在 Python 中使用正则表达式查找数字并将数字字附加到字符串答案

【问题标题】：Find Digit and Append Number Word to String Using Regex in Python在 Python 中使用正则表达式查找数字并将数字字附加到字符串
【发布时间】：2019-02-18 20:17:20
【问题描述】：

我正在尝试查找输入字符串中的任何数字，然后在字符串末尾附加每个数字的英文单词。但是，我的代码抛出错误can't assign to function call。

import re

def to_eng(s):

    words = {"0":"zero","1":"one","2":"two","3":"three","4":"four","5":"five","6":"six","7":"seven","8":"eight","9":"nine"}
    k = re.findall(r"[0-9]",s)
    for i in k:
        w = words.items(), key=lambda x: x[0]
    print(s + w)

s = "I want to buy 17 cars."
to_eng(s)

我希望我的输出是：I want to buy 17 cars. one seven

【问题讨论】：

标签： python regex dictionary for-loop

【解决方案1】：

我会这样做：

import re
s = "I want to buy 17 cars."
words = {"0":"zero","1":"one","2":"two","3":"three","4":"four","5":"five","6":"six","7":"seven","8":"eight","9":"nine"}
k = re.findall(r"[0-9]",s)
w = ' '.join([words[i] for i in k])
print(w) #one seven

此解决方案使用所谓的list 理解，这允许比使用for 循环更简洁的代码。

【讨论】：

【解决方案2】：

提示：这里缺少一些东西（可能是函数调用？）

for i in k:
    w = words.items(), key=lambda x: x[0]
    #  ^                                 ^
print(s + w)

但您可以将其更改为：

def to_eng(s):
    words = {"0":"zero","1":"one","2":"two","3":"three","4":"four","5":"five","6":"six","7":"seven","8":"eight","9":"nine"}
    rx = re.compile(r'\d')
    for m in rx.finditer(s):
        s = s + " " + words[m.group(0)]
    print(s)

产量

I want to buy 17 cars. one seven

或者 - 甚至更好 - 完全使用列表：

def to_eng(s):
    words = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"]
    rx = re.compile(r'\d')

    return s + " ".join(words[int(m.group(0))] for m in rx.finditer(s))

至于你的最后一个问题 - 用英文单词插入括号 - 你需要弥补一个替换功能：

def to_eng(s):
    words = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"]
    rx = re.compile(r'\d+')

    def repl(digits):
        return digits.group(0) + " (" + " ".join(words[int(x)] for x in digits.group(0)) + ")"

    return rx.sub(repl, s)

这会产生您的示例字符串：

I want to buy 17 (one seven) cars.

【讨论】：

@whiteyflowr：查看底部的更新答案（如果对您有帮助，请接受答案）。