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Publish Ch 30
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‎assets/book/learn_python_with_jupyter.pdf

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‎assets/notebooks/29_function_outputs.ipynb

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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 29. Usernames and passwords\n",
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"# 29. Login database for an online store\n",
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"\n",
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"## Function outputs and modular design\n",
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"\n",
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"metadata": {},
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"source": [
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"- You are the owner of an online shop and need to securely store usernames and passwords of your\n",
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"customers. Create a database where usernames are composed of the initial of the customer’s first\n",
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"name followed by their last name, and passwords consist of a four-digit code"
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"customers. Create a database where usernames are composed of the initial of the customer’s first name followed by their last name (e.g., “jsmith”), and passwords consist of a four-digit code"
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]
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},
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{
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"outputs": [],
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"source": [
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"def create_username (first_name, last_name):\n",
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" \"\"\"Create a lowercase username made of initial of first name and last name\n",
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" \"\"\"Create a lowercase username made of initial of first name and full last name\n",
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" \n",
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" Parameters\n",
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" ----------\n",

‎assets/notebooks/30_function_io_extra.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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"# 30. Free ticket at the museum\n",
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"\n",
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"## Input validation and outputs variations\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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"- You work at a museum and have to update the online system to buy tickets. The update is that people who are 65 and older now qualify for a free ticket. Write a function that asks visitors to enter their prefix, last name, and age; checks the *types* and *values* of these inputs; and returns a message telling the visitor if they are eligible for a free ticket."
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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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"def free_museum_ticket(prefix, last_name, age): \n",
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" \"\"\"Returns a message containing inputs and free ticket eligibility based on age\n",
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" E.g. Mrs. Holmes, you are eligible for a free museum ticket because you are 66\n",
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" \n",
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" Parameters\n",
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" ----------\n",
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" prefix : string\n",
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" Ms, Mrs, Mr\n",
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" last_name : string\n",
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" Last name of a visitor\n",
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" age : integer\n",
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" Age of a visitor\n",
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" \n",
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" Returns\n",
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" -------\n",
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" string \n",
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" Message containing visitor inputs and eligibility\n",
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" \"\"\"\n",
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" \n",
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" # --- checking parameter types ---\n",
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" \n",
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" # the type of prefix must be string\n",
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" if not isinstance (prefix, str): \n",
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" raise TypeError (\"prefix must be a string\")\n",
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" \n",
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" # the type of last_name must be string\n",
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" if not isinstance (last_name, str): \n",
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" raise TypeError (\"last_name must be a string\")\n",
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" \n",
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" # the type of age must be integer\n",
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" if not isinstance (age, int): \n",
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" raise TypeError (\"age must be an integer\") \n",
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"\n",
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" \n",
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" # --- checking parameter values ---\n",
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" \n",
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" # prefix must be Ms, Mrs, or Mr\n",
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" if prefix not in [\"Ms\", \"Mrs\", \"Mr\"]:\n",
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" raise ValueError (\"prefix must be Ms, Mrs, or Mr\")\n",
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" \n",
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" # last_name must contain only characters \n",
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" if not last_name.isalpha():\n",
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" raise ValueError (\"last_name must contain only letters\")\n",
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" \n",
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" # age has to be between 0 and 125\n",
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" if age < 0 or age > 125:\n",
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" raise ValueError (\"age must be between 0 and 125\")\n",
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"\n",
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" \n",
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" # --- returning output ---\n",
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"\n",
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" if age >= 65:\n",
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" return prefix + \". \" + last_name + \", you are eligible for a free museum ticket because you are \" + str(age)\n",
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" else:\n",
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" return prefix + \". \" + last_name + \", you are not eligible for a free museum ticket because you are \" + str(age) "
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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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"- Call the function checking the parameter *types*:"
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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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"# checking prefix type\n",
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"message = free_museum_ticket(1, \"Holmes\", 66)\n",
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"print (message)"
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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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"# checking last_name type\n",
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"message = free_museum_ticket(\"Mrs\", 1.2, 66)\n",
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"print (message)"
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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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"# checking age type\n",
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"message = free_museum_ticket(\"Mrs\", \"Holmes\", \"Hi\") \n",
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"print (message)"
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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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"- Call the function checking parameter *values*:"
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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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"# checking prefix value\n",
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"message = free_museum_ticket(\"Dr\", \"Holmes\", 66)\n",
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"print (message)"
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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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"# checking last_name value\n",
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"message = free_museum_ticket(\"Mrs\", \"82\", 66)\n",
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"print (message)"
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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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"# checking age value\n",
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"message = free_museum_ticket(\"Mrs\", \"Holmes\", 130)\n",
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"print (message)"
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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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"- Call the function testing the two possible returns:"
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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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"# person is eligible\n",
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"message = free_museum_ticket(\"Mrs\", \"Holmes\", 66)\n",
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"print (message)"
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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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"# person is not eligible\n",
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"message = free_museum_ticket(\"Mrs\", \"Choi\", 38)\n",
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"print (message)"
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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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}

‎index.html

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<div class="col-lg-12">
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<span class="skill">BOOK COMPLETION <i class="val">78%</i></span>
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<span class="skill">BOOK COMPLETION <i class="val">80%</i></span>
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<div class="progress-bar-wrap">
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<div class="progress-bar" role="progressbar" aria-valuenow="78" aria-valuemin="0" aria-valuemax="100"></div>
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<div class="progress-bar" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100"></div>
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</div>
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</div>
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<center>Next upload: <b>Chapter 30</b> on <b>February 3</b> </center>
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<center>Next upload: <b>Chapter 31</b> on <b>March 3</b> </center>
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</div>
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</div>
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<h4>PART 8: Functions </h4>
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<ol start="28">
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<a href="assets/notebooks/28_function_inputs.ipynb" onclick="download" ><li>Printing Thank you cards<br> <i>Function inputs</i></li></a>
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<a href="assets/notebooks/29_function_outputs.ipynb" onclick="download" ><li>Usernames and passwords<br> <i>Function outputs and modular design</i></li></a>
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<li>People's age and odd numbers<br> <i>Type and value errors, and return</i></li>
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<a href="assets/notebooks/29_function_outputs.ipynb" onclick="download" ><li>Login database for an online store<br> <i>Function outputs and modular design</i></li></a>
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<a href="assets/notebooks/30_function_io_extra.ipynb" onclick="download" ><li>Free ticket at the museum<br> <i>Input validation and output variations</i></li></a>
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<li>Factorials<br> <i>Recursive functions</i></li>
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<li>Jupyter notebooks and modules<br> <i>Working with Jupyter Notebook and an IDE</i></li>
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</ol>

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