print to screen and file with one print statement

[Mike Müller]

I would like to send my print statements to the terminal and to a log
file at the same time. I can use redirect as describe in Dive into
Python:

import sys

print 'Dive in'
saveout = sys.stdout
fsock = open('out.log', 'w')
sys.stdout = fsock
print 'This message will be logged but not displayed'
print 'This message should be logged and also displayed'
sys.stdout = saveout
fsock.close()

This redirects all output from Python to the open file.
At the same time I'd like to see all printed text on screen.
How can I do this?

Thanks

Mike

[Two Inches]

How about this:

class writer :
def __init__(self, *writers) :
self.writers = writers

def write(self, text) :
for w in self.writers :
w.write(text)

import sys

saved = sys.stdout
fout = file('out.log', 'w')
sys.stdout = writer(sys.stdout, fout)
print "There you go."
sys.stdout = saved
fout.close()

[Mark McEahern]

[Mike Müller]

> This redirects all output from Python to the open file.
> At the same time I'd like to see all printed text on screen.
> How can I do this?

Same basic idea:

#!/usr/bin/env python

import sys

class MyWriter:

def __init__(self, stdout, filename):
self.stdout = stdout
self.logfile = file(filename, 'a')

def write(self, text):
self.stdout.write(text)
self.logfile.write(text)

def close(self):
self.stdout.close()
self.logfile.close()

writer = MyWriter(sys.stdout, 'log.txt')
sys.stdout = writer

print 'test'

Cheers,

// m

-

[Mike Müller]

"Mark McEahern" <mark...@mceahern.com> wrote in message news:<mailman.1045085143...@python.org>...

> Same basic idea:
>
> #!/usr/bin/env python
>
> import sys
>
> class MyWriter:
>
> def __init__(self, stdout, filename):
> self.stdout = stdout
> self.logfile = file(filename, 'a')
>
> def write(self, text):
> self.stdout.write(text)
> self.logfile.write(text)
>
> def close(self):
> self.stdout.close()
> self.logfile.close()
>
> writer = MyWriter(sys.stdout, 'log.txt')
> sys.stdout = writer
>
> print 'test'
>

Hi Mark,

works perfect. Just had to change ´file´ to ´open´ for my Python 2.1.
Adding the method ´flush(self)´ to Writer helped to get my
´sys.stdout.flush()´ to work.

Thanks also to two inches (previous post).

Mike

[amiw...@gmail.com]

Hay Mike,

Can you tell me how & where you added the 'flush(self)' & 'sys.stdout.flush()'?


Thanks!
Ami

[KS]

Hi Mike/Ami,

Can you please let me know where do I add flush(self) and get sys.stdout.flush() to work?

Thanks,
KS

[Chris Angelico]

On Thu, Aug 28, 2014 at 8:23 AM, KS <sen.ku...@gmail.com> wrote:
> Can you please let me know where do I add flush(self) and get sys.stdout.flush() to work?

Check the dates. You're responding to a 2013 response to a 2003 post.
If you have a question about something this old, it's probably best to
start a new thread.

Also, please avoid Google Groups, unless you're prepared to fix its
problems... like the horribly obvious one here that you haven't quoted
even an iota from the original text.

ChrisA