僅顯示一個參數（0給出）

Question

class bmicalculator(): 
    #class created for the bmi calculator GUI and processing the numbers (pain in the ass to make)# 
    def __init__(self,master): 

      self.heightcm=DoubleVar() 
      self.weightkg=DoubleVar() 

      self.master=master 
      self.master.geometry('250x200+100+200') 
      self.master.title('BMI Calculator') 

      self.label2=Label(self.master,text='Welcome to the BMI Calculator',fg='red').grid(row=0,column=0) 
      self.label2=Label(self.master,text='Please enter your height in centimetres',fg='black').grid(row=3,column=0) 
      self.label2=Label(self.master,text='Please enter your weight in kilograms',fg='black').grid(row=4,column=0) 

      self.myheight=Entry(self.master,textvariable=self.heightcm).grid(row=3,column=1) 
      self.myweight=Entry(self.master,textvariable=self.weightkg).grid(row=4,column=1) 
      self.button4=Button(self.master,text="Calculate BMI",fg='red',command=self.bmicalculation).grid(row=7,column=0) 
      self.button5=Button(self.master,text="Exit",fg='red',command=self.exit).grid(row=9,column=0) 

    def bmicalculation(self): 
      bmiheight=self.heightcm.get() 
      print bmiheight 
      bmiweight=self.weightkg.get() 
      bmi= float((bmiweight)/((bmiheight/100)**2)) 
      self.bmi = bmi 
      print bmi 
      self.label1=Label(self.master,text='Your BMI is %.2f' % bmi).grid(row=5,column=0) 

      if bmi <= 18.5: 
       self.label2=Label(self.master,text='This places you in the underweight group.',fg='blue').grid(row=6,column=0) 
       totalindex = 'underweight' 
       self.totalindex = totalindex 
      elif bmi >18.5 and bmi <25: 
       self.label3=Label(self.master,text='This places you in the healthy weight group.',fg='green').grid(row=6,column=0) 
       totalindex = 'healthy' 
       self.totalindex = totalindex 
      elif bmi >= 25 and bmi < 30: 
       self.label4=Label(self.master,text='This places you in the overweight group.',fg='orange').grid(row=6,column=0) 
       totalindex = 'overweight' 
       self.totalindex = totalindex 
      elif bmi >=30: 
       self.label5=Label(self.master,text='This places you in the obese group.',fg='red').grid(row=6,column=0) 
       totalindex = 'obese' 
       self.totalindex = totalindex 

      if bmi >0 and bmi <999999999999999999999: 
       self.button6=Button(self.master,text="Store Data",fg='red',command=self.dynamic_data_entry).grid(row=8,column=0) 

    def dynamic_data_entry(self): 
     #this is what adds the data to the database. Bmi has to be changed to the value of bmi and weightclass has to be change to the weightclass 
      timestamp = str(datetime.datetime.now().date()) 
      bodymassindex = self.bmi 
      weightclass = self.totalindex 
      c.execute("INSERT INTO BMIStorage (timestamp, bodymassindex, weightclass) VALUES (?, ?, ?)",(timestamp, bodymassindex, weightclass)) 
      conn.commit() 
      create_table() 

    def create_table(): 
      c.execute('CREATE TABLE IF NOT EXISTS BMIStorage(timestamp TEXT,bmi REAL,weightclass TEXT)') 

獲取dynamic_data_entry只需一個參數（給出0）的錯誤。我不知道如何解決或出了什麼問題。這是一個帶有GUI的BMI的代碼，我想在其中將用戶的輸入寫入數據庫以及日期。我無法將輸入中的數據寫入數據庫。

**功能是一類 ***更新，提高全班

Answer 1

我想我已經找到你的錯誤的方法。

你是路過，將作爲命令您Button類這樣的功能：

self.button6=Button(...., command=self.dynamic_data_entry).grid(row=8,column=0) 

但是，要傳遞的方法立竿見影，這將導致Error你得到，一旦方法本身需要一個隱含的參數，即self。

這self意味着你的班級的對象。但是，由於您直接通過方法，因此不涉及任何對象。

因此，你應該做這樣的代替：

obj = bmicalculator(master) 
self.button6=Button(...., command=obj.dynamic_data_entry).grid(row=8,column=0) 

這樣一來，你告訴Button類來調用對象的方法，並且在這種情況下，self論證會存在，因爲實例化對象存在。

確保瞭解command=self.dynamic_data_entry和command=obj.dynamic_data_entry