[Tutor] class Writer

[Christopher Spears]

I've been working my way through an online tutorial
and came across the following sample script:

import sys

class Writer:
    def __init__(self, filename):
        self.filename = filename
    def write(self, msg):
        f = file(self.filename, 'a')
        f.write(msg)
        f.close()

sys.stdout = Writer('tmp.log')
print 'Log message #1'
print 'Log message #2'
print 'Log message #3'

The script created the tmp.log file with the following
lines:
Log message #1
Log message #2
Log message #3

I understand that the class is taking the strings from
stdout (supplied by the print statements) and writing
them to a text file.  Does the user need to explicitly
call the write function?  For example:

sys.stdout = Writer('tmp.log').write(whatever the
message is)