在 Tkinter 和 Python3 中使用 entry、StringVar 和 IntVar

Question

我是 python 的新手，在解释内容时请使其对初学者友好 :)。基本上，当我尝试运行使用 tkinter 的 reddit 爬虫时，我得到了各种我不理解的错误，在此先感谢，我真的很感谢社区。

下面是一些基本代码：

def Exas():
    import praw
    imgcount = 0
    reddit = praw.Reddit(client_id='CENSORED',
                         client_secret='CENSORED',
                         user_agent='TheBigScraper(By u/scrappermaster)',
                         username='scrappermaster',
                         password='thescrapperisscrap')

    listoftitles = []
    listofurls = []

    # whichone = input('what subreddit do you want to access? ')
    # endlimit = input('what number of pictures do you want to download? ')
    whichoner = whichone
    ender = int(endlimit.get())

    subreddit = reddit.subreddit(whichone)
    for submission in subreddit.hot(limit=int(ender)):
        title = submission.title
        link = submission.url
        Both = title + " " + link
        if '.jpg' in link :
            listofurls.append(link)
            listoftitles.append(title)

再往下大约 50 行：

import tkinter as tk
import colorama

root = tk.Tk()


root.title("InstagramBot")

root.geometry('320x125')

whichone = str(tk.StringVar())
endlimit = tk.StringVar()

lblWhichone = tk.Label(root, text = 'Subreddit Name:').grid(row = 0, column = 0, padx = 0, pady = 10)
entWhichone = tk.Entry(root, textvariable = whichone).grid(row = 0, column = 1)

lblIntendlimit = tk.Label(root, text = 'Number of Pictures:').grid(row = 1, column = 0, padx = 0, pady = 10)
entendlimit = tk.Entry(root, textvariable = endlimit).grid(row = 1, column = 1)


btn = tk.Button(root, text = 'Execute', command = Exas, fg='red', font='Helvetica 18 bold').grid(row = 5, column = 1)
root.mainloop()

root.title("InstagramBot")

奇怪的错误代码：

Exception in Tkinter callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File "/Users/eucar/Documents/Testing/Compactor2000.py", line 28, in Exas
    for submission in subreddit.hot(limit=int(ender)):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/praw/models/listing/generator.py", line 52, in __next__
    self._next_batch()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/praw/models/listing/generator.py", line 62, in _next_batch
    self._listing = self._reddit.get(self.url, params=self.params)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/praw/reddit.py", line 408, in get
    data = self.request('GET', path, params=params)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/praw/reddit.py", line 534, in request
    params=params)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/prawcore/sessions.py", line 185, in request
    params=params, url=url)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/prawcore/sessions.py", line 130, in _request_with_retries
    raise self.STATUS_EXCEPTIONS[response.status_code](response)
prawcore.exceptions.Redirect: Redirect to /subreddits/search

Answer 1

我已将 Exas 减少到基于 Tkinter 的最小值。我从未使用过 praw 库，也没有安装它。

def Exas():
    whichoner = whichone.get()
    ender = int(endlimit.get())
    print(whichoner, ender)

为我在评论中提到的 StingVar 修改你的 tkinter window。

import tkinter as tk 

root = tk.Tk()
root.title("InstagramBot")

root.geometry('320x125+50+50')

whichone = tk.StringVar()
endlimit = tk.StringVar()

lblWhichone = tk.Label(root, text = 'Subreddit Name:').grid(row = 0, column = 0, padx = 0, pady = 10)
entWhichone = tk.Entry(root, textvariable = whichone).grid(row = 0, column = 1)
# The grid method returns None!  All these variables have the value None.  
# I don't think it matters for what you're doing but may cause problems for you in the future. 
# In general this is better.
# entWhichone = tk.Entry(root, textvariable = whichone)
# entWhichone.grid(row = 0, column = 1)
# entWhichone now points to a tk.Entry object.

lblIntendlimit = tk.Label(root, text = 'Number of Pictures:').grid(row = 1, column = 0, padx = 0, pady = 10)
entendlimit = tk.Entry(root, textvariable = endlimit).grid(row = 1, column = 1)

btn = tk.Button(root, text = 'Execute', command = Exas, fg='red', font='Helvetica 18 bold').grid(row = 5, column = 1)
root.mainloop()

如果我在您的 window 中键入 test 和 42，它会将 Test 和 42 回显到我的控制台。您最新的错误消息表明 StringVar 已传递给 praw 函数或方法。在 Exas 函数中你需要：

whichoner = whichone.get() # Was it left at ... = whichone ?

如果上述建议没有帮助，请尝试在调用任何其他内容之前打印 whichoner 和 ender 以检查它们 return 您的期望。

一个风格点是在Python中函数和变量通常是小写的，用下划线'_'分隔，lbl_which_one而不是lblWhichone，exas代表Exas。类以大写字母命名 tk.Entry 创建一个 class 条目的对象。您的代码仍然有效，只是其他人更难理解。

在 Tkinter 和 Python3 中使用 entry、StringVar 和 IntVar

Using entry, StringVar and IntVar with Tkinter and Python3

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