domodomodomo

"""Make a random username for Django, such as 'adf1-2dfa-dfc4-fa9a'."""
import random
import string
from django.contrib.auth import get_user_model


AuthUser = get_user_model()


def make_random_username(length=16,

domodomodomo

import timeit


def sample_code():
    lst, v = [1, 5, 3, 4, 5, 6, 7, 5, 5, 10], 5
    remove_equal(lst, v)
    print(lst, v)  # [1, 3, 4, 6, 7, 10] 5


def remove_equal_listcomprehension(lst: list, v):

domodomodomo

from abc import ABCMeta, abstractmethod


class Len(metaclass=ABCMeta):
    @abstractmethod
    def len(self):
        """Return length of object."""
        raise NotImplementedError()

    def checktype(method):

domodomodomo

def classmethod(method):
    def decorated_method(self, *args, **kwargs):
        cls = type(self)
        return method(cls, *args, **kwargs)
    return decorated_method


def staticmethod(method):
    def decorated_method(self, *args, **kwargs):
        # self を省略してメソッドを呼び出す。

domodomodomo

"""Show object's identity recursively.

sample code 1 ... difference between copy and deepcopy
sample code 2 ... reason why [[0]*3]*3 is not good for 2d list initialization
"""


def ids(identifier: object) -> dict:
    """Return the “identity” of an object, recursively."""
    # Effective Python item 26

domodomodomo

def usage():
    n = 2**2 * 3**2 * 5**2
    print('# n')
    print(n)
    print('## factorize')
    print(factorize(n))
    print('## divisor')
    for d in divisorize((factorize(n))):
        print(d, num(d))

domodomodomo

"""Emulating Object Oriented Programming with dict and function.

### 0. reference
1) This code was written by refering below content.
   Python のクラスシステム - http://www.shido.info/py/python7.html

### 1. emulating 3 concepts, class, instance and method.
1) class           -> dict
2) instance        -> dict
3) method          -> function

domodomodomo

"""
# 概要

    immutable なオブジェクトを生成するメタクラス Immutable

    属性参照は速いけど
    namedtuple:      0.07781907100070384
    自作したクラス:  0.04243788100029633

    インスタンス化は遅い

domodomodomo

import collections


def sample():
    # point 1. 属性はデコレータに文字列で与える。
    @immutable(
        'x1', 'y1', 'x2', 'y2',
        'is_rectangle', 'is_line', 'is_dot')
    class Region(object):
        # point 2. __init__ ではなく、__new__ を使う。

domodomodomo

"""Compare two list."""


def equal_list(lst1, lst2):
    lst1 = lst1.copy()
    for element in lst2:
        try:
            lst1.remove(element)
        except ValueError:
            return False