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Ken Takagiwa giwa

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@giwa
giwa / file0.txt
Created April 13, 2016 12:52
EP 25 Initialize Parent Classes with `super` ref: http://qiita.com/giwa/items/1e8bc71050a2490ce95c
from pprint import pprint
class MyBaseClass:
def __init__(self, value):
self.value = value
class TimesTwo:
def __init__(self):
self.value *= 2
@giwa
giwa / file0.txt
Last active April 13, 2016 13:05
EP 24 Use `@classmethod` Polymorphism to Construct Objects Generically ref: http://qiita.com/giwa/items/fd563a93825714cffd70
import os
from threading import Thread
class InputData:
def read(self):
raise NotImplementedError
class PathInputData(InputData):
def __init__(self, path):
super().__init__()
@giwa
giwa / file0.txt
Created March 15, 2016 16:22
EP 21 Enforce Clarity with Keyword-Only Arguments ref: http://qiita.com/giwa/items/7b04ce6f7262c2003321
def safe_division(number, divisor, ignore_overflow, ignore_zero_division):
try:
return number / divisor
except OverflowError:
if ignore_overflow:
return 0
else:
raise
except ZeroDivisionError:
if ignore_zero_division:
@giwa
giwa / file0.txt
Created March 13, 2016 05:53
EP19 Provide Optional Behavior with Keyword Arguments ref: http://qiita.com/giwa/items/c08c03452bb78fb916f8
def remidner(number, divisor):
return number % divisor
@giwa
giwa / file0.txt
Created March 11, 2016 14:50
EP 17 Be Defensive When Iterating Over Arguments ref: http://qiita.com/giwa/items/3c386c906472c7d54f24
def normalize(numbers):
total = sum(numbers)
result = []
for value in numbers:
percent = 100 * value / total
result.append(percent)
return result
@giwa
giwa / file0.txt
Last active March 11, 2016 19:24
Sum from 1 to 10 ref: http://qiita.com/giwa/items/6b88b2c579398bc2fa55
>>> sum(range(11))
55
>>> sum([i for i in range(1,11)])
55
>>> sum(i for i in range(1,11))
55
>>> import functools
>>> from functools import reduce
>>> reduce(lambda x,y: x + y, range(1,11))
55
@giwa
giwa / file0.txt
Created March 7, 2016 05:45
EP 16 Consider Generator Instead of Returning Lists ref: http://qiita.com/giwa/items/e20a575a0b3e6028d532
def index_words(text):
result = []
if text:
result.append(0)
for index, letter in enumerate(text):
if letter == ' ':
result.append(index + 1)
return result
@giwa
giwa / file0.txt
Created March 7, 2016 04:54
EP 15 Know How Closures Interact with Variable Scope ref: http://qiita.com/giwa/items/ef67c710fd007039c48a
def sort_priority(values, group):
def helper(x):
if x in group:
return (0, x)
return (1, x)
values.sort(key=helper)
@giwa
giwa / file0.txt
Created March 6, 2016 13:44
EP 14 Prefer Exceptions to Returning `None` ref: http://qiita.com/giwa/items/5ba9386970bcbccd0b80
def divide(a, b):
try:
return a/b
except ZeroDivisionError:
return None
@giwa
giwa / file0.txt
Last active February 18, 2016 04:26
ER 6 Know How Ruby Build Inheritance Hierarachies ref: http://qiita.com/giwa/items/2390a3f93a9e8c474707
BasicObject
<- Kernel (module)
<- PP::ObjectMixin(module)
<- Object
<- Person
<- Customer