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 <module>
'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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