file_name = 'my_text.txt'
class ReadFile:
    
    def __init__(self, file_name):
        pass
    
    def __iter__(self):
        pass
    
    def __next__(self):
        pass

  
class It:
    def __init__(self, file_name):
        self.file_name = file_name
        self.fin = None
     
    def __iter__(self):
        self.fin = open(self.file_name, encoding='utf-8')
        return self.fin
     
    def __next__(self):
        try:
            line = next(self.fin)
        except StopIteration:
            self.fin.close()
            self.fin = None
            raise
        return line
 
it = It('/etc/passwd')
 
for i in it:
    print(i)
 
for i in it:
    print(i)