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Day 1s meanderins
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‎days/04-06-collections/Day1.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Another good resource:\n",
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"\n",
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"https://howchoo.com/g/mtbhy2qzota/python-collections\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 28,
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"metadata": {},
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"outputs": [],
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"source": [
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"from collections import namedtuple, defaultdict"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"User = namedtuple('user','name job age')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 14,
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"metadata": {},
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"outputs": [],
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"source": [
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"user = User(name = 'Bill',job = 'Dad',age = 36)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 19,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'Bill'"
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]
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},
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"execution_count": 19,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"user.name"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 18,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'Bill is a Dad'"
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]
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},
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"execution_count": 18,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"f'{user.name} is a {user.job}'"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 35,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[('mike', 10),\n",
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" ('julian', 7),\n",
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" ('bob', 5),\n",
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" ('mike', 11),\n",
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" ('julian', 8),\n",
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" ('bob', 6),\n",
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" ('bill', 40)]"
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]
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},
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"execution_count": 35,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"challenges_done = [('mike', 10), ('julian', 7), ('bob', 5),\n",
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" ('mike', 11), ('julian', 8), ('bob', 6),\n",
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" ('bill', 40)\n",
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" ]\n",
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"challenges_done"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"mike 10\n",
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"julian 7\n",
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"bob 5\n",
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"mike 11\n",
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"julian 8\n",
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"bob 6\n"
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]
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}
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],
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"source": [
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"for name, challenge in challenges_done:\n",
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" print(name, challenge)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 73,
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"metadata": {},
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"outputs": [],
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"source": [
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"challenges_to_do = [('bill',10),('rachel',10),('bill',23)]\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 75,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"defaultdict(int, {'bill': 33, 'rachel': 10})"
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]
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},
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"execution_count": 75,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"challenges = defaultdict(int)\n",
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"for name, challenge in challenges_to_do:\n",
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" challenges[name] += challenge\n",
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"\n",
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"challenges"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 25,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"1\n",
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"1\n"
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]
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}
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],
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"source": [
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"for name, challenge, i in challenges_to_do:\n",
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" print(i)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 26,
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"metadata": {},
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"outputs": [
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{
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"ename": "KeyError",
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"evalue": "'mike'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mKeyError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-26-9f3e2914c8dc>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0mchallenges\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m{\u001b[0m\u001b[0;34m}\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;32mfor\u001b[0m \u001b[0mname\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mchallenge\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mchallenges_done\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mchallenges\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mname\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mchallenge\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mKeyError\u001b[0m: 'mike'"
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]
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}
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],
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"source": [
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"# Building up a dictionary is impossible(?) because the key doesn't exist - or you need to do the if statement\n",
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"\n",
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"challenges = {}\n",
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"for name, challenge in challenges_done:\n",
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" challenges[name].append(challenge)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Can do it pretty easily with a defaultdict"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 56,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"defaultdict(list,\n",
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" {'mike': [10, 11], 'julian': [7, 8], 'bob': [5, 6], 'bill': [40]})"
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]
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},
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"execution_count": 56,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"challenges = defaultdict(list)\n",
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"for name, challenge in challenges_done:\n",
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" challenges[name].append(challenge)\n",
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"\n",
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"challenges"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 34,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"mike 10\n",
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"julian 7\n",
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"bob 5\n"
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]
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}
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],
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"source": [
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"for k,v in challenges.items():\n",
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" print(k,v[0])"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 39,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"defaultdict(int, {})"
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]
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},
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"execution_count": 39,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"challenges_to_do"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 70,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"0\n"
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]
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}
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],
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"source": [
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"someddict = defaultdict(int)\n",
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"print(someddict[3])"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 71,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"defaultdict(<class 'int'>, {3: 0})\n"
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]
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}
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],
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"source": [
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"print(someddict)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.6.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

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