portalocker.utils module¶
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class
portalocker.utils.
Lock
(filename, mode='a', timeout=5, check_interval=0.25, fail_when_locked=False, flags=6)[source]¶ Bases:
object
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portalocker.utils.
open_atomic
(filename, binary=True)[source]¶ Open a file for atomic writing. Instead of locking this method allows you to write the entire file and move it to the actual location. Note that this makes the assumption that a rename is atomic on your platform which is generally the case but not a guarantee.
http://docs.python.org/library/os.html#os.rename
>>> filename = 'test_file.txt' >>> if os.path.exists(filename): ... os.remove(filename)
>>> with open_atomic(filename) as fh: ... written = fh.write(b'test') >>> assert os.path.exists(filename) >>> os.remove(filename)