DEV Community: QUANON

Lazy FizzBuzz (Python ver.)

QUANON — Fri, 17 Nov 2017 06:45:27 +0000

Recently I wrote a post about FizzBuzz with Ruby. Now I want to do that with Python.

In the previous post, I use Enumerator::Lazy for laziness (which means lazy evaluation for list) with Ruby, and I use generator with Python.

import itertools  # what a great tools 😊


class FizzBuzzRule(object):
  @classmethod
  def say(cls, word):
    return cls(word)

  def __init__(self, word):
    self.word = word

  def for_multiples_of(self, number):
    return itertools.cycle((*itertools.repeat('', number - 1), self.word))


numbers = itertools.count(1)
fizzes = FizzBuzzRule.say('Fizz').for_multiples_of(3)
buzzes = FizzBuzzRule.say('Buzz').for_multiples_of(5)

fizzbuzz_generator = (f'{fizz}{buzz}' or n
                      for n, fizz, buzz
                      in zip(numbers, fizzes, buzzes))


if __name__ == '__main__':
  for word in itertools.islice(fizzbuzz_generator, 30):
    print(word)

$ python fizzbuzz.py
1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16
17
Fizz
19
Buzz
Fizz
22
23
Fizz
Buzz
26
Fizz
28
29
FizzBuzz

Lazy FizzBuzz

QUANON — Thu, 16 Nov 2017 13:39:10 +0000

I though up this Fizz Buzz suddenly when I was about to go to the bathroom. So I made this note 😇

def genarate_lazy_list(number, yell)
  [*Array.new(number - 1, nil), yell].cycle
end

numbers = 1.step.lazy
fizzes = genarate_lazy_list(3,'Fizz')
buzzes = genarate_lazy_list(5,'Buzz')
fizzbuzzes = genarate_lazy_list(15,'FizzBuzz')

# Add backslash for irb. I prefer leading dots to trailing ones.
numbers \
  .zip(fizzes, buzzes, fizzbuzzes) \
  .map { |n, fizz, buzz, fizzbuzz| fizzbuzz || buzz || fizz || n } \
  .take(30) \
  .each(&method(:puts))

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16
17
Fizz
19
Buzz
Fizz
22
23
Fizz
Buzz
26
Fizz
28
29
FizzBuzz

My best Python heredoc like Ruby's one

QUANON — Thu, 16 Nov 2017 04:36:45 +0000

Ruby (I want to do like this with Python)

sayaka = '美樹 さやか'
kyoko = '佐倉 杏子'

str = <<~HEREDOC
  <div>
    <ul>
      <li>#{sayaka}</li>
      <li>#{kyoko}</li>
    </ul>
  </div>
HEREDOC

puts(str)

<div>
  <ul>
    <li>美樹 さやか</li>
    <li>佐倉 杏子</li>
  </ul>
</div>

Like above, I want to do:

Ignore leading whitespaces at each line
Ignore break line after the first '''

Python (How to do that)

def heredoc(str):
  from textwrap import dedent

  return dedent(str).strip()


if __name__ == '__main__':
  sayaka = '美樹 さやか'
  kyoko = '佐倉 杏子'

  str = heredoc(f'''
    <div>
      <ul>
        <li>{sayaka}</li>
        <li>{kyoko}</li>
      </ul>
    </div>
  ''')

  print(str)

<div>
  <ul>
    <li>美樹 さやか</li>
    <li>佐倉 杏子</li>
  </ul>
</div>