Python open() 在 w+ 模式下不创建文件

Question

I'm creating an application that looks into a website's text and then checks if the input string is in the url of the website's url. The way I'm doing is:

1. Replace the spaces (' ') in the given string (because url's can't have spaces, duh)
2. use requests to get the text of the website url
3. Create a new file and write every string you find in the website in the file.
4. Read the file line by line and if one line has the string in it, open it in a webbrowser.

I hope I explained it well. Here is my code:

def getGame():
    game = gameEntry.get()
    gameClean = game.replace(' ', '_')
    print(gameClean)
    gameCheck1 = requests.get('INSERT LINK HERE')
    game2 = gameCheck1.text
    with open('Links.txt', 'w+') as f:
        f.write(game2)
        readLinks = f.readlines()
        for link in readLinks:
            if game in link:
                print(f'Found working link: {link}')

Thanks in advance.

Answer 1

When you write to the file, the file pointer ends up at the end of the file; a subsequent read begins at the end of the file and finds nothing. To fix, call f.seek(0) after the write call to move the file pointer back to the beginning of the file.

Also, just as a side-note, there's no reason to call .readlines() ; just delete the readlines line entirely and change the loop to:

for link in f:

and you'll read the lines on demand (instead of creating a whole list of them up front when you only need a line at a time).