Lettuce Example Python BDD

test.py

from lettuce import *

@step('I have the number (\d+)')
def have_the_number(step, number):
    world.number = int(number)

@step('I compute its fibonacci')
def compute_its_fibonacci(step):
    world.number = fibonacci(world.number)

@step('I see the number (\d+)')
def check_number(step, expected):
    expected = int(expected)
    assert world.number == expected

def fibonacci(number):
    number = int(number)
    if (number == 0) or (number == 1):
        return 1
    else:
        return fibonacci(number-1) + fibonacci(number-2)
~