Introduction
Function basics
More advanced concepts
Instruction
Perfect! Now, it's your turn to write a function that returns None.
Exercise
Write a function named sum_between that will take two arguments – a and b – and will return the sum of all integers from a to b (inclusive). For instance:
sum_between(1, 4) = 1 + 2 + 3 + 4 = 10
However, if b < a, return None. Test your function by computing the sum of numbers between 1 and 3.
Stuck? Here's a hint!
Use a loop:
for i in range (a, b+1):
