Here is my code

person = input("Enter a name which will be added to the list: ")+ "n"

file = open("members.txt", "w")
people = file.readlines()
file.close()
people.append(person)

file = open("todos.txt", "w")
file.writelines(people)
file.close()

What I want to do is that when I input a name, the name get’s added to the “members.txt” file, but I get this error:

Traceback (most recent call last):
  File "C:UsersprincOneDriveDokumentePythonNeuer OrdnerITTodo AppÜbungen.py", line 4, in <module>
    people = file.readlines()
             ^^^^^^^^^^^^^^^^
io.UnsupportedOperation: not readable

what did I do wrong?