How to stop print printing spaces?
crobc at BOGUS.sbcglobal.net
Sun Jul 29 04:56:13 CEST 2007
Roel Schroeven wrote:
> CC schreef:
>> ln = '\x00\x01\xFF 456789abcdef'
>> # This works:
>> import sys
>> for i in range(0,15):
>> sys.stdout.write( '%.2X' % ord(ln[i]) )
>> Is that the best way, to work directly on the stdout stream?
> It's not a bad idea: print is mostly designed to be used in interactive
> mode and for quick and dirty logging; not really for normal program
> output (though I often use it for that purpose).
> There is another way: construct the full output string before printing
> it. You can do that efficiently using a list comprehension and the
> string method join():
> >>> print ''.join(['%.2X' % ord(c) for c in ln])
Oh yeah, that's right!
> In Python 2.4 and higher, you can use a generator expression instead of
> a list comprehension:
> >>> print ''.join('%.2X' % ord(c) for c in ln)
Hmm. I'm at 2.3 :-(
> BTW, in your examples it's more pythonic not to use range with an index
> variable in the for-loop; you can loop directly over the contents of ln
> like this:
> import sys
> for c in ln:
> sys.stdout.write('%.2X' % ord(c))
Ah yes, duh! I played with this means of iterating over items in a
sequence the other day while studying the tutorial, but it sinks in
slowly for a C programmer.
That's why I posted my silly code. I'll probably do that a lot until I
get used to this pythonic business.
Thanks for the input!
Christopher R. Carlen
crobc at bogus-remove-me.sbcglobal.net
SuSE 9.1 Linux 2.6.5
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