该方法不在类实例内调用

Question

Can't access read_file() method inside an instance class in Python 3.7. I want to print the list list_values_end with functions print_file() . When calling the function . When calling the function print_file () the terminal produces <__ main __. ReadFile object at 0x0082EA70>` instead of the expected list. Please explain what was done wrong? The code is attached.

class ReadFile():
"""Чтение из файла"""
def __init__(self):
    
    self.file_r = 'val_kWt.txt'
    self.read_file(self.file_r)
                    
    self.print_file(self)

def read_file(self, file_r):
    list_values_end = []
    vk = open(file_r, 'r')
    list_values = vk.readlines()

    for list_value in list_values:
        list_values_end.append(list_value.rstrip())
    
    vk.close()
    print(list_values_end)
     
    return list_values_end
    
def print_file(self, list_values_end):
    print(list_values_end)

examp = ReadFile()

Answer 1

You have to place print before return statement. Try this instead:

class ReadFile():
    def __init__(self):
        
        self.file_r = 'val_kWt.txt'
        self.read_file(self.file_r)
        
        self.a = 12
        self.print_a(self.a)
        
    def print_a(self, a):
        print('Printing ', a)

    def read_file(self, file_r):
        list_values_end = []
        vk = open(file_r, 'r')
        list_values = vk.readlines()
 
        for list_value in list_values:
            list_values_end.append(list_value.rstrip())
        
        vk.close()
        print(list_values_end)
        return list_values_end

Edited according to question modification

You passed the object to print_file function. Instead you should have passed the return value of read_file

class ReadFile():
    """Чтение из файла"""
    def __init__(self):
        
        self.file_r = 'val_kWt.txt'
        list_value_end = self.read_file(self.file_r)
                        
        self.print_file(list_value_end)
    
    def read_file(self, file_r):
        list_values_end = []
        vk = open(file_r, 'r')
        list_values = vk.readlines()
 
        for list_value in list_values:
            list_values_end.append(list_value.rstrip())
        
        vk.close()
        print(list_values_end)
         
        return list_values_end
        
    def print_file(self, list_values_end):
        print(list_values_end)

examp = ReadFile()