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

import posixfile
import string

filename = "counter.txt"

 # open for update
 file =, "r+")
 counter = int( + 1
except IOError:
 # create it
 file =, "w")
 counter = 0

file.lock("w|", 6) # rewind
file.write("%06d" % counter)

file.close() # releases lock

Core Modules

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Threads and Processes

Data Representation

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Python Standard Library
Python Standard Library (Nutshell Handbooks) with
ISBN: 0596000960
EAN: 2147483647
Year: 2000
Pages: 252
Authors: Fredrik Lundh © 2008-2020.
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