错误：不是全部字符串格式化期间转换的参数

Question

我有这个注册页，当我提交的表格，我得到这个错误：不是全部字符串格式化期间转换的参数

class RegistrationForm(Form):
email = StringField('Email address')
password = PasswordField('password')
name = StringField('Name')

@app.route('/register/', methods=['GET', 'POST'])
def register():
try:
    form = RegistrationForm(request.form)
    if request.method == 'POST':
        email = form.email.data
        password = sha256_crypt.encrypt((str(form.password.data)))
        con = connection()
        cur=con.cursor()
        x = cur.execute("SELECT * FROM user WHERE username = (%s)",(thwart(email)))
        if int(x) > 0:
            return render_template('register.html',form=form)
        else:
            cur.execute("INSERT INTO user (username,password,name) VALUES (%s,%s,%s);",(thwart(email),thwart(password),thwart(name),))
            con.commit()
            cur.close()
            con.close()
            return redirect(url_for('dashboard'))

    return render_template('register.html', form=form)
except Exception as e:
    return str(e)

Answer 1

x = cur.execute("SELECT * FROM user WHERE username = (%s)",(thwart(email)))

execute的第二个参数应该是元组，您缺少一个,：

cur.execute("SELECT * FROM user WHERE username = (%s)",(thwart(email),))

我想您也不需要()围绕%s，但这取决于表的实际外观。在

进一步澄清：

('str')将计算到字符串'str'，而不是包含它的元组。在

为了创建一个元组，必须包含一个逗号：('str',)。在