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Homework #5 Google Cloud Platform (GCP) with Python
This semester we are allowing all students to explore cloud computing as offered by the Google Cloud Platform using Python. Using the instructions below, you can establish a service using Google App Engine. Once established, you will be able to move your Python program developed for Assignment #6 to your Google App Engine instance and have it executed there.
1. Sign up for Google Cloud Platform
If you do not have a credit card, Google provides you with a c

1.1 Get Google Cloud Platform Education Grants credit
On Piazza and by e-mail, you will receive a communication like the one displayed below. The communication contains information on how to request a Google Cloud Platform coupon. Click on the text Student Coupon Retrieval Link, or the link provided in the Piazza post.
Cloud Platform Education Grants program (see section 1.1). If you do have a credit
oupon code via the Google
card, you can sign up for the Google Cloud Platform “Free Trial” (see section 1.2).
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You will be redirected to a web form as shown below:
Enter your First Name, Last Name and your USC e-mail address. @usc.edu will be pre-filled. Click on Submit. If you entered a valid USC e-mail address, an email will be sent to that USC email address to verify that you own such address. A sample email is shown below:
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Notice that anyone with the URL from USC can request a coupon, so please be careful and do not share the Student Coupon Retrieval Link or the link to verify your email.
Once your USC email address is “verified”, you will receive a second email with a Google Cloud Platform Coupon Code, as shown below.
Important step: Before clicking on the link labeled [here], you should open your default browser, and login to a Gmail account. Every USC student has been provided with a Gmail account.
Once logged into Gmail, you can click on [here], or you can go to this page:
https://console.cloud.google.com/education
and paste the Coupon Code, to redeem your coupon. The web form below will be displayed.
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You need to paste your coupon into the field labeled Coupon code. Select Yes or No to receive announcements. Make sure that the active profile in the top right is the one associated with your Gmail account. Click on Accept and continue. You will now be taken to the Google Cloud Platform’s Home section. You can navigate to the Billing section and navigate to Account Management to see the amount of your credit, as shown below.
Important Note: if you have redeemed your coupon with your USC e-mail account, instead of your Gmail account, your coupon will not be usable, as the USC G Suite account does not allow the user to create GCP Projects. If you accidentally did this, you can apply the coupon to the correct billing account, by following the steps in this document:
http://csci571.com/hw/hw5/GCP_G_Suite_Workaround.pdf
If you were successful in signing up and obtaining the $50 CGP Education Credit, skip to section 1.3. How to get additional student Coupons.
1.2 Sign up for Google Cloud Platform Free Trial
IMPORTANT: you should follow the steps in this section, only of you were unable
to obtain the $50 coupon.
To sign up for the Free Trial, with an additional $300 credit, you need a credit card. Unfortunately, an American Express or other pre-paid Gift card will not work with Google Cloud.
To sign up go to:
https://console.cloud.google.com/freetrial?pli=1&page=0
In the Try Cloud Platform for free page, select Yes under “I have read and agree to the
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Google Cloud Platform Free Trial terms of Service” and click on Agree and continue.
Select Account type Individual. Follow the instructions to enter your account data. You should not be using your @usc.edu e-mail account for your primary contact e-mail address, but instead use your @gmail.com address and finish by clicking Start my free trial. You will have to provide a credit or debit card.
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After you are signed up, you will see the message “Creating project. This may take a few moments”.” You will then be redirected to the Dashboard of the Google Developer Console.
To confirm your credits, navigate to Billing > Account Management from the left navigation bar to see a credit value of $300 valid for 365 days or you can verify it as below.
If you previously developed any projects using Google APIs, you will find them listed.
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1.3. How to get additional student Coupons
If you follow our instructions to install Python (and late on Node.js) you will likely never incur charges that exceed the value of your coupons. But there are always students that want to play around and run services all over the place.
When a student exceeds 60% of the value of a coupon, Google sends a notification, by e-mail, to the instructor. The instructor can get additional coupons for the student by filling out the same form listed on page 2, using the instructor’s e-mail address that was used to obtain the grant. The instructor will receive the coupon and deliver it to the student by e-mail.
Google limits the additional coupons to 2 for each student account used in a given course.
2. Setting up a Python development environment
To set up a Python development environment for GCP to develop Python apps that run
on Google Cloud, you should follow the steps from this tutorial:
https://cloud.google.com/python/docs/setup
The tutorial covers all the following:
• Install the latest version of Python.
• Use venv to isolate dependencies.
• Install an editor (optional).
• Install the Cloud SDK (optional).
• Install the Cloud Client Libraries for Python (optional).
• Install other useful tools.
2.1 Installing Python
The tutorial provides steps to install the latest version of Python 3 on macOS, Windows and Linux.
Note: As of 1/22/2022, App Engine on Google Cloud is compatible with Python 3.7, 3.8 and 3.9. Quoting from:
https://cloud.google.com/appengine/docs/standard/python3/runtime
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“The Python 3 runtime supports Python 3.7, Python 3.8, and Python 3.9, and it uses the latest stable release of the version that is specified in your app.yaml file.”
