error!
test.py:1:0 Incompatible variable type [9]: i is declared to have type `int` but is used as type `str`.
(venv) [mythcat@desk my_project]$ cat test.py 
i: int = 'string'

You can see is working well and detect the problem.
A short intro can found on the Facebook developers youtube channel: