Apuntes_Python/02_conceptos/README.md

# Ejemplos de Implementación

### Implementación practica

  1. [Lists](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#listas)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#user-content-crear-lista)  
    - [Recorrer](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#user-content-explorar-lista)  
    - [Edición](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#user-content-editar-lista)  
    - [Copia](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#user-content-copiar-lista)  
    - [Compensión de listas](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/01_lists/README.md#user-content-comprensi%C3%B3n-de-listas)  

  2. [Tuples](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#tuplas)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-creación)  
    - [Indice](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-indice)  
    - [Operaciónes sobre tuplas](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-operaciones-sobre-tuplas)  
    - [Slicing](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-slicing)  
    - [Empaquetado y Desempaquetado](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-empaquetado-y-desempaquetado-de-tuplas)  
    - [Comparativa lista-tupla](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/02_tuples#user-content-comparativa-entre-lista-y-tupla)  

  3. [Dictionary](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#diccionarios)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-creaci%C3%B3n-de-diccionario)  
    - [Comprensión de diccionario](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-comprensi%C3%B3n-de-diccionario)  
    - [Llaves](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-llaves)  
    - [Operaciones sobre diccionarios](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-operaciones-sobre-diccionarios)  
    - [Recorrer, iterar](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-recorrer%2C-iterar-diccionario)  
    - [Copia](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-copiar-diccionario)  
    - [Fusión de diccionarios](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/03_dictionaries#user-content-fusi%C3%B3n-de-diccionarios)  

  4. [Sets](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#sets)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#crear-set)  
    - [Operaciones sobre sets](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#operaciones-sobre-sets)  
    - [set() por comprensión](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#set-por-comprensi%C3%B3n)  
    - [unión, intersección y diferencia](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#union-intersecci%C3%B3n-y-diferencia)  
    - [Copia](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#copiar-sets)  
    - [frozenset()](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/04_sets#frozenset)  

  5. [Strings](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#string)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Creaci%C3%B3n)  
    - [Inmutabilidad](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Inmutables)  
    - [join()](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#join)  
    - [Indice](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Indice)  
    - [Iterar string](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Iterar-string)  
    - [Funciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Funciones)  
    - [Slicing](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Slicing)  
    - [Formateo de strings](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/05_strings#Formateo-de-strings)  

  6. [Collections](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#modulo-collections)  
    - [Counter](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#counter)  
    - [namedtuple](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#namedtuple)  
    - [OrderedDict](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#ordereddict)  
    - [defaultdict](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#defaultdict)  
    - [deque](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#deque)  
    - [ChainMap](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#chainmap)  
    - [UserDict](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#userdict)  
    - [UserString](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#userstring)  
    - [UserList](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/06_collections#userlist)  

  7. [Itertools](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#itertools)  
    - [product](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#product)  
    - [permutations](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#permutations)  
    - [combinations, combinations_with_replacement](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#combinations)  
    - [accumulate (multiplicación, max)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#accumulate)  
    - [groupby](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#groupby)  
    - [infinite iterators (count, cycle, repeat)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/07_itertools#infinite-iterators)  

  8. [Funciones Lambda](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#lambda)  
    - [Funciónes varias](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#funci%C3%B3n-que-recibe-un-n%C3%BAmero-y-retorna-este-mas-10)  
    - [Función que ordena](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#ordenar)  
    - [Lambda y map](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#map-funci%C3%B3n-secuencia)  
    - [Lambda y filter](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#filter-funci%C3%B3n-secuencia)  
    - [Lambda y reduce](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/08_lambda_functions#reduce-funci%C3%B3n-secuencia)  

