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Commit 73aeec4

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Merge pull request #53 from josemoracard/jose3-05-defining-vs-calling-a-function
exercise 05-defining-vs-calling-a-function
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‎exercises/05-Defining-vs-Calling-a-function/README.es.md‎

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# `05` Definir vs llamar a una función
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# `05` Defining vs Calling a Function
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Las funciones solo existen si tú u otra persona las define... es la única forma en que el compilador/intérprete de idiomas sabe que existen, por lo tanto, puede ejecutarlas cuando las llama.
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Las funciones solo existen si tú u otra persona las define... es la única forma en que el compilador/intérprete de lenguaje sabe que existen, por lo tanto, puede ejecutarlas cuando las llamas.
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Para definir una función necesitamos escribir esta fórmula básica de código:
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```python
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def myFunctionName(parameter, parameter2, ...parameterX):
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# codigo de la función aquí
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return something
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def nombre_de_funcion(parametro1, parametro2, ...parametroX):
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# Código de la función aquí
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return algo
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```
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La palabra `def` es una palabra reservada en Python, esto significa que solo se usa para definir una función.
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*Consejo:* usa un nombre descriptivo (no intentes ahorrar palabras, usa tantas como necesites) de esta manera entenderás lo que hace la función (y lo que devuelve).
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Nombres de ejemplo: `add_two_integers` (suma dos números enteros), `calculate_taxes` (calcular impuestos), `get_random_number` (obtener número aleatorio), etc.
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Nombres de ejemplo: `add_two_integers` (suma dos números enteros), `calculate_taxes` (calcular impuestos), `get_random_number` (obtener número aleatorio), etc.
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**Parámetros:** puedes definir tantos parámetros como desees, más aún, si los necesitas.
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**Parámetros:** puedes definir tantos parámetros como desees, más aún, si los necesitas. La cantidad de parámetros dependerá de las operaciones realizadas dentro de la función.
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La cantidad de parámetros dependerá de las operaciones realizadas dentro de la función.
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Ejemplo: si la función está sumando dos enteros (3 + 4), esto significa que la función necesitará dos parámetros (uno para cada entero).
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Ejemplo: si la función está sumando dos enteros (a + b), esto significa que la función necesitará dos parámetros (uno para cada entero).
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**Alcance:** Todo el código que contenga la función debe tener una sangría a la derecha, todo lo que esté en una sangría diferente no será considerado como parte de la función, a esto se llama **alcance**, y puede ser local (dentro de la función) y global (fuera de la función).
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```python
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def concatenate_number_to_string(local_number, local_string):
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local_variable = local_string+""+str(local_number)
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local_variable = local_string+str(local_number)
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return local_variable
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```
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‎exercises/05-Defining-vs-Calling-a-function/README.md‎

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tutorial: "https://www.youtube.com/watch?v=fz4ttmwZWuc"
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---
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# `05` Defining vs Calling a function
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# `05` Defining vs Calling a Function
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Functions will only exists if you or somebody else defines them... it is the only way the language compiler/interpreter knows they exist, therefore it's able to run them when you call them.
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Functions will only exist if you or somebody else defines them; it is the only way the language compiler/interpreter knows they exist, therefore it's able to run them when you call them.
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To define a function we need to write this basic code formula:
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To define a function, we need to write this basic code formula:
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```python
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def myFunctionName(parameter, parameter2, ...parameterX):
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# the function code here
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def my_function_name(parameter1, parameter2, ...parameterX):
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# The function code here
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return something
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```
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The word `def` is a reserved word in Python, this means it is only used to define a function.
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**The name** of the function could be anything you like.
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Tip: use a descriptive name (don't be cheap with words,
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use as many as you need) this way you will understand what the function
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does -and returns-.
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Example names: add_two_integers , calculate_taxes , get_random_number, etc.
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**The name** of the function could be anything you like. Tip: Use a descriptive name (don't be cheap with words, use as many as you need); this way, you will understand what the function does -and returns-.
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**Parameters:** you can define as many parameters as you like or need.
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The amount of parameters will depend on the operations done inside the function,
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I.E: if the function is adding two integers `(3 + 4)` this means the function
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will need two parameters (one for each integer).
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Example names: `add_two_integers`, `calculate_taxes`, `get_random_number`, etc.
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**Scope:** All the code that the function will contain need to be indented
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one tab to the right, anything on a different indentation
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won't be considered as part of the function,
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this is called **the scope**, and it could be local (inside the function)
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and global (outside of the function).
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**Parameters:** You can define as many parameters as you like or need. The amount of parameters will depend on the operations done inside the function. I.E: If the function is adding two integers `(a + b)` this means the function will need two parameters (one for each integer).
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**The Return**: not every function needs to return something, but it is recommended that it does.
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Tip: returning `None` is a good default for when you, still, don't know if you need to return something.
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**Scope:** All the code that the function will contain needs to be indented one tab to the right, anything on a different indentation won't be considered as part of the function. This is called **the scope**, and it could be local (inside the function) and global (outside the function).
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**The Return**: not every function needs to return something, but it is recommended that it does. Tip: returning `None` is a good default for when you still don't know if you need to return something.
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Example of a function:
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```python
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def concatenate_number_to_string(local_number, local_string):
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local_variable = local_string+""+str(local_number)
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local_variable = local_string+str(local_number)
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return local_variable
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```
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# 📝 Instructions:
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## 📝 Instructions:
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1. Define a function called `multi`.
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2. The `multi` function receives two numbers.
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3. Return the result of the multiplication between them.
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## 💡 Hint
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## 💡 Hint:
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+ Remember to add the `return` line. Every function should return something, in this case it should be the result of the multiplication.
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+ Remember to add the `return` line. Every function should return something, in this case, it should be the result of the multiplication.
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# Define the function called "multi" that expects 2 parameters:
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# Define below the function called "multi" that expects 2 parameters
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# don't edit anything below this line
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# Don't edit anything below this line
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return_value = multi(7,53812212)
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print(return_value)
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print(return_value)
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# Define the function called "multi" that expects 2 parameters:
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def multi(num1, num2):
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# Define below the function called "multi" that expects 2 parameters
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def multi(num1, num2):
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total = num1 * num2
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return total
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# don't edit anything below this line
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# Don't edit anything below this line
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return_value = multi(7,53812212)
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print(return_value)
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print(return_value)

‎exercises/05-Defining-vs-Calling-a-function/tests.py‎

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import io, sys, pytest, os, re, mock
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@pytest.mark.it("Create a function 'multi'")
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@pytest.mark.it("Create the function 'multi'")
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def test_declare_variable():
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path = os.path.dirname(os.path.abspath(__file__))+'/app.py'
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with open(path, 'r') as content_file:
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def test_for_integer(capsys, app):
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assert app.multi(3,4) == 12
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@pytest.mark.it('The function multi must receive two numbers and return their multiplication. Testing with different values.')
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@pytest.mark.it('The function multi must receive two numbers and return their multiplication. Testing with different values')
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def test_for_function_return(capsys, app):
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assert app.multi(10, 6) == 60
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assert app.multi(10, 6) == 60

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