在函数中传递元组

Question

I went through questions but I couldn't figure it out in case of mine

I wrote a function which takes a tuple as a parameter and performs this:

def add_subject(name_stud, *data):
    c.execute("INSERT INTO " + name_stud + " VALUES (?,?,?,?,?,?,?,?)", 
             data)
    conn.commit()

And I tried calling this function in a class method passing tuple as a parameter but I get error

add_subject(self.page1.student_name, data)

data is the tuple there.

and the error is:

sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 8, and there are 1 supplied.

And I tried unpacking at the time I am using it, I still got error:

def add_subject(name_stud, data):
    c.execute("INSERT INTO " + name_stud + " VALUES (?,?,?,?,?,?,?,?)", 
              *data)
    conn.commit()

error:

sqlite3.InterfaceError: Error binding parameter 0 - probably unsupported type.

Answers from other peoples didn't help me. Any help will be appreciated.

Answer 1

You've declared the parameter data as positional args, but are passing only a single argument, data . This means that the final parameter will be (data,) . You need to unpack the tuple on passing in order to populate the positional args.

add_subject(self.page1.student_name, *data)

Answer 2

Since you're passing the tuple as a single argument, you shouldn't write *data in the function definition. Just declare it as an ordinary function parameter.

def add_subject(name_stud, data):
    row = data
    c.execute("INSERT INTO " + name_stud + " VALUES (?,?,?,?,?,?,?,?)", 
             data)
    conn.commit()