Python：object.__new__() 不带参数[重复]

Question

现在我正在开发一个程序，该程序允许人们进行测试，将它们保存到数据库中，然后打印出来。我不断收到错误：

Traceback (most recent call last):
File "C:/Users/Shepard/Desktop/Gradebook.py", line 50, in <module>
qs = QuestionStorage("questions.db")
TypeError: object.__new__() takes no parameters

有人知道吗？我假设它在 QuestionStorage 类的某个地方，但我不太能弄清楚任何事情。这是我第一次使用 SQLite3，我遇到了很多麻烦，如果有人可以帮助我，那就太好了。 :)

import sqlite3
class QuestionStorage(object):
    def _init_(self, path):
        self.connection = sqlite3.connect(path)
        self.cursor = self.connection.cursor()

    def Close(self):
        self.cursor.close()
        self.connection.close()

    def CreateDb(self):
        query = """CREATE TABLE questions
                 (id INTEGER PRIMARY KEY, Question TEXT, Answer1 TEXT, Answer2 TEXT, Answer3 TEXT, Answer4 TEXT, CorrectAnswer TEXT)"""
        self.cursor.exeute(query)
        self.connection.commit()
        #self.cursor.close()

    def AddQuestion(self, Question, Answer1, Answer2, Answer3, Answer4):
        self.cursor.execute("""INSERT INTO questions
                                VALUES (?, ?, ?, ?, ?, ?)""", (None, Question, Answer1, Answer2, Answer3, Answer4, CorrectAnswer))
        self.connection.commit()

    def GetQuestion(self, index = None):
        self.cursor.execute("""SELECT * FROM questions WEHRE id=?""", (index,))
        res = self.cursor.fetchone()
        return res




print ("TestMaker v.1")
print ("To create a multiple choice test, follow the directions.")
testName = input ("Give your test a name.")
testQ = int(input ("How many questions will be on this test? (Numeric value only.)"))

counter = 1
while counter <= testQ:
    Answer = []
    Answer = [1,2,3,4,5,6]
    Question = input ("What is your question?")
    Answer[1] = input ("What is the first answer?")
    Answer[2] = input ("What is the second answer?")
    Answer[3] = input ("What is the third answer?")
    Answer[4] = input ("What is your last answer?")
    correctAnswer = int(input("Which answer is the correct answer? (1, 2, 3, or 4?)"))
    Answer[5] = Answer[correctAnswer]
    print (Answer[1:6])
    counter +=1
    if __name__ == "__main__":
        qs = QuestionStorage("questions.db")
        qs.CreateDb()    
        qs.AddQuestion(Question, Answer[1] , Answer[2], Answer[3], Answer[4], Answer[5])

qs.Close()

Answer 1

__init__ 方法签名是 __init__，而不是 Python 中的 _init_

Answer 2

值得学习如何自己调试。

您的错误消息中没有任何内容表明该问题与 sqlite3 有任何关系。那么，如果取出QuestionStorage 中的所有sqlite3 调用并运行程序会发生什么？

class QuestionStorage(object):
    def _init_(self, path):
        self.connection = None
        self.cursor = None

    def Close(self):
        pass

    def CreateDb(self):
        query = """CREATE TABLE questions
                 (id INTEGER PRIMARY KEY, Question TEXT, Answer1 TEXT, Answer2 TEXT, Answer3 TEXT, Answer4 TEXT, CorrectAnswer TEXT)"""

    def AddQuestion(self, Question, Answer1, Answer2, Answer3, Answer4):
        pass

    def GetQuestion(self, index = None):
        return [""]

你得到完全相同的错误。这证明 sqlite3 不是罪魁祸首，希望能给您提供如何调试它的线索。

您可以看到问题发生在从回溯创建 QuestionStorage 时，而您只在程序中执行了一次……那么如果您从其余代码中取出所有其他内容呢？

class QuestionStorage(object):
    def _init_(self, path):
        pass

qs = QuestionStorage("questions.db")

同样的错误。现在更明显的是问题所在。而且，即使您自己无法弄清楚，您也可以将 5 行精简版发布到 SO。

Answer 3

我相信您需要在 init 前面加上两个下划线，在 init 后面加上两个下划线，而不仅仅是一个。