print problem

[pirata]

I was trying to print a dot on console every second to indicates
running process, so I wrote, for example:

for i in xrange(10):
print ".",
time.sleep(1)

Idealy, a dot will be printed out each second. But there is nothing
print out until after 10 seconds, all 10 dots come out together.

I've tried lose the comma in the print statement, and it works.

Is that because of the print statement buffer the characters until
there is a new line character?

Thanks

[Gabriel Genellina]

Re: print problem

En Tue, 17 Jun 2008 03:15:11 -0300, pirata <pirata@mars.in validescribió:

I was trying to print a dot on console every second to indicates
running process, so I wrote, for example:
>
for i in xrange(10):
print ".",
time.sleep(1)
>
Idealy, a dot will be printed out each second. But there is nothing
print out until after 10 seconds, all 10 dots come out together.
>
I've tried lose the comma in the print statement, and it works.
>
Is that because of the print statement buffer the characters until
there is a new line character?

Very probably, altough I can't reproduce it on Windows. Try invoking the script with python -u (unbuffered input/output):

python -u your_script.py

--
Gabriel Genellina

[Rich Healey]

Re: print problem

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Hash: SHA1

Gabriel Genellina wrote:

En Tue, 17 Jun 2008 03:15:11 -0300, pirata <pirata@mars.in validescribió:
>

>I was trying to print a dot on console every second to indicates
>running process, so I wrote, for example:
>>
>for i in xrange(10):
> print ".",
> time.sleep(1)
>>
>Idealy, a dot will be printed out each second. But there is nothing
>print out until after 10 seconds, all 10 dots come out together.
>>
>I've tried lose the comma in the print statement, and it works.
>>
>Is that because of the print statement buffer the characters until
>there is a new line character?

>
Very probably, altough I can't reproduce it on Windows. Try invoking the script with python -u (unbuffered input/output):
>
python -u your_script.py
>

Or just write to sys.stdout without the print wrapper..

- --
Rich Healey - healey.rich@gma il.com
Developer / Systems Admin - OpenPGP: 0x8C8147807
MSN: bitchohealey@ho tmail.com AIM: richohealey33
irc.psych0tik.n et -#hbh #admins richohealey
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[Gabriel Genellina]

Re: print problem

En Tue, 17 Jun 2008 04:10:41 -0300, Rich Healey <healey.rich@gm ail.comescribió :

Gabriel Genellina wrote:

>En Tue, 17 Jun 2008 03:15:11 -0300, pirata <pirata@mars.in validescribió:
>>

>>I was trying to print a dot on console every second to indicates
>>running process, so I wrote, for example:
>>>
>>for i in xrange(10):
>> print ".",
>> time.sleep(1)
>>>
>>Idealy, a dot will be printed out each second. But there is nothing
>>print out until after 10 seconds, all 10 dots come out together.
>>>
>>I've tried lose the comma in the print statement, and it works.
>>>
>>Is that because of the print statement buffer the characters until
>>there is a new line character?

>>
>Very probably, altough I can't reproduce it on Windows. Try invoking the script with python -u (unbuffered input/output):
>>
>python -u your_script.py
>>

Or just write to sys.stdout without the print wrapper..

I think the output is still buffered, even if you write directly to sys.stdout, but I don't have a Linux box to test right now.

--
Gabriel Genellina

[Gabriel Genellina]

Re: print problem

En Tue, 17 Jun 2008 04:10:41 -0300, Rich Healey <healey.rich@gm ail.comescribió :

Gabriel Genellina wrote:

>En Tue, 17 Jun 2008 03:15:11 -0300, pirata <pirata@mars.in validescribió:
>>

>>I was trying to print a dot on console every second to indicates
>>running process, so I wrote, for example:
>>>
>>for i in xrange(10):
>> print ".",
>> time.sleep(1)
>>>
>>Idealy, a dot will be printed out each second. But there is nothing
>>print out until after 10 seconds, all 10 dots come out together.
>>>
>>I've tried lose the comma in the print statement, and it works.
>>>
>>Is that because of the print statement buffer the characters until
>>there is a new line character?

>>
>Very probably, altough I can't reproduce it on Windows. Try invoking the script with python -u (unbuffered input/output):
>>
>python -u your_script.py
>>

Or just write to sys.stdout without the print wrapper..

I think the output is still buffered, even if you write directly to sys.stdout, but I don't have a Linux box to test right now.

--
Gabriel Genellina

[Chris]

Re: print problem

On Jun 17, 8:15 am, pirata <pir...@mars.in validwrote:

I was trying to print a dot on console every second to indicates
running process, so I wrote, for example:
>
for i in xrange(10):
    print ".",
    time.sleep(1)
>
Idealy, a dot will be printed out each second. But there is nothing
print out until after 10 seconds, all 10 dots come out together.
>
I've tried lose the comma in the print statement, and it works.
>
Is that because of the print statement buffer the characters until
there is a new line character?
>
Thanks

import sys
for i in xrange(10):
sys.stdout.writ e('.')
sys.stdout.flus h()

[Peter Pearson]

Re: print problem

On Tue, 17 Jun 2008 04:46:38 -0300, Gabriel Genellina wrote:

En Tue, 17 Jun 2008 04:10:41 -0300, Rich Healey escribió:

>Gabriel Genellina wrote:

>>En Tue, 17 Jun 2008 03:15:11 -0300, pirata <pirata@mars.in validescribió:
>>>
>>>I was trying to print a dot on console every second to indicates
>>>running process, so I wrote, for example:
>>>>
>>>for i in xrange(10):
>>> print ".",
>>> time.sleep(1)
>>>>
>>>Idealy, a dot will be printed out each second. But there is nothing
>>>print out until after 10 seconds, all 10 dots come out together.
>>>>
>>>I've tried lose the comma in the print statement, and it works.
>>>>
>>>Is that because of the print statement buffer the characters until
>>>there is a new line character?

[snip]

>Or just write to sys.stdout without the print wrapper..

>
I think the output is still buffered, even if you write
directly to sys.stdout, but I don't have a Linux box to
test right now.

Here (Python 2.4.3), dots written to sys.stdout are saved up and
appear all at once.

However, you can flush the buffer yourself by invoking sys.stdout.flus h()
immediately after either the "print" or the "sys.stdout.wri te".

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