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Overview

This exercise implements a full CRUD (Create, Read, Update, Delete) system for managing coder records. You’ll work with lists of dictionaries, create a menu-driven interface, and perform all four fundamental database operations.
Difficulty Level: IntermediateConcepts Covered: Lists, dictionaries, while loops, menu systems, data manipulation, indexing

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What You’ll Learn

1

Working with Complex Data Structures

Manage lists containing dictionaries to represent structured data
2

CRUD Operations

Implement Create, Read, Update, and Delete functionality
3

Menu-Driven Programs

Build an interactive menu system using while loops
4

Data Indexing

Use indices to access and modify specific records in a list

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Complete Code

Here’s the full CRUD system implementation: 
coders=[
    {
        "nombre":"Javier",
        "edad":25,
        "riwipoints":4
    },
    {
        "nombre":"lucas",
        "edad":18,
        "riwipoints":8
    },
    {
        "nombre":"pablo",
        "edad":30,
        "riwipoints":5
    },
    {
        "nombre":"judas",
        "edad":19,
        "riwipoints":0
    },
    {
        "nombre":"mateo uno",
        "edad":36,
        "riwipoints":9
    }
]

while True:
    print("""
    MENU
    (1) registrar un nuevo coder

    (2) actualizar coder

    (3) eliminar coder

    (4) listar coders

    (5) cerrar programa
    """)

    opcionMenu=input("INGRESA LA OPCION=>")
    if opcionMenu=="1":
        nombre=input("ingresa el nombre del coder=>")
        edad=int(input("ingresa la edad del coder=>"))
        riwipoints=int(input("ingresa los riwipoints del coder=>"))

        nuevoCoder={
            "nombre":nombre,
            "edad":edad,
            "riwipoints":riwipoints
        }

        coders.append(nuevoCoder)
    elif opcionMenu=="2":
        indice=0
        for coder in coders:
            #mostrar informacion de coders
            print(f"""
                id=[{indice}]
                Nombre={coder["nombre"]}
                Edad={coder["edad"]}
                Riwipoints={coder["riwipoints"]}
                """)
            indice+=1

        #pedimos los nuevos datos   
        coderParaActualizar=int(input("ingresa el id del coder que quieres actualizar=>"))
        nuevoNombre=input("ingresa el nuevo nombre del coder=>")
        nuevaEdad=int(input("ingresa la nueva edad del coder=>"))
        nuevosRiwipoints=int(input("ingresa los nuevos riwipoints del coder=>"))

        #actualizar los nuevos datos
        coders[coderParaActualizar]["nombre"]=nuevoNombre
        coders[coderParaActualizar]["edad"]=nuevaEdad
        coders[coderParaActualizar]["riwipoints"]=nuevosRiwipoints
    elif opcionMenu=="3":
        indice=0
        for coder in coders:
            print(f"id=[{indice}] - {coder["nombre"]}")
            indice+=1

        coderAeliminar=int(input("ingrese el ID del coder que quiere eliminar"))
        del coders[coderAeliminar]
    elif opcionMenu=="4":
        print("lista de coders")
        for coder in coders:
            print(f"""
                NOMBRE CODER= {coder["nombre"]}
                EDAD= {coder["edad"]}
                RIWIPOINTS= {coder["riwipoints"]}
                """)
    elif opcionMenu=="5":
        print("aca vamos a cerrar")
        break
    else:
       print("ingresastes una opcion invalida")

​
Code Breakdown

​
Section 1: Initial Data Structure

coders=[
    {
        "nombre":"Javier",
        "edad":25,
        "riwipoints":4
    },
    # ... more coders
]
Data Structure: A list of dictionaries. Each dictionary represents a coder with three properties: nombre (name), edad (age), and riwipoints (points). This structure allows easy access to individual properties while keeping related data together.

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Section 2: Main Menu Loop

while True:
    print("""
    MENU
    (1) registrar un nuevo coder
    (2) actualizar coder
    (3) eliminar coder
    (4) listar coders
    (5) cerrar programa
    """)
    opcionMenu=input("INGRESA LA OPCION=>")
The while True loop creates an infinite loop that keeps the program running until the user explicitly chooses to exit (option 5). This pattern is common in menu-driven applications where you want continuous interaction until the user decides to quit.

