(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..................Content has been hidden....................
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