demos.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Coordinate:\n",
    "    '''Coordinate on Earth'''\n",
    "    \n",
    "    reference_system = 'WGS84'\n",
    "    \n",
    "    def __init__(self, lat, long):\n",
    "        self.lat = lat\n",
    "        self.long = long\n",
    "    \n",
    "    def __repr__(self):\n",
    "        return f'Coordinate({self.lat}, {self.long})'\n",
    "    \n",
    "    def __str__(self):\n",
    "        ns = 'NS'[self.lat < 0]\n",
    "        we = 'WE'[self.long < 0]\n",
    "        return f'{abs(self.lat):.1f}°{ns}, {abs(self.long):.1f}°{we}'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "c = Coordinate(26, 46)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Coordinate(26, 46)"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "c"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "26.0°N, 46.0°W\n"
     ]
    }
   ],
   "source": [
    "print(c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "CoordinateT(lat=22, long=44)"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from collections import namedtuple\n",
    "\n",
    "CoordinateT = namedtuple('CoordinateT', 'lat long')\n",
    "\n",
    "c = CoordinateT(22, 44)\n",
    "c"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "44"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "lat, long = c\n",
    "long"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "From [SQL Alquemy Object Relational Tutorial](https://docs.sqlalchemy.org/en/13/orm/tutorial.html):\n",
    "\n",
    "```python\n",
    "from sqlalchemy.ext.declarative import declarative_base\n",
    "from sqlalchemy import Column, Integer, String\n",
    "\n",
    "Base = declarative_base()\n",
    "\n",
    "class User(Base):\n",
    "    __tablename__ = 'users'\n",
    "\n",
    "    id = Column(Integer, primary_key=True)\n",
    "    name = Column(String)\n",
    "    fullname = Column(String)\n",
    "    nickname = Column(String)\n",
    "\n",
    "    def __repr__(self):\n",
    "       return \"<User(name='%s', fullname='%s', nickname='%s')>\" % (\n",
    "                            self.name, self.fullname, self.nickname)\n",
    "```\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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   "display_name": "Python 3",
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    "name": "ipython",
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