  9. [Errores y Excepciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#errores-y-excepciones)  
    - [Error de sintaxis \*SyntaxError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-sintaxis)  
    - [Error de tipo \*TypeError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-tipo)  
    - [Error de importación \*ModuleNotFoundError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-importaci%C3%B3n)  
    - [Error de nombre \*NameError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-nombre)  
    - [Error archivo no encontrado \*FileNotFoundError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-archivo-no-encontrado)  
    - [Error de valor \*ValueError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-valor)  
    - [Error de indice \*IndexError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-indice)  
    - [Error de llave \*KeyError\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#error-de-llave)  
    - [Levantar una excepción](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#levantar-una-excepci%C3%B3n)  
    - [Assert](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#assert)  
    - [Manejo de excepciones (try, except, else, finally)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#manejo-de-excepciones)  
    - [Definir excepciones y clases de error propias.(BaseException subClass)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/09_exceptions_and_errors#definir-excepciones-propias)  

  10. [Logging](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#logging)  
    - [Logger personalizado](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#logger-personalizado)  
    - [Registro de eventos/sucesos (logging)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#registro-de-eventos-sucesos-logging)  
    - [Logging con archivo de configuración](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#registro-de-eventos-sucesos-logging)  
    - [Captura de stack traces](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#captura-de-stack-traces)  
    - [RotatingFileHandler](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#captura-de-stack-traces)  
    - [TimedRotatingFileHandler](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/10_logging#timedrotatingfilehandler)  
  
  11. [JSON](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#javascript-object-notation)  
    - [Ejemplo json](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#ejemplo-json)  
    - [Serializing - Encoding](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#serializing-encoding)  
    - [Deserializing - Decoding](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#deserializing-decoding)  
    - [Otra forma de decodificar](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#otra-forma-de-codificar)  
    - [Tabla de conversión Python/JSon](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/11_JSON#tabla-de-conversion-formatos)  
  
  12. [Random Numbers](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/12_random_numbers#numeros-aleatorios)  
    - [Módulo Random](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/12_random_numbers#generar-n%C3%BAmeros-seudo-aleatorios)  
    - [Módulo Secret](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/12_random_numbers#secrets)  
    - [Módulo NumPy](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/12_random_numbers#numpy)  
  
  13. [Decorators](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/13_decorators#decoradores)  
    - [Decoradores de Funciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/13_decorators#decoradores-de-funciones)  
    - [Decoradores de Clases](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/13_decorators#decoradores-de-clases)  
  
  14. [Generadores](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/14_generators#generadores)  
    - [Creación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/14_generators#creaci%C3%B3n)  
    - [Fuera de rango \*StopIteration\*](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/14_generators#valores-fuera-de-rango)  
    - [Ahorro de memoria](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/14_generators#ejemplo-de-uso-para-ahorro-de-memoria)  
    - [Fibonacci](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/14_generators#ejemplo-secuencia-fibonacci)  
  
  15. [Threading vs Multiprocessing](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/15_threading_vs_multiprocessing#threading-y-multiprocessing)  
    - [Multiprocessing](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/15_threading_vs_multiprocessing#multiprocessing)  
    - [Threading](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/15_threading_vs_multiprocessing#threading)  
  
  16. [Multithreading](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/16_multithreading#threading)  
    - [Memoria compartida entre hilos](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/16_multithreading#compartiendo-memoria-entre-hilos)  
    - [Queue/Cola](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/16_multithreading#queue)  
  
  17. [Multiprocessing](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/17_multiprocessing#multiprocessing)  
    - [Uso de 'lock' para prevenir 'race-conditions'](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/17_multiprocessing#lock)  
    - [Uso de 'queue'](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/17_multiprocessing#queue)  
    - [Pool/Administrar multiples procesos](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/17_multiprocessing#pool)
  
  18. [Argumentos de Funciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/18_function_arguments#argumentos-de-funciones)  
    - [Argumentos de funciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/18_function_arguments#tipos-de-argumentos-de-funciones)  
    - [Desempaquetando argumentos](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/18_function_arguments#desempaquetando-argumentos)  
    - [Variables globales y locales](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/18_function_arguments#variables-globales-y-locales)  
    - [Paso de parametros](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/18_function_arguments#paso-de-parametros)  
  
