Message 309774 - Python tracker

I completed my change. It now fixes locale.localeconv(), str.format() for int, float, complex and decimal.Decimal:

vstinner@apu$ ./python lc_numeric.py 
LC_CTYPE: ('fr_FR', 'ISO8859-1')
LC_NUMERIC: ('es_MX', 'UTF-8')
decimal_point: '.'
thousands_sep: '\u2009'
grouping: [3, 3, 0]
int.__format__: '1\u2009234'
float.__format__: '1\u2009234'
complex.__format__: '1\u2009234+0j'
Decimal.__format__: '1\u2009234'