Merge pull request 4GeeksAcademy#60 from josemoracard/jose9-add-exercise-21-average

añadido ejercicio 021

Author: alesanchezr

exercises/021-square_root/README.es.md

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+# `021` square root
+
+## 📝 Instrucciones:
+
+1. Crea una función llamada `square_root()`, que reciba un número como parámetro y devuelva la raíz cuadrada del número dado.
+
+2. Si el número resultante tiene decimales, solo conserva los 2 primeros.
+
+## 📎 Ejemplo de entrada:
+
+```py
+square_root(50)
+```
+
+## 📎 Ejemplo de salida:
+
+```py
+7.07
+```
+
+## 💡 Pistas:
+
++ Recuerda que el módulo `math` es una herramienta muy útil.
+
++ Para conservar el número deseado de decimales en un número dado, puedes utilizar el método `round()`.

exercises/021-square_root/README.md

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+# `021` square root
+
+## 📝 Instructions:
+
+1. Create a function named `square_root()`, which receives a number as a parameter and returns the square root of the given number.
+
+2. If the resulting number has decimals, please only keep the first 2.
+
+## 📎 Example input:
+
+```py
+square_root(50)
+```
+
+## 📎 Example output:
+
+```py
+7.07
+```
+
+## 💡 Hints:
+
++ Remember, the `math` module is a very useful tool.
+
++ To keep the desired number of decimals in a given number, you can use the `round()` method.

exercises/021-square_root/app.py

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+# Your code here

exercises/021-square_root/solution.hide.py

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+# Your code here
+import math
+
+def square_root(number):
+ result = round(math.sqrt(number), 2)
+ return result
+
+
+print(square_root(50))

exercises/021-square_root/test.py

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+import io, sys, os, re, pytest
+import app
+
+@pytest.mark.it('You should create a function named square_root')
+def test_square_root_exists(app):
+ try:
+ from app import square_root
+ assert square_root 
+ except AttributeError:
+ raise AttributeError("The function 'square_root' should exist on app.py")
+
+@pytest.mark.it('The function must return something')
+def test_function_return(capsys, app):
+ assert app.square_root(25) != None
+
+@pytest.mark.it('The function must return a float number')
+def test_function_return_type(capsys, app):
+ assert type(app.square_root(25)) == type(1.0)
+
+@pytest.mark.it('Testing the function square_root with the number 50, it should return 7.07')
+def test_square_root_50(app):
+ try:
+ assert app.square_root(50) == 7.07
+ except AttributeError:
+ raise AttributeError("The function 'square_root' should return the value 7.07")
+
+@pytest.mark.it('Testing the function square_root with the number 2.25, it should return 1.5')
+def test_square_root_2_25(app):
+ try:
+ assert app.square_root(2.25) == 1.5
+ except AttributeError:
+ raise AttributeError("The function 'square_root' should return the value 1.5")
+
+@pytest.mark.it('Testing the function square_root with the number 0, it should return 0')
+def test_square_root_0(app):
+ try:
+ assert app.square_root(0) == 0
+ except AttributeError:
+ raise AttributeError("The function 'square_root' should return the value 0")