In this article, we have learnt how to lock file in python. If you want to unlock a given file in python, you can use the Unlock command in portalocker. If your python program terminates abruptly, this file will continue to remain locked and you will need to unlock it manually. Please note, this solution is not perfect. If you want them to be mandatory then you need to mount the filesystems with mand option. Please note, these locks are of advisory nature in Linux/Unix systems, which is the default setting in these Operating systems. with portalocker.Lock('test.txt', 'rb+', timeout=60) as fh: If you are calling the file lock over a network, then you may need to call os.fsync() before closing the file to actually write all the changes before others can read them. Once it is locked, other processes will not be able to modify it as long as it is locked. We basically call portalocker.Lock() function to lock a file. Once portalocker is installed, you can use it as shown below to lock file test.txt. If you use Python<2, use the following command instead to install portalocker. Here is the command to install Portalocker.

Portalocker provides an easy API for file locking in python. We will use Portalocker for our purposes. There are several libraries available to lock files. You can use these steps on all Python versions, from within your python-based applications, scripts, services and even websites. In this article, we will learn how to lock file in python. But sometimes you may need to execute a file lock from within python. Generally, file locks are implemented using operating system tools in Linux and Windows. This is specially required if multiple processes are accessing the same file. Sometimes you may need to lock a file or directory from your python application or service, to prevent others from modifying it.

How to lock a folder