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In the scope of "Gang of Four" book patterns split up on three categories by their purpose: creational, structural, and behavioral. And also pattens split up by criterion, called scope, specifies whether the pattern applies primarily to classes or to objects.

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Class patterns deal with relationships between classes and their subclasses. These 
relationships are established through inheritance, so they are static—
fixed at compile-time. Object patterns deal with object relationships, which can be

changed at run-time and are more dynamic. Almost all patterns use inheritance to some

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from datetime import datetime

from airflow.hooks.postgres_hook import PostgresHook
from airflow.operators.python_operator import PythonOperator
from airflow import DAG


with DAG(dag_id="postgres_check_table", start_date=datetime(2018, 10, 12)) as dag:

    def check_table_exist(sql_to_get_schema, sql_to_check_table_exist,

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# example for tox.ini with test mode for airflow turned on

[tox]
envlist = flake8, py27

[testenv]
basepython = python2.7

[testenv:flake8]
deps=

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""" import operators with 
from airflow.operators.postgres_custom import PostgreSQLCheckTable, PostgreSQLCountRows """ 

import logging

from airflow.models import BaseOperator
from airflow.plugins_manager import AirflowPlugin
from airflow.utils.decorators import apply_defaults
from airflow.hooks.postgres_hook import PostgresHook

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import timeit

i = [str(x) for x in range(1000000)]
def funct_write_with_print():
    with open('test1.txt', 'w') as fout:
        print(i, file=fout)


def write_with_write():
    with open('test12.txt', 'w') as fout:

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import multiprocessing as mp
from multiprocessing import Queue
from datetime import datetime
import sympy
start_time = datetime.now()

q = Queue()

def is_prime(left_border, right_border):
    result = 0

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class User(Base):

    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    fullname = Column(String)
    nickname = Column(String)

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class User(Base):
    
    id: int
    name: str
    fullname: str
    nickname: str

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class MySuperMeta(type):
    def __call__(cls, *args, **kwargs):
        print(f'Do you need an instance of {cls}?')
        return super(MySuperMeta, cls).__call__(*args, **kwargs)
      
class A(metaclass=MySuperMeta):
    pass

a = A()

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FROM python:3.7.7 as base
RUN pip install poetry==1.0.5
WORKDIR /app
# hack to avoid reinstall dependencies each time when source code of gino_admin changed
# without it poetry will say error what there is no package gino_admin
RUN  mkdir /app/gino_admin && touch /app/gino_admin/__init__.py
COPY pyproject.toml poetry.lock README.rst /app/

RUN poetry config virtualenvs.create false \
  && poetry install --no-interaction --no-ansi