将数字转换为人民币大写

def num2chn(num):
"""
将数字（数字字符串）转换为人民币大写
:param num: int、float或者str
:return: 返回处理结果，发生错误返回None
"""
chr = ('零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖')
bit = ('分', '角', '元', '拾', '佰', '仟', '万', '拾', '佰', '仟', '亿', '拾', '佰', '仟', '万')
# 例 324562.003
# 转换为 00265423
try:
num = float(num)
# 将数字反序排列，从右至左依次
num_str = ('%0.2f' % num).replace('.', '')[::-1]
except ValueError:
return None
n = len(num_str)
if n >= 15:
return None
result = []
for i in range(0, n):
# 非圆、万、亿，
if num_str[i] == "0" and i != 2 and i != 6 and i != 10:
s = chr[0]
elif num_str[i] == "0" and (i == 2 or i == 6 or i == 10):
s = bit[i]
else:
s = bit[i] + chr[int(num_str[i])]
result.append(s)
# 从左值右重排字符串
rst = "".join(result)[::-1]
# 去零，中间多个零合并为一个，尾部零全去， "零" == chr[0]
# r = r"[零]+"
r = "[" + chr[0] + "]+"
rst = re.compile(r).sub(chr[0], rst).rstrip(chr[0])
# 去零元、零万、零亿
for i in [2, 6, 10]:
rst = rst.replace(chr[0]+bit[i], bit[i])
if rst[-1] == bit[2]:
rst += "整"
print('%0.2f' % num)
print(rst)
return rst