CSDN文章保存为MD文档（一）

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import os
import re
import sys
import requests
sys.path.append("")
from os.path import join, exists
from urllib.request import urlretrieve
from bs4 import BeautifulSoup, Tag, NavigableString, Comment

class Parser(object):
    def __init__(self, html,markdown_dir):
        self.html = html
        self.soup = BeautifulSoup(html, 'html.parser')
        self.outputs = []
        self.fig_dir = markdown_dir
        self.pre = False
        self.equ_inline = False

        if not exists(self.fig_dir):
            os.makedirs(self.fig_dir)
        self.recursive(self.soup)

    def remove_comment(self, soup):
        if not hasattr(soup, 'children'): return
        for c in soup.children:
            if isinstance(c, Comment):
                c.extract()
            self.remove_comment(c)

    def recursive(self, soup):
        if isinstance(soup, Comment): return
        elif isinstance(soup, NavigableString):
            for key, val in special_characters.items():
                soup.string = soup.string.replace(key, val)
            self.outputs.append(soup.string)
        elif isinstance(soup, Tag):
            tag = soup.name
            if tag in ['h1', 'h2', 'h3', 'h4', 'h5']:
                n = int(tag[1])
                soup.contents.insert(0, NavigableString('\n' + '#'*n + ' '))
                soup.contents.append(NavigableString('\n'))
            elif tag == 'a' and 'href' in soup.attrs:
                soup.contents.insert(0, NavigableString('['))
                soup.contents.append(NavigableString("]({})".format(soup.attrs['href'])))
            elif tag in ['b', 'strong']:
                soup.contents.insert(0, NavigableString('**'))
                soup.contents.append(NavigableString('**'))
            elif tag in ['em']:
                soup.contents.insert(0, NavigableString('*'))
                soup.contents.append(NavigableString('*'))
            elif tag == 'pre':
                self.pre = True
            elif tag in ['code', 'tt']:
                if self.pre:
                    if not 'class' in soup.attrs:
                        language = 'bash' 
                    else:
                        for name in ['cpp', 'bash', 'python', 'java']:
                            if name in ' '.join(list(soup.attrs['class'])): # <code class="prism language-cpp">
                                language = name
                    soup.contents.insert(0, NavigableString('\n```{}\n'.format(language)))
                    soup.contents.append(NavigableString('```\n'))
                    self.pre = False  # assume the contents of <pre> contain only one <code>
                else:
                    soup.contents.insert(0, NavigableString('`'))
                    soup.contents.append(NavigableString('`'))
            elif tag == 'p':
                if soup.parent.name != 'li':
                    # print(soup.parent)
                    soup.contents.insert(0, NavigableString('\n'))
            elif tag == 'span':
                if 'class' in soup.attrs:
                    if ('katex--inline' in soup.attrs['class'] or
                       'katex--display' in soup.attrs['class']): ## inline math
                        self.equ_inline = True if 'katex--inline' in soup.attrs['class'] else False
                        math_start_sign = '$' if self.equ_inline else '\n\n$$'
                        math_end_sign = '$' if self.equ_inline else '$$\n\n'
                        equation = soup.find_all('annotation', {'encoding': 'application/x-tex'})[0].string
                        equation = math_start_sign + str(equation) + math_end_sign
                        self.outputs.append(equation)
                        self.equ_inline = False
                        return
            elif tag in ['ol', 'ul']:
                soup.contents.insert(0, NavigableString('\n'))
                soup.contents.append(NavigableString('\n'))
            elif tag in ['li']:
                soup.contents.insert(0, NavigableString('+ '))
            elif tag == 'img':
                src = soup.attrs['src']
                # pattern = r'.*\.png'
                pattern = r'(.*\..*\?)|(.*\.(png|jpeg|jpg))'
                result_tuple = re.findall(pattern, src)[0]
                if result_tuple[0]:
                    img_file = result_tuple[0].split('/')[-1].rstrip('?')
                else:
                    img_file = result_tuple[1].split('/')[-1].rstrip('?')
                img_file = join(self.fig_dir, img_file)
                urlretrieve(src, img_file)
                code = ''.format(img_file, img_file)
                self.outputs.append('\n' + code + '\n')
                return
        if not hasattr(soup, 'children'): return
        for child in soup.children:
            self.recursive(child)

def html2md(url, md_file, with_title=False):
    response = requests.get(url,headers = header)
    soup = BeautifulSoup(response.content, 'html.parser', from_encoding="utf-8")
    html = ""
    for child in soup.find_all('svg'):
        child.extract()
    if with_title:
        for c in soup.find_all('div', {'class': 'article-title-box'}):
            html += str(c)
    for c in soup.find_all('div', {'id': 'content_views'}):
        html += str(c)

    parser = Parser(html,markdown_dir)
    with open(md_file, 'w',encoding="utf-8") as f:
        f.write('{}\n'.format(''.join(parser.outputs)))
        
def download_csdn_single_page(article_url, md_dir, with_title=True, pdf_dir='pdf', to_pdf=False):
    response = requests.get(article_url,headers = header)
    soup = BeautifulSoup(response.content, 'html.parser', from_encoding="utf-8")
    title = soup.find_all('h1', {'class': 'title-article'})[0].string  ## 使用 html 的 title 作为 md 文件名
    title = title.replace('*', '').strip().split()
    md_file = md_dir+'/'+title[0] + '.md'
    print('正在保存 Markdown File To {}'.format(md_file))
    html2md(article_url, md_file, with_title=with_title)

header = {
        "Accept": "application/json, text/plain, */*",
        "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8,und;q=0.7",
        "Connection": "keep-alive",
        "Content-Type": "application/json;charset=UTF-8",
        "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) Safari/537.36",
        "x-requested-with": "XMLHttpRequest"
        }

special_characters = {
    "&lt;": "<", "&gt;": ">", "&nbsp": " ",
    "&#8203": "",
}

if __name__ == '__main__':
    article_url = input(str("输入需要保存的csdn博客链接：")) #csdn博客链接
    markdown_dir = './' #保存文件夹
    download_csdn_single_page(article_url,markdown_dir)

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结语

没有人规定，一朵花一定要成长为向日葵或者玫瑰。