[](https://pepy.tech/project/cantok)
[](https://pepy.tech/project/cantok)
[](https://codecov.io/gh/pomponchik/cantok)
[](https://github.com/boyter/scc/)
[](https://hitsofcode.com/github/pomponchik/cantok/view?branch=main)
[](https://github.com/pomponchik/cantok/actions/workflows/tests_and_coverage.yml)
[](https://pypi.python.org/pypi/cantok)
[](https://badge.fury.io/py/cantok)
[](http://mypy-lang.org/)
[](https://github.com/astral-sh/ruff)
Cancellation Token is a pattern that allows us to refuse to continue calculations that we no longer need. It is implemented out of the box in many programming languages, for example in [C#](https://learn.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken) and in [Go](https://pkg.go.dev/context). However, there was still no sane implementation in Python, until the [cantok](https://github.com/pomponchik/cantok) library appeared.
## Quick start
Install [it](https://pypi.org/project/cantok/):
```bash
pip install cantok
```
And use:
```python
from random import randint
from cantok import ConditionToken, CounterToken, TimeoutToken
token = ConditionToken(lambda: randint(1, 100_000) == 1984) + CounterToken(400_000, direct=False) + TimeoutToken(1)
counter = 0
while token:
counter += 1
print(counter)
```
Read more in the [documentation](https://cantok.readthedocs.io/en/latest/)!
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