Implement C's Switch in Python 3

[Avi Gross]

Yes, you caught the usual flaw in the often irregular English language.

The 11th, 12th and 13th do all begin with 1 so there is a simple fix in the
function version by checking if day//10 is 1.

Revised example:

""" Use last digit to determine suffix handling teens well """

def nthSuffix(day):
    if (day // 10 == 1):
        suffix = "th"
    else:
        nth = day % 10
        suffix = "st" if nth == 1 else ("nd" if nth == 2 else ("rd" if nth
== 3 else "th"))

    return str(day) + suffix

>>> [ nthSuffix(day) for day in range(1,32)]
['1st', '2nd', '3rd', '4th', '5th', '6th', '7th', '8th', '9th', '10th',
'11th', '12th', '13th', '14th', '15th', '16th', '17th', '18th', '19th',
'20th', '21st', '22nd', '23rd', '24th', '25th', '26th', '27th', '28th',
'29th', '30th', '31st']

Want a dictionary version? Use the above to make a full dictionary:

>>> chooseFrom = { day : nthSuffix(day) for day in range(1,32)}
>>> chooseFrom
{1: '1st', 2: '2nd', 3: '3rd', 4: '4th', 5: '5th', 6: '6th', 7: '7th', 8:
'8th', 9: '9th', 10: '10th', 11: '11th', 12: '12th', 13: '13th', 14: '14th',
15: '15th', 16: '16th', 17: '17th', 18: '18th', 19: '19th', 20: '20th', 21:
'21st', 22: '22nd', 23: '23rd', 24: '24th', 25: '25th', 26: '26th', 27:
'27th', 28: '28th', 29: '29th', 30: '30th', 31: '31st'}
>>> chooseFrom[1]
'1st'
>>> chooseFrom[11]
'11th'
>>> chooseFrom[21]
'21st'


-----Original Message-----
From: Python-list <python-list-bounces+avigross=verizon.net at python.org> On
Behalf Of MRAB
Sent: Saturday, February 2, 2019 10:06 PM
To: python-list at python.org
Subject: Re: Implement C's Switch in Python 3

On 2019-02-03 02:51, Avi Gross wrote:
> I may be missing something, but the focus seems to be only on the 
> rightmost digit. You can get that with
> 
I had the same thought, but came across a problem. "11st", "12nd", "13rd"?

[snip]
> 
> Output:
> 
>>>> for day in range(1, 32):
> 	print( nthSuffix(day))
> 	
> 1st
> 2nd
> 3rd
> 4th
> 5th
> 6th
> 7th
> 8th
> 9th
> 10th
> 11st
> 12nd
> 13rd
> 14th
> 15th
> 16th
> 17th
> 18th
> 19th
> 20th
> 21st
> 22nd
> 23rd
> 24th
> 25th
> 26th
> 27th
> 28th
> 29th
> 30th
> 31st
> 
[snip]
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