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Tkinter Python中的按钮命令问题

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1 回答
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提问于 2025-04-16 22:35

我有一个程序，它会在SEC的Edgar数据库中搜索年度报告（10-K），并在一个列表框中返回40个不同的项目。现在我想创建一个“下一组40”按钮，来显示列表框中的下40个项目，下面的代码就实现了这个功能：

def Next():

global entryWidget

page = 'http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=' + entryWidget.get().strip() + '&filenum=&State=&Country=&SIC=&owner=exclude&Find=Find+Companies&action=getcompany'
sock = urllib.urlopen(page)
raw = sock.read()
soup = BeautifulSoup(raw)

npar = str(soup.find(value="Next 40"))
index = npar.find('/cgi')
index2 = npar.find('count=40') + len('count=40')
nextpage = 'http://www.sec.gov' + npar[index:index2]

sock2 = urllib.urlopen(nextpage)
raw2 = sock2.read()
soup2 = BeautifulSoup(raw2)

psoup = str(soup2.findAll(nowrap=True))

myparser = MyParser()
myparser.parse(psoup)

filinglist = myparser.get_descriptions()
linklist = myparser.get_hyperlinks()

filinglist = [s for s in filinglist if s != 'Documents']
filinglist = [s for s in filinglist if s != 'Documents Interactive Data']
filinglist = [s for s in filinglist if not re.match(r'\d{3}-', s)]

linklist = [s for s in linklist if not s.startswith('/cgi-')]

Lb1.delete(0, END)

counter = 0

while counter < len(filinglist):
    Lb1.insert(counter, filinglist[counter])
    counter = counter +1

你可以看到，当按钮被按下时，它会读取原始链接（页面），然后在网页的HTML中查找“下一组40”的超链接。接着，它会解析新的HTML文档（nextpage），然后获取项目名称和相关链接。现在这段代码成功地从原始页面跳转到了下一页，但它只能显示下一页的内容。

那么，我该如何把（nextpage）变成原始的（page），然后每次按下“下一组”按钮时都能列出（nextnextpage）HTML文档中的项目呢？抱歉，如果这样说让你感到困惑，我也不知道怎么更好地解释。

为了更清楚，这里是我想解析的实际网站链接：http://www.sec.gov/cgi-bin/browse-edgar ... getcompany 我希望“下一组”按钮能够不断从该网站的“下一组40”按钮中获取HTML超链接。

这是我的整个程序代码，以防你需要：

import BeautifulSoup
from BeautifulSoup import BeautifulSoup
import urllib
import sgmllib
from Tkinter import *
import tkMessageBox
import re

class MyParser(sgmllib.SGMLParser):

def parse(self, psoup):
    self.feed(psoup)
    self.close()

def __init__(self, verbose=0):
    sgmllib.SGMLParser.__init__(self, verbose)
    self.descriptions = []
    self.hyperlinks = []
    self.inside_td_element = 0
    self.starting_description = 0

def start_td(self, attributes):
    for name, value in attributes:
        if name == "nowrap":
            self.inside_td_element = 1
            self.starting_description = 1

def end_td(self):
    self.inside_td_element = 0

def start_a(self, attributes):
    for name, value in attributes:
        if name == "href":
            self.hyperlinks.append(value)

def handle_data(self, data):
    if self.inside_td_element:
        if self.starting_description:
            self.descriptions.append(data)
            self.starting_description = 0
        else:
            self.descriptions[-1] += data

def get_descriptions(self):
    return self.descriptions

def get_hyperlinks(self):
    return self.hyperlinks

def Submit():

global entryWidget

if entryWidget.get().strip() == "":
    tkMessageBox.showerror("Tkinter Entry Widget", "Enter a text value")
else:
    page = 'http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=' + entryWidget.get().strip() + '&filenum=&State=&Country=&SIC=&owner=exclude&Find=Find+Companies&action=getcompany'
    sock = urllib.urlopen(page)
    raw = sock.read()
    soup = BeautifulSoup(raw)
    psoup = str(soup.findAll(nowrap=True))
    myparser = MyParser()
    myparser.parse(psoup)

    filinglist = myparser.get_descriptions()
    linklist = myparser.get_hyperlinks()

    filinglist = [s for s in filinglist if s != 'Documents']
    filinglist = [s for s in filinglist if s != 'Documents Interactive Data']
    filinglist = [s for s in filinglist if not re.match(r'\d{3}-', s)]

    linklist = [s for s in linklist if not s.startswith('/cgi-')]

    counter = 0

    while counter < len(filinglist):
        Lb1.insert(counter, filinglist[counter])
        counter = counter +1

    downloadbutton.configure(state=NORMAL)
    nextbutton.configure(state=NORMAL)

def Next():

global entryWidget

page = 'http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=' + entryWidget.get().strip() + '&filenum=&State=&Country=&SIC=&owner=exclude&Find=Find+Companies&action=getcompany'
sock = urllib.urlopen(page)
raw = sock.read()
soup = BeautifulSoup(raw)

npar = str(soup.find(value="Next 40"))
index = npar.find('/cgi')
index2 = npar.find('count=40') + len('count=40')
nextpage = 'http://www.sec.gov' + npar[index:index2]

sock2 = urllib.urlopen(nextpage)
raw2 = sock2.read()
soup2 = BeautifulSoup(raw2)

psoup = str(soup2.findAll(nowrap=True))

myparser = MyParser()
myparser.parse(psoup)

filinglist = myparser.get_descriptions()
linklist = myparser.get_hyperlinks()

filinglist = [s for s in filinglist if s != 'Documents']
filinglist = [s for s in filinglist if s != 'Documents Interactive Data']
filinglist = [s for s in filinglist if not re.match(r'\d{3}-', s)]

linklist = [s for s in linklist if not s.startswith('/cgi-')]

