The posixfile Module
(Obsolete, Unix only) The posixfile
module provides a file-like object with
support for file locking, as Example 14-27 shows. New programs should use the
fcntl
module instead.
Example 14-27. Using the posixfile Module
File: posixfile-example-1.py import posixfile import string filename = "counter.txt" try: # open for update file = posixfile.open(filename, "r+") counter = int(file.read(6)) + 1 except IOError: # create it file = posixfile.open(filename, "w") counter = 0 file.lock("w|", 6) file.seek(0) # rewind file.write("%06d" % counter) file.close() # releases lock
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