02. Python

Exercise 1:

Write a function that counts how many vowels are in a string.

Exercise 2:

Write a function that calculates the factorial of a number. hhttps://youtu.be/_M3wXajn36w   https://trinket.io/python/eef0c4957a84  

Exercise 3:

Write a function that takes two numbers and an operator (+, -, *, /) and returns the result. 

Exercise 4:

Write a function that:

• Takes a sentence

• Returns a dictionary with the count of each word