不知道语言环境
'{:,}'.format(value) # For Python ≥2.7
f'{value:,}' # For Python ≥3.6
区域感知
import locale
locale.setlocale(locale.LC_ALL, '') # Use '' for auto, or force e.g. to 'en_US.UTF-8'
'{:n}'.format(value) # For Python ≥2.7
f'{value:n}' # For Python ≥3.6