Tutorial #7 Python: Registration program using lists and "for" cycle

What Will I Learn?

• How to use the "For" loop to add or modify data to a list
• Validate some user input data
• Create a registration program with name and age

Requirements

• Basic knowledge of programming
• Have Python 3.6.4 installed
• Have Sublime Text or Ninja-IDE installed (optional)

Difficulty

Either choose between the following options:

• Intermediate

Tutorial Contents

Source

import os
name = []
age = []
w = "Welcome to the people register"
option = 5
while option == 5:     #Program menu
    print (w.center(50, "="))
    print ("What would you like to do?")
    print ("1 To create a new record")
    print ("2 To see the current record of people")
    print ("3 To edit a record")
    print ("4 Exit the program")
    while option > 4:       #Verification that the user chooses a valid option
        option = int(input('Select an option from 1 to 4: '))
        if option > 4 or option < 1:
            print ("Enter a correct option (1-4)")

if option == 1:        #Create the list
    reg = int(input("How many people will you register:"))
    for n in range(reg):
        print ("Name of the person number",n+1,":")
        name.append(input())
        print ("Age of the person number",n+1,":")
        age.append(int(input()))
    option = 5
    os.system('cls')

if option == 2:        #See the list of people created
    if name == [] and age == []:        #We check that the lists are not empty
        print ("There is no record created")
        a = input("Press enter to return to the main menu")
        option = 5
        os.system('cls')
    else:
        for n in range(reg):
            print("Person number",n+1,": ", name[n], "Age:", age[n])
        a = input("Press enter to return to the main menu")
        option = 5
        os.system('cls')

if option == 3:       #Modify record
        if name == [] and age == []:        #We check that the lists are not empty
            print ("There is no record created")
            a = input("Press enter to return to the main menu")
            option = 5
            os.system('cls')
        else:
            for k in range (reg):
                print("Person number",k+1,": ", name[k], "Age:", age[k])
            error = 0
            while error == 0:        #We check that it does not exceed the number of records
                b = int(input("Enter the number corresponding to the person you want to modify: "))
                if b > reg or b < 1:
                    print ("Number not valid")
                else:
                    error = 1
            for m in range (reg):
                if m == b - 1:
                    name[m] = input("Write the new name: ")
                    age[m] = int(input("Indicate the new age: "))
            option = 5
            os.system('cls')

import os
name = []
age = []
w = "Welcome to the people register"
option = 5
while option == 5:     #Program menu
    print (w.center(50, "="))
    print ("What would you like to do?")
    print ("1 To create a new record")
    print ("2 To see the current record of people")
    print ("3 To edit a record")
    print ("4 Exit the program")
    while option > 4:       #Verification that the user chooses a valid option
        option = int(input('Select an option from 1 to 4: '))
        if option > 4 or option < 1:
            print ("Enter a correct option (1-4)")
    if option == 1:        #Create the list
        reg = int(input("How many people will you register:"))
        for n in range(reg):
            print ("Name of the person number",n+1,":")
            name.append(input())
            print ("Age of the person number",n+1,":")
            age.append(int(input()))
        option = 5
        os.system('cls')
    if option == 2:        #See the list of people created
        if name == [] and age == []:        #We check that the lists are not empty
            print ("There is no record created")
            a = input("Press enter to return to the main menu")
            option = 5
            os.system('cls')
        else:
            for n in range(reg):
                print("Person number",n+1,": ", name[n], "Age:", age[n])
            a = input("Press enter to return to the main menu")
            option = 5
            os.system('cls')
    if option == 3:       #Modify record
            if name == [] and age == []:        #We check that the lists are not empty
                print ("There is no record created")
                a = input("Press enter to return to the main menu")
                option = 5
                os.system('cls')
            else:
                for k in range (reg):
                    print("Person number",k+1,": ", name[k], "Age:", age[k])
                error = 0
                while error == 0:        #We check that it does not exceed the number of records
                    b = int(input("Enter the number corresponding to the person you want to modify: "))
                    if b > reg or b < 1:
                        print ("Number not valid")
                    else:
                        error = 1
                for m in range (reg):
                    if m == b - 1:
                        name[m] = input("Write the new name: ")
                        age[m] = int(input("Indicate the new age: "))
                option = 5
                os.system('cls')
    if option == 4:
        R = input('Do you really want to leave the program?: y/n ')
        if R == "y":
            os.system('exit')
        else:
            os.system('cls')
            option = 5

Curriculum

• Tutorial #1 Python: Declaración de variables y Tipo de datos
• Tutorial #2 Python: Comentarios y Operadores Aritméticos
• Tutorial #3 Python: Tuplas y Listas
• Tutorial #4 Python: Diccionarios y Operadores Racionales
• Tutorial #5 Python: Operadores lógicos y Control de flujo.
• Tutorial #6 Python: Calculator with menu and data verification using the while loop.

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