""" Implementations of the class Fizz-Buzz problem """

import unittest # TODO:

def fizz_buzz_one( start, end ):

""" Note: This method returns a long string not a list. """

fizzbuzz = ''

# range is NOT inclusive of the 2nd number, so add 1 to include it.

# range(1,4) > 1,2,3. range(1, 4 + 1) > 1,2,3,4.

for i in range(start,end+1):

if i%3 == 0:

fizzbuzz += "fizz"

if i%5 == 0:

fizzbuzz += "buzz"

if i%3 != 0 and i%5 != 0:

fizzbuzz += str(i)

fizzbuzz += ' '

return fizzbuzz.rstrip() # remove trailing whitespace

def fizz_buzz_two( start, end ):

fizzbuzz = []

for i in range(start,end+1):

entry = '' # initialsing an empty string

if i%3 == 0:

entry += "fizz" # concatenating "fizz" to string

if i%5 == 0:

entry += "buzz"

if i%3 != 0 and i%5 != 0:

# this is dynamic typing. reassigning a prev. string to int

entry = i

fizzbuzz.append(entry) # stick entry onto end of list

return fizzbuzz

def fizz_buzz_three( start, end ):

"""

Returns the fizzbuzz string for a given range using an inner

function and a list comprehension.

"""

def int_to_fizzbuzz(i):

""" Output the 'fizzbuzz' string for a single number. """

entry = ''

if i%3 == 0: # if i divided by 3 has no remainder

entry += "fizz"

if i%5 == 0: # if i divided by 5 has no remainder

entry += "buzz"

if i%3 != 0 and i%5 != 0: # i is not divisible by 3 or 5 without remainder

entry = i

return entry

return [int_to_fizzbuzz(i) for i in range(start, end+1)]

def fizz_buzz_four( start, end ):

"""

Fizz buzz showing compact if-elif-else form,

and precalculatio of boolean values.

"""

result = [] # initalising a list to hold our result

for i in range(start, end+1):

fizz = (i % 3 == 0)

buzz = (i % 5 == 0)

if fizz and buzz: result.append('fizzbuzz')

elif fizz: result.append('fizz')

elif buzz: result.append('buzz')

else: result.append(i)

return result

# Unit testing

class fizz_buzz_tests(unittest.TestCase):

def setUp(self):

pass

def test_fizz_buzz_one(self):

self.assertEqual(

fizz_buzz_one(0, 12), "fizzbuzz 1 2 fizz 4 buzz fizz 7 8 fizz buzz 11 fizz"

)

self.assertEqual(fizz_buzz_one(0, 0), "fizzbuzz")

self.assertEqual(fizz_buzz_one(14,16), "14 fizzbuzz 16")

def test_fizz_buzz_two(self):

self.assertEqual(

fizz_buzz_two(5, 12), ['buzz', 'fizz', 7, 8, 'fizz', 'buzz', 11, 'fizz']

)

self.assertEqual(

fizz_buzz_two(5, -2), []

)

def test_fizz_buzz_three(self):

self.assertEqual(

fizz_buzz_three(5, 12), ['buzz', 'fizz', 7, 8, 'fizz', 'buzz', 11, 'fizz']

)

def test_fizz_buzz_four(self):

self.assertEqual(

fizz_buzz_four(5, 12), ['buzz', 'fizz', 7, 8, 'fizz', 'buzz', 11, 'fizz']

)

if __name__ == '__main__':

unittest.main()