​
Section 3: CREATE Operation

if opcionMenu=="1":
    nombre=input("ingresa el nombre del coder=>")
    edad=int(input("ingresa la edad del coder=>"))
    riwipoints=int(input("ingresa los riwipoints del coder=>"))

    nuevoCoder={
        "nombre":nombre,
        "edad":edad,
        "riwipoints":riwipoints
    }

    coders.append(nuevoCoder)
1

Collect Input

Gather all necessary information from the user
2

Create Dictionary

Build a new dictionary object with the collected data
3

Add to List

Use .append() to add the new coder to the end of the list

​
Section 4: UPDATE Operation

elif opcionMenu=="2":
    indice=0
    for coder in coders:
        print(f"""
            id=[{indice}]
            Nombre={coder["nombre"]}
            Edad={coder["edad"]}
            Riwipoints={coder["riwipoints"]}
            """)
        indice+=1

    coderParaActualizar=int(input("ingresa el id del coder que quieres actualizar=>"))
    nuevoNombre=input("ingresa el nuevo nombre del coder=>")
    nuevaEdad=int(input("ingresa la nueva edad del coder=>"))
    nuevosRiwipoints=int(input("ingresa los nuevos riwipoints del coder=>"))

    coders[coderParaActualizar]["nombre"]=nuevoNombre
    coders[coderParaActualizar]["edad"]=nuevaEdad
    coders[coderParaActualizar]["riwipoints"]=nuevosRiwipoints
Index Tracking: The indice variable manually tracks the position of each coder. This allows users to reference coders by a numeric ID. The update uses bracket notation to modify dictionary values directly.

​
Section 5: DELETE Operation

elif opcionMenu=="3":
    indice=0
    for coder in coders:
        print(f"id=[{indice}] - {coder["nombre"]}")
        indice+=1

    coderAeliminar=int(input("ingrese el ID del coder que quiere eliminar"))
    del coders[coderAeliminar]
The del statement removes an element from the list at the specified index. After deletion, all subsequent elements shift down one position.

​
Section 6: READ Operation

elif opcionMenu=="4":
    print("lista de coders")
    for coder in coders:
        print(f"""
            NOMBRE CODER= {coder["nombre"]}
            EDAD= {coder["edad"]}
            RIWIPOINTS= {coder["riwipoints"]}
            """)
This simple loop iterates through all coders and displays their information in a formatted way.

​
Section 7: Exit and Error Handling

elif opcionMenu=="5":
    print("aca vamos a cerrar")
    break
else:
   print("ingresastes una opcion invalida")
The break statement exits the while loop, ending the program. The else clause catches any invalid menu options.

​
How to Run

1

Save the File

Save the code in a file named crud_coders.py
2

Run the Program

Execute from your terminal:
python crud_coders.py
3

Interact with the Menu

  • Choose option 1 to add a new coder
  • Choose option 2 to update an existing coder
  • Choose option 3 to delete a coder
  • Choose option 4 to view all coders
  • Choose option 5 to exit

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Example Usage

MENU
(1) registrar un nuevo coder
(2) actualizar coder
(3) eliminar coder
(4) listar coders
(5) cerrar programa

INGRESA LA OPCION=>1
ingresa el nombre del coder=>Maria
ingresa la edad del coder=>28
ingresa los riwipoints del coder=>7

MENU
(1) registrar un nuevo coder
(2) actualizar coder
(3) eliminar coder
(4) listar coders
(5) cerrar programa

INGRESA LA OPCION=>4
lista de coders

NOMBRE CODER= Javier
EDAD= 25
RIWIPOINTS= 4

NOMBRE CODER= lucas
EDAD= 18
RIWIPOINTS= 8

... [more coders]

NOMBRE CODER= Maria
EDAD= 28
RIWIPOINTS= 7

​
Enhancement Ideas

  1. Data Persistence: Save data to a JSON file so it persists between program runs
  2. Search Functionality: Add a search feature to find coders by name or other criteria
  3. Input Validation: Prevent negative ages or invalid riwipoints values
  4. Sorting: Add options to sort coders by name, age, or points
  5. Confirmation Dialogs: Ask for confirmation before deleting records
  6. Unique IDs: Use UUID or auto-increment IDs instead of list indices
  7. Error Handling: Use try-except blocks to handle IndexError when accessing invalid indices

​
Common Issues and Solutions

Problem: User enters an ID that doesn’t exist.Solution: Validate the index before accessing:
if 0 <= coderParaActualizar < len(coders):
    # perform update
else:
    print("ID invalido")
Problem: User enters non-numeric input for age or riwipoints.Solution: Add try-except blocks:
try:
    edad = int(input("ingresa la edad del coder=>"))
except ValueError:
    print("Por favor ingresa un número válido")

​
Key Takeaways

  • Lists of dictionaries are excellent for managing collections of structured data
  • CRUD operations form the foundation of most data management systems
  • Menu-driven programs use while loops and conditional statements for user interaction
  • Index tracking allows users to reference specific records by ID
  • The del statement removes elements from lists
  • Dictionary keys can be accessed and modified using bracket notation
  • Breaking down complex operations into clear steps improves code readability

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