X'? (original) (raw)

Eric Smith eric+python-dev at trueblade.com
Thu May 29 15:28:53 CEST 2008

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wesley chun wrote:

hi,

i'm looking to duplicate this string format operator '#' functionality with the new format(). here it is using the old string format operator:

i = 45 'dec: %d/oct: %o/hex: %X' % (i, i, i) # no "#" means no leading "0" or "0x/X" 'dec: 45/oct: 55/hex: 2D' 'dec: %d/oct: %#o/hex: %#X' % (i, i, i) # leading "#" gives us "0" and "0x/X" 'dec: 45/oct: 0o55/hex: 0X2D' if i repeat both of the above with format(), it fails with the "#": 'dec: {0}/oct: {0:o}/hex: {0:X}'.format(i) 'dec: 45/oct: 55/hex: 2D' 'dec: {0}/oct: {0:#o}/hex: {0:#X}'.format(i) Traceback (most recent call last): File "<pyshell#33>", line 1, in 'dec: {0}/oct: {0:#o}/hex: {0:#X}'.format(i) ValueError: Invalid conversion specification i have to resort to the uglier: 'dec: {0}/oct: 0o{0:o}/hex: 0X{0:X}'.format(i) 'dec: 45/oct: 0o55/hex: 0X2D' is this functionality being dropped, or am i missing something? i didn't get anything from searching the Py3000 mailing list archives. i couldn't find anything in either formatter.h nor stringobject.c.

I don't see it as a big problem. You can now use any prefix you want, instead of the hard coded values that # supplied.

secondly, and much more minor, is that i think there's a minor typo in the PEP: print format(10.0, "7.3g") <-- print() is now a function so it needs another pair of ( ).

Fixed in r63786. Thanks for catching it. There was another print() function already in the PEP, so clearly the intent was to be 3.0 compliant.

Eric.

thanks, -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Core Python Programming", Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com

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