导入类，然后将参数传递给函数

Question

I have a python file:

# -*- coding: utf-8 -*-

from bead import Ford

szotar = {"The" : "A", "sun": "nap", "shining" : "süt", "wind" : "szél", "not" : "nem", "blowing" : "fúj"}

fd = Ford(szotar)
fd.fordit("teszt.txt")

I have to write the Ford class, which has a fordit function, which opens the file passed as the argument. I wrote this:

class Ford(dict):
    def fordit(read):
        fajl = open(read)
        for sor in fajl:
            print(sor)
        fajl.close()

But I get the error "TypeError: fordit() takes exactly 1 argument (2 given)". What is the problem?

Answer 1

You didn't define fordit with the necessary arguments. f.fordit(x) is equivalent to Ford.fordit(f, x) , so you need to define it to take two arguments, the first being the object calling the method and conventionally (but not necessarily) named self .

(Unrelated, but you should use a with statement, which ensures that the file is closed even if an error occurs while it is open. The file is closed implicitly once the with statement completes.)

class Ford(dict):
    def fordit(self, read):
        with open(read) as fajl:
            for sor in fajl:
                print(sor)