python_exercises/thinkcspy/Chapter-16-Exercises/Problem5_fibonacci.py

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Python

# Runestone.Academy thinkcspy course
# Chapter 16
# Problem 5
def fibonacci(number):
if number < 0:
return
elif number == 0 or number == 1:
return number
else:
number = fibonacci(number - 1) + fibonacci(number - 2)
return number
print(fibonacci(10))