Requests Module Missingschema Error In Tkinter Gui Due To Inability To Fill Variable Before Execution Of Mainloop: How To Resolve This?

I'm trying to build a GUI over some existing code and I'm running into a MissingSchema error. I am aware of the general problem but not the best solution. Basically, before the tki

Solution 1:

You are attempting to get url even before the user has tried to enter any. So place url request in a function and call it when the Entry widget has text or bind the event handler to a button

Here is a demo.(you can either press the enter key or the run button after inserting text in the Entry widget)

from tkinter import *
import requests
from tkinter import scrolledtext as st
import re
from bs4 import BeautifulSoup

# searches HTML page title for SEO stop words from stopwords.txt, then provides number and list of present stop wordsdefseo_find_stopwords(urlSoup):
    stopwords_count = 0
    stopwords_list = []
    print('No')
    if urlSoup.title:
        withopen('stopwords.txt', 'r', encoding='utf-8') as file:
            
            for line in file:
                if re.search(r'\b' + line.rstrip('\n') + r'\b', urlSoup.title.text.casefold()):
                    stopwords_count += 1
                    stopwords_list.append(line.rstrip('\n'))

        if stopwords_count > 0:
            log_text.insert(INSERT, "{0} stop words were found in your page title. If possible, it would be good to ""reduce them. The stop words found are: {1}".format(stopwords_count, stopwords_list))


defrequest_url(event=None):
    global urlSoup
    try:
        # 'agent' added as part of effort to avoid HTTP Error 403: Forbidden
        url_request = requests.get(url_entry.get(), headers={'User-Agent': agent})
        url_request.raise_for_status()
        urlSoup = BeautifulSoup(url_request.text, 'lxml')
    except requests.exceptions.MissingSchema as exc:
        log_text.insert(INSERT, "ERROR: Invalid URL provided. Please try again with a valid URL.")
        raise exc    


root = Tk()

urlSoup =''

url_entry = Entry(root)
url_entry.bind('<Return>', request_url)
#url = url_entry.get()

log_text = st.ScrolledText(root, state='disabled')

start_button = Button(root, text='Run program', command=lambda: request_url() or [seo_find_stopwords(urlSoup)])

url_entry.grid(column=0, row=1)
log_text.grid(column=2, row=0, rowspan=3)
start_button.grid(column=1, row=5)

agent = "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:10.0) Gecko/20100101 Firefox/10.0"# attempts to access provided URL, returns errors if unable


root.mainloop()