This function converts 0 and positive integers (or their string representations) to their ordinal values. For example, it would convert 0 to "0th", 1 to "1st", 2 to "2nd", 3 to "3rd" and so on.
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #!/usr/bin/env python
def ordinal(value):
"""
Converts zero or a *postive* integer (or their string
representations) to an ordinal value.
>>> for i in range(1,13):
... ordinal(i)
...
u'1st'
u'2nd'
u'3rd'
u'4th'
u'5th'
u'6th'
u'7th'
u'8th'
u'9th'
u'10th'
u'11th'
u'12th'
>>> for i in (100, '111', '112',1011):
... ordinal(i)
...
u'100th'
u'111th'
u'112th'
u'1011th'
"""
try:
value = int(value)
except ValueError:
return value
if value % 100//10 != 1:
if value % 10 == 1:
ordval = u"%d%s" % (value, "st")
elif value % 10 == 2:
ordval = u"%d%s" % (value, "nd")
elif value % 10 == 3:
ordval = u"%d%s" % (value, "rd")
else:
ordval = u"%d%s" % (value, "th")
else:
ordval = u"%d%s" % (value, "th")
return ordval
if __name__ == '__main__':
import doctest
doctest.testmod()
|
This is a quick way to get a more reader-friendly ordinal value for zero and positive integers (including their string representations). The recipe was inspired by the similarly named "ordinal" template tag from Django's humanize module.
Code doesn't quite work properly... '11' becomes '11st' '12' becomes '12nd'
Not sure about Python, but in perl I did this...
sub ordinal { my $rawvalue = int(shift); # keep the original so we can return it later my $value = $rawvalue % 100; #only need the last 2 digits for what we're doing my $suffix; if ($value == 11 || $value == 12 || $value == 13) { $suffix = 'th'; } elsif ($value % 10 == 1) { $suffix = 'st'; } elsif ($value % 10 == 2) { $suffix = 'nd'; } elsif ($value % 10 == 3) { $suffix = 'rd'; } else { $suffix = 'th'; } return "$rawvalue$suffix"; }
Which deals correctly with 11,12 etc and also deals with numbers of any length.
Bah, formatting fail.
Hi gist, I don't seem to be getting the same errors as you. The function seems to work fine.
Can you provide any more specifics that might help debug? If it helps, I'm using the function with Python 2.6.2 on Ubuntu 9.04. Regards, Serdar
Grist, There was indeed a mistake in the original code: I accidentally dropped the outer "else" clause when pasting it over to ActiveState (though my local code was correct, which is why the function was working for me). I've updated the recipe and it should work now. I've also noted more emphatically that this only works for positive integers or their string representations.
Apologies to folks who this might have confused/frustrated.
Cheers!