Fizz and buzz of computer programs in python.

Fizz and Buzz
of
Computer Programs
in Python.
esehara shigeo

Shigeo Esehara
Just a Programmer using Python
and
Love Trivial Programming

!! WARNING !!
I guess you get used to my funny English Speaking.
(or Programming ?)

Before,
Programmers had
“The Common Sense”...

Jeff Atword
(ex-StackOverFlow)
wrote the essay:
Why Can't Programmers..
Program?

Now,
Programmer has
“The Common Sense”...

FizzBuzz Rule
● Write a program that prints the
numbers from 1 to 100.
● For multiples of three print “Fizz”
instead of the number
● For multiples of five print “Buzz”.
● For numbers which are multiples of
both three and five print “FizzBuzz”

Haskell :: Maybe Monads FizzBuzz
type IsFizzBuzz = Maybe String
is_n:: Integer -> Integer -> Integer
is_n x y = x `mod` y
fizz :: Integer -> Integer
fizz x = is_n x 3
buzz :: Integer -> Integer
buzz x = is_n x 5
maybe_div :: Integer -> String -> IsFizzBuzz ->
IsFizzBuzz
maybe_div 0 str m = case m of
Nothing -> Just str
Just x -> Just $ str ++ x
maybe_div _ str m = m
maybe_fizz :: Integer -> IsFizzBuzz -> IsFizzBuzz
maybe_fizz x m = maybe_div is_fizz "Fizz" m
where is_fizz = fizz x
maybe_buzz :: Integer -> IsFizzBuzz -> IsFizzBuzz
maybe_buzz x m = maybe_div is_buzz "Buzz" m
where is_buzz = buzz x
maybe_fizzbuzz :: Integer -> IsFizzBuzz -> String
maybe_fizzbuzz x m = case m of
Nothing -> show x
Just x -> x
maybe_process :: Integer -> String
maybe_process x = maybe_fizzbuzz x =<< is_fizzbuzz x
where is_fizzbuzz x = maybe_fizz x >>= maybe_buzz x
go :: (Integer -> String) -> IO ()
go f = process f 1
process :: (Integer -> String) -> Integer -> IO ()
process f 101 = putStr ""
process f x = (putStrLn $ f x) >> process f next
where next = x + 1

Real Pythonista
solves
the Problem at 3sec.

Basic
# begin code
for i in range(1, 100):
if (i % 15 == 0):
print "FizzBuzz"
if (i % 3 == 0):
print "Buzz"
if (i % 5 == 0):
print "Fizz"
print i
# end

Real Pythonista
don’t use
“if”statement
in FizzBuzz.

FizzBuzz Structure
consist
“Loop” and “Branch”.

In other words ...
“Loop”
is
“Iteration”.

3 of multiple explession:
[1, 2, 3, 4, 5, 6, 7, 8, 9 …]

Fizzlize!!
[‘’, ‘’, ‘Fizz’,
‘’, ‘’, ’Fizz’,
‘’, ‘’, ’Fizz’
…]

More!!
[‘’, ‘’, ‘Fizz’] * 3
List can be multipication in Python.

“Use type conversion, Luke.”
bool(‘’) = False
int(False) = 0

not use “if” statements
fizz = ['', '', “Fizz”] * 50
buzz = ['', '', '', '', “Buzz”] * 50
for x in range(1, 101):
fizzbuzz = fizz[x] + buzz[x]
number = str(x) * (not bool(fizzbuzz))
print fizzbuzz + number

“It seems bad
because
it generates list
like *malloc*
in C language.”

Real Pythonista
use “itertools”
in FizzBuzz.

Pythonista like ‘itertools’.
from itertools import cycle
fizz = cycle(['', '', 'Fizz'])
buzz = cycle(['', '', '', '', '', 'Buzz'])
for i in range(1, 101):
fizzbuzz = fizz.next() + buzz.next()
fizzbuzz += (str(i) * (not bool(fizzbuzz)))
print fizzbuzz

TRUE Pythonista
don’t use *“List”
in FizzBuzz.
* Strictly speaking,
“String” has “List”(= array (= char sets)) Structure,
but now, String is exception.

Loop
can be created
using “Recurtion”.

Recursion
def loop(start, limit):
print start
(start == limit) or loop(start + 1, limit)
loop(1, 100)

FizzBuzz flag
Fizz, Buzz = [Bool, Bool]

FizzBuzz flag
Fizz, Buzz = [
0 or 1, 0 or 1]

FizzBuzz flag
Number = [0, 0]
Fizz = [1, 0]
Buzz = [0, 1]
FizzBuzz = [1, 1]

“It seems like
binary system.”

Yes !! Binary System.
Number = 00 = 0
Fizz = 01 = 1
Buzz = 10 = 2
FizzBuzz = 11 = 3

Example :: PHP
<?php
function _00($i) { echo $i; }
function _10($i) { echo "Fizz"; }
function _01($i) { echo "Buzz"; }
function _11($i) {
echo _10($i);
echo _01($i);
}
for ($i = 1; $i < 101; $i++) {
$fizz = $i % 3 === 0; $fizz = (int) $fizz;
$fizz = (string) $fizz;
$buzz = $i % 5 === 0; $buzz = (int) $buzz;
$buzz = (string) $buzz;
$fizzbuzz = "_" . $fizz . $buzz;
$fizzbuzz($i);
echo "n";
}

“Use the String, Luke.”
" FizzBuzzFizzBuzz"

“Use the String, Luke.”
" FizzBuzzFizzBuzz"
[ 0 ][ 1 ][2 ][3 ]
* “FizzBuzz” is just only 8 string.

No List !!
def loop(start, limit):
fizzbuzz = (not start % 3) | ((not start % 5) * 2)
print (" FizzBuzz FizzBuzz"[
fizzbuzz * 4:
(fizzbuzz + 1) * 4 + ((fizzbuzz == 3) * 4)].strip()
) or start
(start == limit) or loop(start + 1, limit)
loop(1, 100)

Thanks for
your attention.
twitter: @esehara
github.com/esehara

Fizz and buzz of computer programs in python.

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