常用算法实现（五）——python阿拉伯数字转中文

一.概述（阿拉伯数字转汉语数字）

         在自然语言处理NLP任务中，阿拉伯数字转汉语数字是时常使用到的一个功能，但还是比较少的吧。

         主要思想还是根据千兆、千亿、千万、千等单位三划分，依次按照权位转化。

          github地址:

https://github.com/yongzhuo/Tookit-Sihui/blob/master/tookit_sihui/ml_common/chinese_and_number/chinese_and_number.py

二.实现（常见模板生成句子）

            实现的是: 支持小数，"."和点

# -*- coding: UTF-8 -*-
# !/usr/bin/python
# @time     :2019/5/17 15:17
# @author   :Mo
# @function :change chinese digit to Arab or reversed

import random

# number_to_chinese, 单位-数字
num_dict = { 0: "零", 1: "一", 2: "二", 3: "三", 4: "四",
             5: "五", 6: "六", 7: "七", 8: "八", 9: "九" }
unit_map = [ ["", "十", "百", "千"],       ["万", "十万", "百万", "千万"],
             ["亿", "十亿", "百亿", "千亿"], ["兆", "十兆", "百兆", "千兆"] ]
unit_step = ["万", "亿", "兆"]

class number_to_chinese():
    """
       参考: https://github.com/tyong920/a2c
    """
    def __init__(self):
        self.result = ""

    def number_to_str(self, data):
        assert type(data) == float or int
        res = []
        count = 0
        # 倒转
        str_rev = reversed(str(data))  # seq -- 要转换的序列，可以是 tuple, string, list 或 range。返回一个反转的迭代器。
        for i in str_rev:
            if i is not "0":
                count_cos = count // 4  # 行
                count_col = count % 4   # 列
                res.append(unit_map[count_cos][count_col])
                res.append(num_dict[int(i)])
                count += 1
            else:
                count += 1
                if not res:
                    res.append("零")
                elif res[-1] is not "零":
                    res.append("零")
        # 再次倒序，这次变为正序了
        res.reverse()
        # 去掉"一十零"这样整数的“零”
        if res[-1] is "零" and len(res) is not 1:
            res.pop()

        return "".join(res)

    def decimal_chinese(self, data):
        assert type(data) == float or int
        data_str = str(data)
        if "." not in data_str:
            res = self.number_to_str(data_str)
        else:
            data_str_split = data_str.split(".")
            if len(data_str_split) is 2:
                res_start = self.number_to_str(data_str_split[0])
                res_end = "".join([num_dict[int(number)] for number in data_str_split[1]])
                res = res_start + random.sample(["点", "."], 1)[0] + res_end
            else:
                res = str(data)
        return res


if __name__=="__main__":
    ######  1.测试阿拉伯数字转中文  ######################################################
    ntc = number_to_chinese()
    for i in range(1945, 2100):
        print(ntc.decimal_chinese(i))
    print(ntc.decimal_chinese(0.112354))
    print(ntc.decimal_chinese(1024.112354))

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