generate pdf and rename folder
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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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"# The smell of classes"
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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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"## The \"data bundle\" smell"
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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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"ExecuteTime": {
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"end_time": "2021-08-11T12:50:34.342224Z",
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"start_time": "2021-08-11T14:50:34.336560+02:00"
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}
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},
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"outputs": [],
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"source": [
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"def momentum(mass, velocity):\n",
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" return mass * velocity\n",
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"\n",
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"def energy(mass, velocity):\n",
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" return 0.5 * mass * velocity ** 2\n",
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"\n",
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"def update_position(velocity, position, dt):\n",
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" return position + velocity * dt"
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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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"ExecuteTime": {
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"end_time": "2021-08-11T12:50:34.776689Z",
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"start_time": "2021-08-11T14:50:34.769617+02:00"
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}
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},
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"outputs": [],
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"source": [
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"# Naive\n",
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"mass1 = 10.0\n",
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"velocity1 = 0.9\n",
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"\n",
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"mass2 = 12.0\n",
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"velocity2 = 0.1\n",
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"\n",
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"print(momentum(mass1, velocity1))\n",
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"print(momentum(mass2, velocity2))"
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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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"We have two parameters that will be sent to these functions over and over again: `mass` and `velocity`.\n",
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"\n",
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"Moreover, the parameters cannot be mixed up (e.g. the velocity of one particle with the mass of another)."
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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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"ExecuteTime": {
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"end_time": "2018-07-27T15:05:52.548364Z",
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"start_time": "2018-07-27T17:05:52.544726+02:00"
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}
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},
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"outputs": [],
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"source": []
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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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"## Introducing classes as a data bundle template"
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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": 1,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2018-08-04T13:04:49.208543Z",
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"start_time": "2018-08-04T15:04:49.203180+02:00"
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}
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},
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"outputs": [],
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"source": [
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"class Particle:\n",
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" pass\n",
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"\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": 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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"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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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Class methods"
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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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"ExecuteTime": {
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"end_time": "2018-07-27T12:13:56.972938Z",
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"start_time": "2018-07-27T14:13:56.969323+02:00"
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}
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},
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"outputs": [],
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"source": [
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"def momentum(particle):\n",
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" return particle.mass * particle.velocity\n",
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"\n",
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"print(momentum(particle1))\n",
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"print(momentum(particle2))"
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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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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [],
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"source": [
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"class Particle:\n",
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" def __init__(self, mass, velocity):\n",
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" self.mass = mass\n",
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" self.velocity = velocity\n",
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"\n",
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" # Method here\n",
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"\n",
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"particle1 = Particle(10.0, 0.9, 0.0)\n",
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"print(particle1.momentum())"
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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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"cell_type": "markdown",
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"metadata": {
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"pycharm": {
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"name": "#%% md\n"
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}
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},
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"source": [
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"We have been using class instances and methods all along..."
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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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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [],
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"source": [
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"s = 'A scanner Darkly'\n",
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"s.capitalize()"
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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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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [],
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"source": [
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"x = set(['apple', 'banana', 'apple', 'pineapple'])\n",
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"x"
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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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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [],
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"source": [
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"x.union(['banana', 'kiwi'])"
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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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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [],
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"source": [
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"\n"
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]
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}
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],
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"metadata": {
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"hide_input": false,
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"kernelspec": {
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"display_name": "Python 3 (ipykernel)",
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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": "3.11.3"
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},
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"toc": {
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"nav_menu": {
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"height": "174px",
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"width": "252px"
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},
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"navigate_menu": true,
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"number_sections": true,
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"sideBar": true,
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"threshold": 4,
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"toc_cell": false,
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"toc_position": {
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"height": "953px",
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"left": "0px",
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"right": "1253px",
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"top": "127px",
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"width": "320px"
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},
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"toc_section_display": "block",
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"toc_window_display": false
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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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