def cn_digit(s):
if isinstance(s, (int, float)):
s = str(s)
elif not isinstance(s, str):
return s
s = s.replace(',', '')
m = re.match(r'(-?)(\d+)((?:\.\d+)?)', s, re.A)
if not m:
return s
intpart = m.group(2)
dem = "万亿兆京垓秭穰沟涧正载极"
result = intpart[-4:]
for i in range(-4,-len(intpart),-4):
result = intpart[i-4:i] + dem[-i//4-1] + result
return m.group(1) + result + m.group(3)