How to populate Objects in a an existing file [closed]

by 

class People:

    def __init__(self, fname=None, lname=None, age=None, gender=None):
        self.fname = fname
        self.lname = lname
        self.age = age
        self.gender = gender

def display(self):
    print self.fname

people = [People('John','W Cooper',23,'Male'),
           People('James','W Cooper',30,'Male'),
           People('Kate','W Cooper',20,'Female')]
f = open("abc.txt", "w")
for person in people:
    f.write( person.fname +","+ person.lname +","+ str(person.age) +","+ person.gender + '\n' )
    person.display()
f.close()

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