![]() In this example we will create 1,000 threads each of which will generate 1,000 random numbers between 0 and 1 and write them as a line of text to the same file. We can develop an example that demonstrates that appending to a file from many threads is not thread safe and results in data loss. Is writing to a file thread-safe? If not, how can we make appending a file from multiple threads thread-safe?ĭownload my threading API cheat sheet and as a bonus you will get FREE access to my 7-day email course.ĭiscover how to use the Python threading module including how to create and start new threads and how to use a mutex locks and semaphoresīefore we look at how to make writing to a file thread-safe, let’s look at how it is not thread-safe. In concurrent programming, we may need to write to a file from multiple threads. Threading in Python: The Complete Guide. ![]() You can learn more about Python threads in the guide: ![]() Python provides the ability to create and manage new threads via the threading module and the threading.Thread class. Sometimes we may need to create additional threads in our program in order to execute code concurrently. Both processes and threads are created and managed by the underlying operating system. Need to Append File From Multiple ThreadsĪ thread is a thread of execution in a computer program.Įvery Python program has at least one thread of execution called the main thread. Example of Safe Dedicated File Writing Thread.Need to Append File From Multiple Threads.
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