Python 数字转中文大写金额：财务报销发票必备

Python 把 1234567.89 这种阿拉伯数字金额转成壹佰贰拾叁万肆仟伍佰陆拾柒元捌角玖分，支持小数两位、零的处理，附完整代码。

场景痛点

写报销单、开发票、做合同时，金额既要写阿拉伯数字也要写中文大写，比如 ¥1234567.89 要写成"壹佰贰拾叁万肆仟伍佰陆拾柒元捌角玖分"。手动写容易错，零的处理特别麻烦，比如 1001 是壹仟零壹元，不是壹仟零零壹。用 Python 写个转换函数，传数字直接出中文大写，财务报销、合同模板里都能用。

用到的库

# 纯 Python 实现，不需要第三方库

完整代码

# 数字位和单位的对应表
DIGITS = "零壹贰叁肆伍陆柒捌玖"
UNITS_INT = ["", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟"]
UNITS_DEC = ["角", "分"]


def four_to_chinese(num):
"""把 0-9999 的整数转成中文，最多四位"""
s = str(num).zfill(4)
result = ""
zero_flag = False  # 记录是否需要补一个零
for i, ch in enumerate(s):
d = int(ch)
unit = UNITS_INT[3 - i]
if d == 0:
zero_flag = True
else:
if zero_flag:
result += "零"
zero_flag = False
result += DIGITS[d] + unit
return result


def integer_to_chinese(integer):
"""把整数部分按亿、万、节分组转中文"""
if integer == 0:
return ""
s = str(integer)
# 从右往左每四位一组
groups = []
while s:
groups.append(s[-4:])
s = s[:-4]
# groups[0] 是个级，groups[1] 万级，groups[2] 亿级
suffixes = ["", "万", "亿", "万亿"]
result = ""
for i, g in enumerate(groups):
chunk = four_to_chinese(int(g))
if chunk:
result = chunk + suffixes[i] + result
return result


def money_to_chinese(amount):
"""把金额转成人民币中文大写"""
amount = round(float(amount) + 1e-9, 2)
integer = int(amount)
decimal = round((amount - integer) * 100)
jiao = decimal // 10
fen = decimal % 10

if integer == 0 and decimal == 0:
return "零元整"

parts = ""
if integer > 0:
parts += integer_to_chinese(integer) + "元"

if jiao == 0 and fen == 0:
parts += "整"
else:
if jiao > 0:
parts += DIGITS[jiao] + "角"
elif integer > 0:
parts += "零"
if fen > 0:
parts += DIGITS[fen] + "分"
return parts


def main():
tests = [0, 0.5, 0.05, 100, 1001, 10000, 1234567.89, 100000000, 20030405.67]
for n in tests:
print(f"{n:>15} -> {money_to_chinese(n)}")


if __name__ == "__main__":
main()