Lb1.delete(0, END)

counter = 0

while counter < len(filinglist):
    Lb1.insert(counter, filinglist[counter])
    counter = counter +1

previousbutton.configure(state=NORMAL)
nextbutton.configure(state=DISABLED)

def Previous():

global entryWidget

page = 'http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=' + entryWidget.get().strip() + '&filenum=&State=&Country=&SIC=&owner=exclude&Find=Find+Companies&action=getcompany'
sock = urllib.urlopen(page)
raw = sock.read()
soup = BeautifulSoup(raw)

psoup = str(soup.findAll(nowrap=True))

myparser = MyParser()
myparser.parse(psoup)

filinglist = myparser.get_descriptions()
linklist = myparser.get_hyperlinks()

filinglist = [s for s in filinglist if s != 'Documents']
filinglist = [s for s in filinglist if s != 'Documents Interactive Data']
filinglist = [s for s in filinglist if not re.match(r'\d{3}-', s)]

linklist = [s for s in linklist if not s.startswith('/cgi-')]

Lb1.delete(0, END)

counter = 0

while counter < len(filinglist):
    Lb1.insert(counter, filinglist[counter])
    counter = counter +1

nextbutton.configure(state=NORMAL)
previousbutton.configure(state=DISABLED)

if __name__ == "__main__":

root = Tk()
root.title("SEC Edgar Search")
root["padx"] = 10
root["pady"] = 25

top = Frame(root)
bottom = Frame(root)
bottom2 = Frame(root)
top.pack(side=TOP)
bottom.pack(side=BOTTOM, fill=BOTH, expand=True)
bottom2.pack(side=BOTTOM, fill=BOTH, expand=True)

textFrame = Frame(root)

entryLabel = Label(textFrame)
entryLabel["text"] = "Ticker symbol:"
entryLabel.pack(side=TOP)

entryWidget = Entry(textFrame)
entryWidget["width"] = 15
entryWidget.pack(side=LEFT)

textFrame.pack()

scrollbar = Scrollbar(root)
scrollbar.pack(side=RIGHT, fill=Y)

Lb1 =  Listbox(root, width=20, height=15, yscrollcommand=scrollbar.set, selectmode=EXTENDED)
Lb1.pack()

scrollbar.config(command=Lb1.yview)

submitbutton = Button(root, text="Submit", command=Submit)
submitbutton.pack(in_=bottom2, side=TOP)

downloadbutton = Button(root, text="Download")
downloadbutton.pack(in_=bottom2, side=TOP)
downloadbutton.configure(state=DISABLED)

previousbutton = Button(root, text="Previous 40", command=Previous)
previousbutton.pack(in_=bottom, side=LEFT)
previousbutton.configure(state=DISABLED)

nextbutton = Button(root, text="Next 40", command=Next)
nextbutton.pack(in_=bottom, side=LEFT)
nextbutton.configure(state=DISABLED)

root.mainloop()
tkinter gui web scraping html parsing listbox pagination sec edgar button command

1 个回答

1

使用一个应用程序类来代替全局变量。现在你总是下载第一页。但是你的应用程序类应该缓存当前页面的内容，也就是“汤”，这样 next 就可以从“下一页40个”按钮中获取点击值：

class Application(Frame):
    def __init__(self, parent=None):
        Frame.__init__(self, parent)
        self.pack()

        self.top = Frame(self)
        self.bottom = Frame(self)
        self.bottom2 = Frame(self)
        self.top.pack(side=TOP)
        self.bottom.pack(side=BOTTOM, fill=BOTH, expand=True)
        self.bottom2.pack(side=BOTTOM, fill=BOTH, expand=True)
        #... 
        self.submitbutton = Button(self, text="Submit", command=self.submit)
        self.submitbutton.pack(in_=self.bottom2, side=TOP)
        #...

    #...

    def submit(self):
        page = ('http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=' + 
                 self.entryWidget.get().strip() + 
                '&filenum=&State=&Country=&SIC=&owner=exclude' 
                '&Find=Find+Companies&action=getcompany')
        #...
        self.soup = ...

    def next(self):
        #...
        #there must be a better way than this to extract the onclick value
        #but I don't use/know BeautifulSoup to help with this part

        npar = str(self.soup.find(value="Next 40"))
        index1 = npar.find('/cgi')
        index2 = npar.find('count=40') + len('count=40')  
        page = 'http://www.sec.gov' + npar[index1:index2]

        sock = urllib.urlopen(page)
        raw = sock.read()
        self.soup = BeautifulSoup(raw)

        #...

if __name__ == '__main__':
    root = Tk()
    root.title("SEC Edgar Search")
    root["padx"] = 10
    root["pady"] = 25

    app = Application(root)

    app.mainloop()
    root.destroy()

对于每一新页面，点击链接会更新 &Start 参数。所以你也可以在你的类中增加一个计数器，而不需要去解析当前的内容来获取这个值。

回答于 2025-04-16 由 Python大师
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