  19. [Operador Asterisco (\*)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#operador)  
    - [Multiplicación](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#multiplicaci%C3%B3n)  
    - [Potencia/Exponente](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#potencia)  
    - [Creacion de lista, tupla o string](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#crear-lista-con-elementos-repetidos)  
    - [Desempaquetando listas, tuplas o diccionarios en argumentos de funciones](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#desempaquetando-lista-y-tupla-en-argumentos-de-funcion)  
    - [Desempaquetando contenedores](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#desempaquetando-contenedor)  
    - [Fusionando contenedor en una lista o diccionario](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#fusionando-contenedor-en-una-lista-tupla-y-set)  
    - [Fusionando diccionarios](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/19_asterisk_operator#fusionando-diccionarios)  
  
  20. [Shallow vs Deep Copying](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/20_shallow_vs_deep_copying#copia-de-elementos)  
    - [Copia de elementos mutables con el modulo 'copy'](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/20_shallow_vs_deep_copying#copia-lista)  
    - [Diferencias entre copia superficial y copia profunda (shallow & deep copying)](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/20_shallow_vs_deep_copying#copia-superficial-shallow-y-profunda-deep)  
    - [Copia de Clases y Objetos](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/20_shallow_vs_deep_copying#copiando-clases)  
  
  21. [Context Managers](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/21_context_managers#context-manager)  
    - [Ejemplo](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/21_context_managers#ejemplo-de-context-manager)  
    - [Implementación como clase personalizada](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/21_context_managers#implem-de-context-manager-como-clase-personalizada)  
    - [Implementación como función](https://gitea.kickto.net/devfzn/Apuntes_Python/src/branch/master/02_conceptos/21_context_managers#implementacion-de-context-manager-como-funci%C3%B3n)  

------  
  

## Recordatorio Operadores 
  
Operador | Operación Aritmética
-:|-
**` + `** | Suma
**` % `** | Resto/Modulo
**` - `** | Resta
**` / `** | División
**`//`**  | División sin decimales
**` * `** | Multiplicación
**` ** `**| Exponencial
**Operador** | **Comparación**
**` == `** | Igual que
**` != `** | Distinto de
**` > `** | Mayor que
**` < `** | Menor que
**` >= `** | Mayor o igual que
**` <= `** | Menor o igual que
**Operador** | **Logica**
**`and`** | y,  &&
**`or`** | o, ||
**`not`** | no, !
**Operador** | **Asignación**
**` += `** | Suma y asigna
**` -= `** | Resta y asigna
**` *= `** | Multiplica y asigna
**` /= `** | Divide y asigna
**` %= `** | Obtiene el modulo y asigna
**` **= `** | Calcula exponente y asigna
**` //= `** | Calcula division justa y asigna
**Operador** | **Especial**
**` is `** | Retorna True si ambas variables son el mismo objeto
**`is not`** | Retorna True si ambas variables no son el mismo objeto
**` in `** | esta en/pertenece a, retorna True de se cierto
**`not in`** | no esta en/no pertence, retorna True de ser cierto
**Operador** | **Bitwise/bit a bit**
**` & `** | `AND` Establece cada bit como `1` si ambos bits son `1`
**` \| `** | `OR` Establece cada bit como `1` si uno de los 2 bits es `1`
**` ^ `** | `XOR` Establece cada bit como `1` si solo uno de los 2 bits es `1`
**` ~ `** | `NOT` Invierte todos los bits
**` << `** | `zero fill left shift` Shift left by pushing zeros in from the right <br>and let the leftmost bits fall off
**` >> `** | `signed right shift` Shift right by pushing copies of the leftmost bit<br> in from the left, and let the rightmost bits fall off

[Youtube/freeCodeCamp.org](https://www.youtube.com/watch?v=HGOBQPFzWKo)