使用逗号时处理程序除外的语法无效

Question

我是Python的初学者,并且一直在测试不同类型的示例代码.当我开始使用Python3而不是2.7; 我遇到了语法错误,但我不明白如何修复该错误.

  File "app.py", line 101
    except InvalidUserPass, e:
                          ^
SyntaxError: invalid syntax

这里有更多代码来提供一些上下文:

@app.route('/login/', methods=['GET', 'POST'])
def login():
    error = None
    if request.method == 'POST':
        session['username'] = request.form['username']
        session['password'] = request.form['password']
        try:
            # use reddit_api's login
            r.login(user=session['username'], password=session['password'])
        except InvalidUserPass, e:
            error = 'Incorrect username or password. '
        if not error:
            subreddits = r.user.get_my_reddits(limit=25)
            my_reddits = []
            for i in range(25):
                my_reddits.append(subreddits.next().display_name)
            session['my_reddits'] = my_reddits
            return redirect(url_for('index'))
    return render_template('login.html', error=error)

Answer 1

更改

except InvalidUserPass, e:

至

except InvalidUserPass as e:

有关详细信息,请参阅此

Answer 2

简单except InvalidUserPass as e:.为了天堂的缘故,让我们摆脱丑陋的error事情:

@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        session['username'] = request.form['username']
        session['password'] = request.form['password']

        try:
            # use reddit_api's login
            r.login(user=session['username'], password=session['password'])
        except InvalidUserPass as e:
            return render_template('login.html', 
                                   error='Incorrect username or password.')

        subreddits = r.user.get_my_reddits(limit=25)
        my_reddits = []
        for i in range(25):
            my_reddits.append(subreddits.next().display_name)
        session['my_reddits'] = my_reddits
        return redirect(url_for('index'))

    return render_template('login.html')