Why does the code snippet throw an error?

Question

Python

The code snippet itself:

def uch(self):
        self.uch = MyUch()
        self.uch.show() 

    def och(self):
        self.och = Myoch()
        self.och.show()       
        
    def opr(self):
        try:
            file = open(self.lineEdit1.text() + '.txt')
        except IOError as e:
            och()
        else:
            uch()

Mistake:

Traceback (most recent call last):
  File "C:\for cheacher\sentense.py", line 82, in opr
    uch()
TypeError: uch() missing 1 required positional argument: 'self'

Answer 1

Wow! Oh. Def...