python - Number format with commas and one decimal -

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this question has answer here:

i have number 1 decimal point such 123456.1 format 123,456.1

tried use locale format number unable work

instead used following:

def format(n):     r = []     i, c in enumerate(reversed(str(n))):         if , (not (i % 3)):             r.insert(0, ',')         r.insert(0, c)     return ''.join(r)

which results in 1,234,56.1

use string formatting.

>>> '{:,}'.format(123456.1) '123,456.1'

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