Question

我是python的新手，在解释事物时，请使其对初学者友好:)。基本上，当我尝试使用tkinter运行reddit爬虫时，会遇到各种我不理解的错误，在此先感谢您，对社区感到非常感谢。

以下是一些基本代码：

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)

大约50行以下：

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降低到基于Tkinter的最低要求。我从来没有使用过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tkinter窗口。

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()

如果我在您的窗口中键入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功能中，您需要：

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

如果上述建议仍无济于事，请尝试在调用其他任何东西之前先打印whichoner和ender，以检查它们是否返回您的期望值。

一个风格要点是，在Python中，函数和变量通常使用小写字母，并带有下划线“ _”，而不是lblWhichone，而将lbl_which_one拆分为Exas。类以大写tk命名。Entry创建一个Entry类的对象。您的代码仍然可以工作，其他人难以理解。

在Tkinter和Python3中使用Entry，StringVar和IntVar

1 个答案: