使用 RE 将条件值从键插入字典

Question

所以我的问题很简单，我的条件是：

if "__" in key, insert 'class=\"\" ' into opening tag in value pair: <tag></tag> 所以它变成： <tag class=""></tag> 然后插入 [=13 的相关值=]
否则 <tag></tag> 保持原样

我已经完成了其中的 95%，但还漏了一步。这是我的命令和代码：

d1 = {
  "h1": "<h1 class=\"my-heading\">[]</h1>",
  "h1__display-3": "<h1 class=\" \">[]</h1>",
  "h1__display-3_text-white_text-center": "<h1 class=\" \">[]</h1>",
  "h1__mt-4": "<h1 class=\"\">[]</h1>",
  "h1__mt-5": "<h1 class=\" \">[]</h1>",
  "h1__mt-5_kakabum": "<h1 class=\" \">[]</h1>",
  "h1__my-4": "<h1 class=\" \">[]</h1>",
  "h2": "<h2>[]</h2>",
  "h2__card-title": "<h2 class=\"\">[]</h2>",
  "h2__mt-4": "<h2 class=\"\">[]</h2>",
  "h2__my-4": "<h2 class=\"\">[]</h2>"
}

d2 = {k:k for k, v in d1.items()}
res = {}
for k in d2:
    key = k.split('__')[0]
    if key in d1:
        res[k] = d1[key]
        res2 = {k: re.sub(r'class="([\w\- ]+)"', r'class=" ' + d2[k] + '"', v) for k,v in res.items()}
        res3 = {k: re.sub(r'\w\w\__', r'', v).replace('_', ' ') for k, v in res2.items()}

print('Res', json.dumps(res3, indent= 2))

在上面之后我得到不需要的：

 {
  "h1": "<h1 class=\"my-heading h1\">[]</h1>", # notice the unnecessary 'h1' in class
  "h1__display-3": "<h1 class=\"my-heading display-3\">[]</h1>",
  "h1__display-3_text-white_text-center": "<h1 class=\"my-heading display-3 text-white text-center\">[]</h1>",
  "h1__mt-4": "<h1 class=\"my-heading mt-4\">[]</h1>",
  "h1__mt-5": "<h1 class=\"my-heading mt-5\">[]</h1>",
  "h1__mt-5_kakabum": "<h1 class=\"my-heading mt-5 kakabum\">[]</h1>",
  "h1__my-4": "<h1 class=\"my-heading my-4\">[]</h1>",
  "h2": "<h2>[]</h2>",
  "h2__card-title": "<h2>[]</h2>",
  "h2__mt-4": "<h2>[]</h2>",
  "h2__my-4": "<h2>[]</h2>"
}

而不是需要：

 {
  "h1": "<h1 class=\"my-heading\">[]</h1>", 
  "h1__display-3": "<h1 class=\"my-heading display-3\">[]</h1>",
  "h1__display-3_text-white_text-center": "<h1 class=\"my-heading display-3 text-white text-center\">[]</h1>",
  "h1__mt-4": "<h1 class=\"my-heading mt-4\">[]</h1>",
  "h1__mt-5": "<h1 class=\"my-heading mt-5\">[]</h1>",
  "h1__mt-5_kakabum": "<h1 class=\"my-heading mt-5 kakabum\">[]</h1>",
  "h1__my-4": "<h1 class=\"my-heading my-4\">[]</h1>",
  "h2": "<h2>[]</h2>", 
  "h2__card-title": "<h2 class=\"card-title\">[]</h2>", 
  "h2__mt-4": "<h2 class=\"mt-4\">[]</h2>",
  "h2__my-4": "<h2 class=\"my-4\">[]</h2>"
}

^注意："h2": "<h2>[]</h2>", 的 d1 没有 class 属性但因为键有 '__'，class 模式已被插入 "h2__card-title": "<h2 class=\"card-title\">[]</h2>".

我错过了 res2 和 res3 之间的步骤，有人可以帮我吗？

Answer 1

好的，我通过详细阅读 python 正则表达式文档解决了这个问题，这是我的弱点： https://docs.python.org/3.3/howto/regex.html

解决方案如下（使用与 OP 相同的字典）：

d2 = {k:k for k, v in d1.items()}
mydict = {}
for k in d2:
    key = k.split('__')[0]
    if key in d1:
        mydict[k] = d1[key]
        # @params: re.sub(pattern, repl, string, max=0)
        class_regex = r'class="([\w\- ]+)"'
        underscore_regex = '\w+(__{1,2})'
        arrow_regex = '\w+(>+)'

        res2 = {k: re.sub(class_regex, r'class=" ' + (k if re.search(re.compile(underscore_regex), k) else '') + '"', v) for k,v in mydict.items()}
        res3 = {k: (v if re.search(re.compile(underscore_regex), v) else (v if re.search(re.compile(class_regex), v) else re.sub(r'(>)', r' class="' + (k if re.search(re.compile(underscore_regex), k) else re.sub(class_regex, r'', '')) + '">', v, 1))) for k, v in res2.items()}
        res4 = {k: re.sub(r'__', r' ', v).replace('_', ' ') for k, v in res3.items()}
        res5 = {k: re.sub(r' class=\"\"', r'', v) for k, v in res4.items()}

print(json.dumps(res5, indent= 2, sort_keys=True))

这导致正确的输出：

 {
  "h1": "<h1 class=\"my-heading\">[]</h1>", 
  "h1__display-3": "<h1 class=\"my-heading display-3\">[]</h1>",
  "h1__display-3_text-white_text-center": "<h1 class=\"my-heading display-3 text-white text-center\">[]</h1>",
  "h1__mt-4": "<h1 class=\"my-heading mt-4\">[]</h1>",
  "h1__mt-5": "<h1 class=\"my-heading mt-5\">[]</h1>",
  "h1__mt-5_kakabum": "<h1 class=\"my-heading mt-5 kakabum\">[]</h1>",
  "h1__my-4": "<h1 class=\"my-heading my-4\">[]</h1>",
  "h2": "<h2>[]</h2>", 
  "h2__card-title": "<h2 class=\"card-title\">[]</h2>", 
  "h2__mt-4": "<h2 class=\"mt-4\">[]</h2>",
  "h2__my-4": "<h2 class=\"my-4\">[]</h2>"
}

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