Python如何根据页码处理PDF文件的内容

pip install PIL
pip install fitz
pip install pymupdf
pip install wxpython
# pip install 库包名 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
# pip install wxpython -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com       

import fitz
import wx
class PDFExtractor(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent, id=wx.ID_ANY, title=u"PDF Extractor", pos=wx.DefaultPosition,
                          size=wx.Size(500, 254), style=wx.DEFAULT_FRAME_STYLE | wx.TAB_TRAVERSAL,
                          name=u"PDF Extractor")
        self.SetSizeHintsSz(wx.DefaultSize, wx.DefaultSize)
        self.SetForegroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_WINDOW))
        self.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_ACTIVECAPTION))
        bSizer2 = wx.BoxSizer(wx.VERTICAL)
        self.m_filePicker2 = wx.FilePickerCtrl(self, wx.ID_ANY, wx.EmptyString, u"Select a file", u"*.*",
                                               wx.DefaultPosition, wx.DefaultSize, wx.FLP_DEFAULT_STYLE)
        self.m_filePicker2.SetFont(wx.Font(9, 74, 90, 92, False, "微软雅黑"))
        self.m_filePicker2.SetForegroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_HIGHLIGHT))
        self.m_filePicker2.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_HIGHLIGHT))
        bSizer2.Add(self.m_filePicker2, 0, wx.ALL | wx.EXPAND, 5)
        self.m_staticText5 = wx.StaticText(self, wx.ID_ANY, u"Start Page：", wx.DefaultPosition, wx.DefaultSize, 0)
        self.m_staticText5.Wrap(-1)
        self.m_staticText5.SetFont(wx.Font(9, 74, 90, 92, True, "微软雅黑"))
        self.m_staticText5.SetForegroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNTEXT))
        bSizer2.Add(self.m_staticText5, 0, wx.ALL, 5)
        self.m_textCtrl1 = wx.TextCtrl(self, wx.ID_ANY, wx.EmptyString, wx.DefaultPosition, wx.DefaultSize, 0)
        bSizer2.Add(self.m_textCtrl1, 0, wx.EXPAND, 5)
        self.m_staticText6 = wx.StaticText(self, wx.ID_ANY, u"End Page：", wx.DefaultPosition, wx.DefaultSize, 0)
        self.m_staticText6.Wrap(-1)
        self.m_staticText6.SetFont(wx.Font(9, 74, 90, 92, True, "微软雅黑"))
        self.m_staticText6.SetForegroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNTEXT))
        bSizer2.Add(self.m_staticText6, 0, wx.ALL, 5)
        self.m_textCtrl2 = wx.TextCtrl(self, wx.ID_ANY, wx.EmptyString, wx.DefaultPosition, wx.DefaultSize, 0)
        bSizer2.Add(self.m_textCtrl2, 0, wx.EXPAND, 5)
        self.m_button18 = wx.Button(self, wx.ID_ANY, u"Extract", wx.DefaultPosition, wx.DefaultSize, wx.NO_BORDER)
        self.m_button18.SetFont(wx.Font(12, 74, 90, 92, False, "微软雅黑"))
        self.m_button18.SetForegroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNTEXT))
        self.m_button18.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNHIGHLIGHT))
        self.m_button18.Bind(wx.EVT_BUTTON, self.extract_pages)
        bSizer2.Add(self.m_button18, 0, wx.ALIGN_CENTER_HORIZONTAL | wx.SHAPED, 5)
        self.SetSizer(bSizer2)
        self.Layout()
        self.Centre(wx.BOTH)
    def __del__(self):
        pass
    def extract_pages(self, event):
        file_path = self.m_filePicker2.GetPath()
        start_page = int(self.m_textCtrl1.GetValue())
        end_page = int(self.m_textCtrl2.GetValue())
        doc = fitz.open(file_path)
        output_doc = fitz.open()
        for page_num in range(start_page - 1, end_page):
            output_doc.insert_pdf(doc, from_page=page_num, to_page=page_num)
        output_path = file_path.replace(".pdf", "_extracted.pdf")
        output_doc.save(output_path)
        output_doc.close()
        doc.close()
        wx.MessageBox("Extraction complete!", "Success", wx.OK | wx.ICON_INFORMATION)
# app = wx.App()
# PDFExtractor(None, title="PDF Extractor")
# app.MainLoop()
if __name__ == '__main__':
    app = wx.App()  # 运行wx.App()方法。认为窗体是一个独立运行的app，所以要定义一个app的程序类来让窗体执行，调用wx类库对应的App方法来生成应用程序的类对象：wx.App()
    frame = PDFExtractor(None)  # 调用Frame类，并且不指定父类，当前就成为父类
    frame.Show()  # 运行展示界面的方法Show()
    app.MainLoop()  # 进入程序wx.App()循环