利用Python把网页内容转换为pdf格式文件，批量下载到本地 ！
初衷： 使用Google浏览器的打印命令时，保存下来的pdf文件中包含网页中的所有内容（左右边框和广告等），想仅把当前网页中的主体内容转成pdf格式的文件保存下来。
操作说明：
填写URL及提取条件（浏览器中按F12，查找），预览，打印。
python代码说明：
默认可不输入提取条件，对于没有下载过的网站，会出现提示；对于已下载过的网站，有保存记录，自动关联当前网站的提取条件。
python代码如下：
import win32api
import win32con
import requests
from bs4 import BeautifulSoup
import webbrowser
import tkinter
from tkinter import filedialog
import pdfkit
# 预览
def take_body():
global url
global body_class
global headers
url = var_url.get()
body_class = var_body.get()
# 请求URL
headers = {
"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
"Accept-Encoding":"gzip, deflate, br",
"User-Agent":"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36"
}
r = requests.get(url,headers = headers)
soup = BeautifulSoup(r.content,"html.parser")
# 提取标题
global title
title = soup.title.text
# 判断该网站是否已下载转换过
f = open("temp.txt","r")
a = f.read()
dict = eval(a)
f.close()
if url.split("/")[2] in dict:
body_class = dict[url.split("/")[2]]
elif body_class == "":
win32api.MessageBox(0, "未从在该网站下载过文档，添加提取条件", "提示", win32con.MB_OK)
# 提取正文
if body_class != "":
body = soup.find_all(class_= body_class)[0]
# 对提取的内容，调用浏览器进行预览
html_test = str(body)
with open("html_test.html","wb")as f:
f.write(html_test.encode("utf-8"))
webbrowser.open("E:PythonHtmlToPdfHtmlToPdf_V0.7html_test.html",new=0,autoraise=True)
# html转pdf
def htmltopdf():
file_name = title + ".pdf"
types = [("pdf文件", "*.pdf")]
dest_dir = filedialog.asksaveasfilename(initialfile = file_name,filetypes = types)
options = {"encoding": "utf-8"}
pdfkit.from_file("html_test.html", dest_dir, options=options)
dict = {}
f = open("temp.txt","r")
a = f.read()
dict = eval(a)
f.close()
dict[url.split("/")[2]] = body_class
f = open("temp.txt","w")
f.write(str(dict))
f.close()
# 创建窗口
root = tkinter.Tk()
root.title("HtmlToPdf")
root.geometry("300x200")
var_url = tkinter.StringVar()
var_body = tkinter.StringVar()
label_1 = tkinter.Label(root,text = "URL：").place(x=10,y=10)
text_1 = tkinter.Entry(root,textvariable = var_url).place(x=100,y=10)
label_2 = tkinter.Label(root,text = "输入提取条件：").place(x=10,y=55)
text_2 = tkinter.Entry(root,show = None,textvariable = var_body).place(x=100,y=55)
button_2 = tkinter.Button(root,text = "预览",command = take_body).place(x=250,y=50)
label_3 = tkinter.Label(root,text = "是否打印：").place(x=10,y=100)
button_3 = tkinter.Button(root,text = "是",command = htmltopdf).place(x=100,y=95)
button_3 = tkinter.Button(root,text = "否",command = root.quit).place(x=130,y=95)
root.mainloop()