Re: Controlling output using print with format string
- From: bokr@xxxxxx (Bengt Richter)
- Date: Mon, 31 Oct 2005 01:09:43 GMT
On Sun, 30 Oct 2005 18:44:06 -0600, Paul Watson <pwatson@xxxxxxxxxxxxx> wrote:
>It is clear that just using 'print' with variable names is relatively
>uncontrollable. However, I thought that using a format string would
>reign the problem in and give the desired output.
>
>Must I resort to sys.stdout.write() to control output?
>
Maybe. But I wouldn't say "uncontrollable" -- print is pretty predictable.
>$ python
>Python 2.4.1 (#1, Jul 19 2005, 14:16:43)
>[GCC 4.0.0 20050519 (Red Hat 4.0.0-8)] on linux2
>Type "help", "copyright", "credits" or "license" for more information.
> >>> s = 'now is the time'
> >>> for c in s:
>... print c,
>...
>n o w i s t h e t i m e
> >>> for c in s:
>... print "%c" % (c),
>...
>n o w i s t h e t i m e
> >>> for c in s:
>... print "%1c" % (c),
>...
>n o w i s t h e t i m e
If you like C, you can make something pretty close to printf:
>>> import sys
>>> def printf(fmt, *args):
... s = fmt%args
... sys.stdout.write(s)
... return len(s)
...
>>> s = 'now is the time'
>>> for c in s:
... printf('%s', c)
...
n1
o1
w1
1
i1
s1
1
t1
h1
e1
1
t1
i1
m1
e1
Oops, interactively you probably want to do something other
than implicity print the printf return value ;-)
>>> s = 'now is the time'
>>> for c in s:
... nc = printf('%s', c)
...
now is the time>>>
>>> for c in s:
... nc = printf('%c', c)
...
now is the time>>>
>>> for c in s:
... nc = printf('%1c', c)
...
now is the time>>>
Just to show multiple args, you could pass all the characters
separately, but at once, e.g., (of course you need a format to match)
>>> printf('%s'*len(s)+'\n', *s)
now is the time
16
>>> printf('%s .. %s .. %s .. %s\n', *s.split())
now .. is .. the .. time
25
Or just don't return anything (None by default) from printf if you
just want to use it interactively. Whatever.
Your character-by-character output loop doesn't give much of a clue
to what obstacle you are really encountering ;-)
Regards,
Bengt Richter
.
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