An implemenation of Unix's tee utility for use in Python programs. This makes it really easy to write to a single object, but have the those changes replicated into multiple writes to various files (or file-like objects).
import pytee
tee = pytee.create_tee([ '/tmp/tee-test-1', '/tmp/tee-test-2' ], mode='a')
print >>tee, "a" * 100000,
tee.close()
# Need to wait for the child process to finish writing to the file(s)
# before we can measure the amount of data written to the file(s).
os.wait()
for filename in files:
with open(filename, 'r') as fh:
chars = len(fh.read())
print "File '%s' has %d chars" % (filename, chars)
The purpose of create_tee() is to allow the unix 'tee' utility to be easily emulated within Python. If spawns a child process that listens for data on a pipe, and wraps the write end of that pipe in a file object. This allows it to be used seamlessly where ever file ojects are used, even in places likes subprocess.Popen() where a fileno is required.
-
Create a Tee object that implements all of the file-like object trappings. (Keep around the
create_tee()function for seamless compatibility). -
Possibly create a 'comm channel' to communicate commands to the child process (add/remove files from the list).
Brandon Sandrowicz brandon@sandrowicz.org
BSD 3-clause license. See LICENSE file for terms.