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Chapter 32
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‎assets/book/learn_python_with_jupyter.pdf

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‎assets/notebooks/32_modules.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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"# 32. How can I reuse functions?\n",
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"\n",
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"## Working with Jupyter Notebooks and Python Modules\n",
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"\n",
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"[Learn Python with Jupyter](https://learnpythonwithjupyter.com/) by [Serena Bonaretti](https://sbonaretti.github.io/) \n",
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"Narrative license: [CC BY-NC-SA](https://creativecommons.org/licenses/by-nc-sa/2.0/). Code license: [GNU-GPL v3](https://www.gnu.org/licenses/gpl-3.0.en.html) \n",
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"\n",
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"---"
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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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"## 1. Creating a module\n",
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"\n",
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"- Learn the steps in Chapter 32!"
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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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"---\n",
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"## 2. Importing a module and running a function\n",
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" \n",
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"- Import the module as is, then call the function:"
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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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"import setup_database\n",
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"\n",
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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Import a module and create an alias, then call the function:"
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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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"import setup_database as sdb \n",
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"\n",
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"username = sdb.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Import one single function from a module, then call the function: "
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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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"from setup_database import create_username \n",
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"\n",
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"username = create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Import the function from a module and create an alias, then call the function: "
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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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"from setup_database import create_username as cu\n",
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"\n",
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"username = cu (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"---\n",
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"## 3. Importing a module from a different folder \n",
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"- Restart the kernel, then add the module folder and import the module:"
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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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"import sys\n",
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"sys.path.append(\"\") # write the module location in between quotes\n",
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"import setup_database"
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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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"- Call the function:"
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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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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"---\n",
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"## 4. Changing a function in a module and calling it in a Notebook"
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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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"- Restart the kernel, then call the function *before* the change:"
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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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"import setup_database\n",
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"\n",
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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Call the function *after* the change:"
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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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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Restart the kernel, then run autoreload:"
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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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"%load_ext autoreload\n",
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"%autoreload 2"
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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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"- Call the function *before* the change:"
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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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"import setup_database\n",
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"\n",
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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"- Call the function *after* the change:"
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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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"username = setup_database.create_username (\"John\", \"Gelb\") \n",
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"print (username)"
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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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"--- \n",
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"## 5. Adding functions to a module "
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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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"- Call `create_password()`:"
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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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"password = setup_database.create_password()\n",
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"print (password)"
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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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"- Call `create_database()`:"
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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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"customers = [[\"Maria\", \"Lopez\"], [\"Julia\", \"Smith\"], [\"Mohammed\", \"Seid\"]] \n",
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"db, n = setup_database.create_database(customers)\n",
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"print (\"Database:\", db)\n",
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"print (\"Number of customers:\", n) "
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]
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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 (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": "3.9.6"
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},
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"widgets": {
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"application/vnd.jupyter.widget-state+json": {
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"state": {},
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"version_major": 2,
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"version_minor": 0
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}
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}

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