I need to lock a file for writing in Python. It will be accessed from multiple Python processes at once. I have found some solutions online, but most fail for my purposes as
You may find pylocker very useful. It can be used to lock a file or for locking mechanisms in general and can be accessed from multiple Python processes at once.
If you simply want to lock a file here's how it works:
import uuid
from pylocker import Locker
# create a unique lock pass. This can be any string.
lpass = str(uuid.uuid1())
# create locker instance.
FL = Locker(filePath='myfile.txt', lockPass=lpass, mode='w')
# aquire the lock
with FL as r:
# get the result
acquired, code, fd = r
# check if aquired.
if fd is not None:
print fd
fd.write("I have succesfuly aquired the lock !")
# no need to release anything or to close the file descriptor,
# with statement takes care of that. let's print fd and verify that.
print fd