gistfile1.txt

import sys


class Menu:

    def __init__(self):
        self.developers = []
        self.choices = {
            "1": self.add_developer,
            "2": self.add_skill,
            "3": self.show_all,
            "4": self.exit
        }

    def run(self):
        while True:
            print('-'*40)
            print("1: Add developer\n"
                  "2: Add skill to a developer\n"
                  "3: Show all developers\n"
                  "4:Exit")
            action = input("input your action you need: ")
            if self.choices.get(action):
                self.choices.get(action)()
            print('-'*40)

    def add_developer(self):
        name = input("Enter name: ")
        family = input("Enter family: ")
        age = input("Enter age: ")
        city = input("Enter city: ")
        self.developers.append(Developer(name, family, age, city))

    def add_skill(self):
        self.show_all()
        id = int(input('Enter id: '))
        self.developers[id].add_skill()

    def show_all(self):
        print('{:3} | {:15} | {:15} | {:5} | {:10} | {:30}'.format("ID", "Name", "Family", "Age", "City", "Skills"))
        for i, developer in enumerate(self.developers):
            s = '{0:3} | {1:15}'.format(i, str(developer))
            print(s)

    @staticmethod
    def exit():
        sys.exit()


class Developer:

    def __init__(self, name, family, age, city, skills=[]):
        self.name = name
        self.family = family
        self.age = age
        self.city = city
        self.skills = skills

    def add_skill(self):
        skill = input('Enter skill: ')
        self.skills.append(skill)

    def __str__(self):
        return '{:15} | {:15} | {:5} | {:10} | {:30}'.format(self.name, self.family, self.age, self.city, ", ".join(self.skills))

Menu().run()