Print function and spaces

[Dan Williams]

Hi people

I'm getting a little annoyed with the way the print function always adds a
space character between print statements unless there has been a new line.
The manual mentions that "In some cases it may be functional to write an
empty string to standard output for this reason." Am I the only the who
thinks that this sucks? It's the first thing I've come across in Python that
I really think is a design flaw.

Is there a good way to stop the space being automatically generated, or am I
going to have to write a blank string to standard output, like the manual
mentions?

Cheers

Dan

[Bjoern Paschen]

Re: Print function and spaces

On Thu, 05 Feb 2004 11:38:26 +0000, Dan Williams wrote:
[color=blue]
> Is there a good way to stop the space being automatically generated, or am I
> going to have to write a blank string to standard output, like the manual
> mentions?[/color]
I don't know if these are good ways, but i found this information about
the topic on google:

http://www-106.ibm.com/developerworks/library/l-python101.html?dwzone=ws

"The part about concatenation is important here"

http://www.faqts.com/knowledge_base/view.phtml/aid/4465

"How to turn off the automatic space completely"

and i tried to implement the concatenation part into a small function
(beware as i am new to python too ;)):

---snip----
#/usr/bin/env python

def PrintWithoutSpa ces(*args):
output = ""
for i in args:
output = output + i

print output


if __name__ == "__main__":
PrintWithoutSpa ces("yo", "hello", "gutentag")
---snip----

this prints "yohellogutenta g"

--
_______________ _______________ _______________ _______________ _____
Bjoern Paschen ._--_. Panasonic AVC Networks Germany GmbH
paschen@mavd.de -- Audio Video Technology Centre

[Diez B. Roggisch]

Re: Print function and spaces

> def PrintWithoutSpa ces(*args):[color=blue]
> output = ""
> for i in args:
> output = output + i
>
> print output
>
>
> if __name__ == "__main__":
> PrintWithoutSpa ces("yo", "hello", "gutentag")
> ---snip----
>
> this prints "yohellogutenta g"[/color]

You function won't work on mixed-type args:

PrintWithoutSpa ces("a", 10)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 4, in PrintWithoutSpa ces
TypeError: cannot concatenate 'str' and 'int' objects


A better way would be this:

def myprint(*args):
print "".join([str(x) for x in args])

[Rich Krauter]

Re: Print function and spaces

> Is there a good way to stop the space being automatically[color=blue]
> generated, or am I
> going to have to write a blank string to standard output, like the >[/color]
manual mentions?

You can try the write() method of file-like objects:

import sys
sys.stdout.writ e('%s test\n'%'This is a')

print is a convenience, not necessarily a fine-grained formatting tool
from what I understand.

Rich

On Thu, 2004-02-05 at 08:17, Diez B. Roggisch wrote:[color=blue][color=green]
> > def PrintWithoutSpa ces(*args):
> > output = ""
> > for i in args:
> > output = output + i
> >
> > print output
> >
> >
> > if __name__ == "__main__":
> > PrintWithoutSpa ces("yo", "hello", "gutentag")
> > ---snip----
> >
> > this prints "yohellogutenta g"[/color]
>
> You function won't work on mixed-type args:
>
> PrintWithoutSpa ces("a", 10)
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "<stdin>", line 4, in PrintWithoutSpa ces
> TypeError: cannot concatenate 'str' and 'int' objects
>
>
> A better way would be this:
>
> def myprint(*args):
> print "".join([str(x) for x in args])
>[/color]

[wes weston]

Re: Print function and spaces



Dan Williams wrote:[color=blue]
> Hi people
>
> I'm getting a little annoyed with the way the print function always adds a
> space character between print statements unless there has been a new line.
> The manual mentions that "In some cases it may be functional to write an
> empty string to standard output for this reason." Am I the only the who
> thinks that this sucks? It's the first thing I've come across in Python that
> I really think is a design flaw.
>
> Is there a good way to stop the space being automatically generated, or am I
> going to have to write a blank string to standard output, like the manual
> mentions?
>
> Cheers
>
> Dan
>
>
>
>[/color]
Dan,
'Does seem a little odd. There's often a good reason
for python "oddities". Usually, it's a matter of practicality.
Maybe it was thought that most intended uses of print are
better of with a space.
[color=blue][color=green][color=darkred]
>>> a="a"
>>> b="b"
>>> print "%s%s" % (a,b)[/color][/color][/color]
ab[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

[Miki Tebeka]

Re: Print function and spaces

Hello Dan,
[color=blue]
> Is there a good way to stop the space being automatically generated, or am I
> going to have to write a blank string to standard output, like the manual
> mentions?[/color]
I use the % formatting and find it much better.

HTH.
Miki

[Bjoern Paschen]

Re: Print function and spaces

On Thu, 05 Feb 2004 14:17:05 +0100, Diez B. Roggisch wrote:
[color=blue]
> You function won't work on mixed-type args:
> A better way would be this:
>
> def myprint(*args):
> print "".join([str(x) for x in args])[/color]
Thanks. Works like a charm :)


--
_______________ _______________ _______________ _______________ _____
Bjoern Paschen ._--_. Panasonic AVC Networks Germany GmbH
paschen@mavd.de -- Audio Video Technology Centre

[Mel Wilson]

Re: Print function and spaces

In article <bvtfop$vs5l8$1 @ID-111250.news.uni-berlin.de>,
"Diez B. Roggisch" <nospam-deets@web.de> wrote:[color=blue][color=green]
>> def PrintWithoutSpa ces(*args):
>> output = ""
>> for i in args:
>> output = output + i
>>
>> print output[/color][/color]
[ ... ][color=blue]
>You function won't work on mixed-type args:
>
>PrintWithoutSp aces("a", 10)
>Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "<stdin>", line 4, in PrintWithoutSpa ces
>TypeError: cannot concatenate 'str' and 'int' objects
>
>
>A better way would be this:
>
>def myprint(*args):
> print "".join([str(x) for x in args])[/color]

True. Or just `output = output + str(i)` .
The `str(i)` is the vital part.

If the output string gets big, it will become plain that
`"".join`... shown above is faster.

Regards. Mel.

[Paul Miller]

using Numarray in a &quot;standalon e&quot; situation

Hey folks - got an interesting problem here.

I have an embedded Python interpreter and I'm packing the app,
python23.dll, and a subset of the Python 23 Lib directory for the utility
modules I need to use (so far, only os and random). I also need to use
numarray and I've copied the numarray directory into my standalone Lib
directory.

Within my code, I have set sys.path to point to my standalone Lib
directory, so in theory it shouldn't be looking in C:/Python23 for any
modules, but when I try to import numarray I see it still sees C:/Python23.

What other stuff do I need to do to make my integrated interpreter and
scripts I load to only see my standalone Lib directory as the Python library?

I hope this makes sense!

[Paul Rubin]

Re: Print function and spaces

"Dan Williams" <dan@ithium.net > writes:[color=blue]
> I'm getting a little annoyed with the way the print function always adds a
> space character between print statements unless there has been a new line.[/color]

Print is a statement, not a function.
[color=blue]
> The manual mentions that "In some cases it may be functional to write an
> empty string to standard output for this reason." Am I the only the who
> thinks that this sucks? It's the first thing I've come across in Python that
> I really think is a design flaw.[/color]

It's sort of a legacy thing, I believe. I don't like it either. It goes
against the Python principle that explicit is better than implicit. If
I want a space in the output, I'd rather ask for one.