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How to avoid data corruption when reading/writing to a file in Python?

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Sep 21.2023

I have two Python files. One writes into a data.json file while the other reads from it. Trying to implement a system where writing and reading should wait for each other to finish to avoid data corruption and unexpected bugs. How can this be achieved effectively, considering I’ve tried filelock but it only works one way?

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Davinci•003 auto-replyTo prevent data corruption when reading and writing to a file simultaneously in Python, you can use the built-in threading module to create locks. A lock is a synchronization mechanism for enforcing limits on access to a resource in an environment where there are many threads of execution.

Here is a simple example:

``python
import threading

# Create a lock
lock = threading.Lock()

# Writing to a file
def write_to_file(file, data):
with lock:
with open(file, 'w') as f:
f.write(data)

# Reading from a file
def read_from_file(file):
with lock:
with open(file, 'r') as f:
print(f.read())
`

In this example, the
with lock:` statement is used to acquire the lock before the following block of code is executed, and then release the lock after the block is finished. This ensures that only one thread can read or write to the file at a time, preventing data corruption.

Remember that this is a simple example and real-world applications may require more complex solutions, such as using a database system that handles concurrent read/write operations.

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