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4 | 4 | [](https://pypi.org/project/filelock/)
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6 | 6 | [](https://filelock.readthedocs.io/en/latest/?badge=latest) |
| 7 | +status](https://readthedocs.org/projects/py-filelock/badge/?version=latest&style=flat-square)](https://py-filelock.readthedocs.io/en/latest/?badge=latest) |
8 | 8 | [](https://github.com/psf/black)
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10 | 10 | [](https://pepy.tech/project/filelock/month)
|
11 | 11 | [](https://github.com/tox-dev/py-filelock/actions/workflows/check.yml)
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12 | 12 |
|
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| -This package contains a single module, which implements a platform independent file lock in Python, which provides a |
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| -simple way of inter-process communication: |
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| - |
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| -```Python |
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| -from filelock import Timeout, FileLock |
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| - |
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| -lock = FileLock("high_ground.txt.lock") |
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| -with lock: |
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| - open("high_ground.txt", "a").write("You were the chosen one.") |
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| -``` |
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| - |
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| -**Don't use** a _FileLock_ to lock the file you want to write to, instead create a separate _.lock_ file as shown above. |
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| - |
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| - |
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| - |
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| -## Similar libraries |
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| - |
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| -Perhaps you are looking for something like: |
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| - |
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| -- the [pid](https://pypi.python.org/pypi/pid) 3rd party library, |
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| -- for Windows the [msvcrt](https://docs.python.org/3/library/msvcrt.html#msvcrt.locking) module in the standar library, |
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| -- for UNIX the [fcntl](https://docs.python.org/3/library/fcntl.html#fcntl.flock) module in the standard library. |
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| - |
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| -## Installation |
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| - |
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| -_py-filelock_ is available via PyPi: |
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| - |
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| -```bash |
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| -python -m pip install filelock |
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| -``` |
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| - |
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| -## Documentation |
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| - |
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| -The documentation for the API is available on [readthedocs.org](https://filelock.readthedocs.io/). |
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| - |
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| -### Examples |
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| - |
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| -A _FileLock_ is used to indicate another process of your application that a resource or working directory is currently |
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| -used. To do so, create a _FileLock_ first: |
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| - |
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| -```python |
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| -from filelock import Timeout, FileLock |
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| - |
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| -file_path = "high_ground.txt" |
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| -lock_path = "high_ground.txt.lock" |
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| - |
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| -lock = FileLock(lock_path, timeout=1) |
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| -``` |
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| - |
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| -The lock object supports multiple ways for acquiring the lock, including the ones used to acquire standard Python thread |
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| -locks: |
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| - |
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| -```python |
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| -with lock: |
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| - open(file_path, "a").write("Hello there!") |
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| - |
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| -lock.acquire() |
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| -try: |
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| - open(file_path, "a").write("General Kenobi!") |
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| -finally: |
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| - lock.release() |
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| -``` |
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| - |
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| -The _acquire()_ method accepts also a _timeout_ parameter. If the lock cannot be acquired within _timeout_ seconds, a |
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| -_Timeout_ exception is raised: |
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| - |
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| -```python |
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| -try: |
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| - with lock.acquire(timeout=10): |
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| - open(file_path, "a").write("I have a bad feeling about this.") |
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| -except Timeout: |
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| - print("Another instance of this application currently holds the lock.") |
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| -``` |
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| - |
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| -The lock objects are recursive locks, which means that once acquired, they will not block on successive lock requests: |
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| - |
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| -```python |
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| -def cite1(): |
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| - with lock: |
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| - open(file_path, "a").write("I hate it when he does that.") |
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| - |
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| -def cite2(): |
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| - with lock: |
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| - open(file_path, "a").write("You don't want to sell me death sticks.") |
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| - |
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| -# The lock is acquired here. |
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| -with lock: |
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| - cite1() |
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| - cite2() |
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| - |
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| -# And released here. |
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| -``` |
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| - |
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| -All log messages by this library are made using the _DEBUG_ level, under the `filelock` name. On how to control |
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| -displaying/hiding that please consult the |
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| -[logging documentation of the standard library](https://docs.python.org/3/howto/logging.html). |
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| - |
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| -E.g. to hide these messages you can use `logging.getLogger("filelock").setLevel(logging.INFO)`. |
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| - |
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| -## FileLock vs SoftFileLock |
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| - |
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| -The _FileLock_ is platform dependent while the _SoftFileLock_ is not. Use the _FileLock_ if all instances of your |
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| -application are running on the same host and a _SoftFileLock_ otherwise. |
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| - |
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| -The _SoftFileLock_ only watches the existence of the lock file. This makes it ultra portable, but also more prone to |
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| -dead locks if the application crashes. You can simply delete the lock file in such cases. |
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| - |
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| -## Contributions |
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| - |
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| -Contributions are always welcome, please make sure they pass all tests before creating a pull request. Never hesitate to |
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| -open a new issue, although it may take some time for me to respond. |
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| - |
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| -## License |
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| - |
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| -This package is [public domain](./LICENSE). |
| 13 | +For more information checkout the [official documentation](https://py-filelock.readthedocs.io/en/latest/api.html). |
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