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Flask:request.form[“xxxxx”]、request.form.get(“xxxxxx”)和request.args.get(“xxxxx”)之间的区别?

flask.request.form["xxx"]flask.request.form.get("xxx")和之间有什么区别flask.request.args.get("xxx")

我有这个问题,因为我正在使用flask-login 来处理身份验证。
特别是在下面的代码中(取自flask-login github页面),我不明白为什么 with req.form.get("email"), email 是None,而 with req.form["email"], email 没有值。这是代码。

@login_manager.request_loader
def request_loader(req):
    email = req.form.get('email')
    if email not in users:
        return

    user = User()
    user.id = email

    # DO NOT ever store passwords in plaintext and always compare password
    # hashes using constant-time comparison!
    user.is_authenticated = req.form['pw'] == users[email]['pw']

    return user
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python flask flask-login

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