write: pg.614

CavalcanteLucas · Jun 16, 2022 · 4ec8690 · 4ec8690
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diff --git a/.gitignore b/.gitignore
@@ -3,3 +3,4 @@ venv/
 *.swp
 .vscode/
 .ipynb_checkpoints/
+__pycache__/
diff --git a/Fluent_Python_2E.pdf → Fluent_Python.pdf b/Fluent_Python_2E.pdf → Fluent_Python.pdf
diff --git a/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/data/osconfeed.json b/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/data/osconfeed.json
diff --git a/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_2__osconfeed.py b/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_2__osconfeed.py
@@ -0,0 +1,18 @@
+from urllib.request import urlopen
+import warnings
+import os
+import json
+
+URL = 'http://www.oreilly.com/pub/sc/osconfeed'
+JSON = 'data/osconfeed.json'  # reference: https://github.com/fluentpython/example-code-2e/blob/master/22-dyn-attr-prop/oscon/data/osconfeed.json
+
+
+def load():
+    if not os.path.exists(JSON):
+        msg = 'downloading {} to {}'.format(URL, JSON)
+        warnings.warn(msg)
+        with urlopen(URL) as remote, open(JSON, 'wb') as local:
+            local.write(remote.read())
+
+    with open(JSON) as fp:
+        return json.load(fp)
diff --git a/...aprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_3__osconfeed_doctests.ipynb b/...aprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_3__osconfeed_doctests.ipynb
@@ -0,0 +1,160 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['conferences', 'events', 'speakers', 'venues']"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "from ex_19_2__osconfeed import load\n",
+    "\n",
+    "feed = load()\n",
+    "sorted(feed['Schedule'].keys())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "  1 conferences\n",
+      "484 events\n",
+      "357 speakers\n",
+      " 53 venues\n"
+     ]
+    }
+   ],
+   "source": [
+    "for key, value in sorted(feed['Schedule'].items()):\n",
+    "    print('{:3} {}'.format(len(value), key))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'Carina C. Zona'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "feed['Schedule']['speakers'][-1]['name']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "141590"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "feed['Schedule']['speakers'][-1]['serial']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'There *Will* Be Bugs'"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "feed['Schedule']['events'][40]['name']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[3471, 5199]"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "feed['Schedule']['events'][40]['speakers']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "interpreter": {
+   "hash": "b1cad6e4136aaf5b8d341537b41e4e06441496f7176c964558b716a0d04682ee"
+  },
+  "kernelspec": {
+   "display_name": "Python 3.10.2 64-bit ('python-fluent')",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.2"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/..._6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_4__frozen_json.ipynb b/..._6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_4__frozen_json.ipynb
@@ -0,0 +1,184 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "357"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "from ex_19_2__osconfeed import load\n",
+    "from ex_19_5__frozen_json import FrozenJSON\n",
+    "\n",
+    "raw_feed = load()\n",
+    "feed = FrozenJSON(raw_feed)\n",
+    "len(feed.Schedule.speakers)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['conferences', 'events', 'speakers', 'venues']"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sorted(feed.Schedule.keys())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'Carina C. Zona'"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "feed.Schedule.speakers[-1].name"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "ex_19_5__frozen_json.FrozenJSON"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "talk = feed.Schedule.events[40]\n",
+    "type(talk)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'There *Will* Be Bugs'"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "talk.name"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[3471, 5199]"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "talk.speakers"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "KeyError",
+     "evalue": "'flavor'",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
+      "\u001b[1;32m/home/lucas/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_4__frozen_json.ipynb Cell 7'\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> <a href='vscode-notebook-cell:/home/lucas/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_4__frozen_json.ipynb#ch0000006?line=0'>1</a>\u001b[0m talk\u001b[39m.\u001b[39;49mflavor\n",
+      "File \u001b[0;32m~/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py:15\u001b[0m, in \u001b[0;36mFrozenJSON.__getattr__\u001b[0;34m(self, name)\u001b[0m\n\u001b[1;32m     <a href='file:///home/lucas/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py?line=12'>13</a>\u001b[0m     \u001b[39mreturn\u001b[39;00m \u001b[39mgetattr\u001b[39m(\u001b[39mself\u001b[39m\u001b[39m.\u001b[39m__data, name)\n\u001b[1;32m     <a href='file:///home/lucas/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py?line=13'>14</a>\u001b[0m \u001b[39melse\u001b[39;00m:\n\u001b[0;32m---> <a href='file:///home/lucas/codes/python-fluent/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py?line=14'>15</a>\u001b[0m     \u001b[39mreturn\u001b[39;00m FrozenJSON\u001b[39m.\u001b[39mbuild(\u001b[39mself\u001b[39;49m\u001b[39m.\u001b[39;49m__data[name])\n",
+      "\u001b[0;31mKeyError\u001b[0m: 'flavor'"
+     ]
+    }
+   ],
+   "source": [
+    "talk.flavor"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "interpreter": {
+   "hash": "b1cad6e4136aaf5b8d341537b41e4e06441496f7176c964558b716a0d04682ee"
+  },
+  "kernelspec": {
+   "display_name": "Python 3.10.2 64-bit ('python-fluent')",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.2"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py b/Part_6__Metaprogramming/Chap_19__Dynamic_Attributes_and_Properties/ex_19_5__frozen_json.py
@@ -0,0 +1,25 @@
+from collections import abc
+
+
+class FrozenJSON:
+    """A read-only facade for navigating a JSON-like object
+    using attribute notation
+    """
+
+    def __init__(self, mapping):
+        self.__data = dict(mapping)
+
+    def __getattr__(self, name):
+        if hasattr(self.__data, name):
+            return getattr(self.__data, name)
+        else:
+            return FrozenJSON.build(self.__data[name])
+
+    @classmethod
+    def build(cls, obj):
+        if isinstance(obj, abc.Mapping):
+            return cls(obj)
+        elif isinstance(obj, abc.MutableSequence):
+            return [cls.build(item) for item in obj]
+        else:
+            return obj
diff --git a/current_pg.log b/current_pg.log
@@ -1,2 +1 @@
 read - 320
-write - 404