Installing on macOS
/usr/bin/env python -V
To avoid interfering with macOS, we recommend creating a separate development environment and installing the latest version of Python (version 3.7 or later). To install Python, use Homebrew, available at:
https://brew.sh/
After installing Homebrew, you can install the latest Python with:
brew install python
macOS includes a version of Python by default and uses it for its own purposes
(normally version 2.7.X). Verify your Mac’s Python installation using the following
As of this writing, Homebrew will install Python 3.9.2. If all is well, the installation will
complete, as shown below.
Normally Python 3 will be installed in /usr/local/bin/python3 (a symbolic link to another folder). If you have kept the default Python 2.7, you will have to add aliases to your startup files (for Bash and Zsh) for Python 3 and Pip 3 locations, run the following commands:
echo “alias python=/usr/local/bin/python3.7” >> ~/.zshrc echo “alias python=/usr/local/bin/python3.7” >> ~/.bashrc echo “alias pip=/usr/local/bin/pip3” >> ~/.zshrc
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echo “alias pip=/usr/local/bin/pip3” >> ~/.bashrc
If you are using bash and ~/.bash_profile, you may have to do this instead:
echo “alias python=/usr/local/bin/python3.7” >> ~/.bash_profile echo “alias pip=/usr/local/bin/pip3” >> ~/.bash_profile.
Replace python3.7 in the script above with your installed version, such as python3.9.
You will have to re-start Terminal, so the aliases will take effect. Start and new terminal session and verify Python 3 is available as python and python3, and that pip is also installed, by running the following commands:
python –version
pip –version
Note for macOS Big Sur. Big Sur also comes with only Python 2.7.16 installed. If you run:
% python –version
Python 2.7.16
And if you run:
% python3 –version
xcode-select: note: no developer tools were found at ‘/Applications/Xcode.app’.
requesting install. Choose an option in the dialog to download the command line developer tools.
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And a popup is displayed that asks you to download and install the “command line developer tools”. After the software is installed, you can run:
% python3 –-version
Python 3.9.2
Since Python 2 is still the default, you will have to do similar updates to your Bash and Zsh startup files, to default to Python 3, which slightly different paths.
Installing on Windows
echo “alias python=/usr/bin/python3.7” >> ~/.zshrc echo “alias python=/usr/bin/python3.7” >> ~/.bashrc echo “alias pip=/usr/bin/pip3” >> ~/.zshrc
echo “alias pip=/usr/bin/pip3” >> ~/.bashrc
Since Windows does not come with Python, download the installers for the latest
versions of Python from the Python website at:
https://www.python.org/downloads/windows/
as of this writing, we recommend you download Python 3.7.6, the same version that we recommend for macOS. Complete the installation by adding the proper PATH and verifying the version of Python 3 and pip installed, as outlined in the tutorial.
2.2 Use venv to isolate dependencies
venv is a tool that creates isolated Python environments. Use the venv command to create a virtual copy of the entire Python installation.
Follow the tutorial to do the following:
• Create a virtual copy in a folder named venv
• Set your shell to use the venv paths for Python by activating the virtual
environment
• Install packages without affecting other projects or your global Python
installation
• If you want to stop using the virtual environment and go back to your global
Python, you can deactivate it
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2.3 Installing a Python editor
There are several, popular editors for Python. In particular Sublime Text, Atom, Visual Studio Code, and PyCharm. We recommend that you use PyCharm, as it is free for students from JetBrains, and available at:
https://www.jetbrains.com/pycharm/
The free “educational” version of PyCharm can be downloaded here: https://www.jetbrains.com/education/download/#section=pycharm-edu
PyCharm is available for macOS, Windows and Linux.
Another good editor is Visual Studio Code by Microsoft. It can be downloaded here: https://code.visualstudio.com/
Visual Studio Code is available for macOS, Windows and Linux.
3. Creating a Project and Application using CLI
The Cloud SDK is a set of command-line tools for Google Cloud. It contains gcloud, and gsutil, which you can use to access App Engine, Compute Engine, Cloud Storage, and other products and services from the command line. The Cloud SDK is available at:
https://cloud.google.com/sdk/
The Cloud SDK is available for Linux, Ubuntu, CentOS, macOS and Windows.
Quickstarts for each platform are available here:
https://cloud.google.com/sdk/docs/quickstarts
1. The “Quickstart for Python 3 in the App Engine Standard Environment” page is available at:
https://cloud.google.com/appengine/docs/standard/python3/quickstart
2. The QuickStart tutorial provides all the steps needed to do all the following:
• Downloading and installing the Cloud SDK
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• Creating a new project
• Initialize App Engine app
• Enable billing for the project
• Downloading and installing Git
• Install the App Engine extension for Python 3
• Download the Hello World app written with Flask
• Run Hello World on your local machine
• Deploy and run Hello World on App Engine
• Clean-up to stop billing
3. Download and install the Google Cloud SDK “latest” version for your platform (Mac
OS, Windows) from:
https://cloud.google.com/sdk/docs/
While in most of the GCP docs it is documented that gcloud needs to run on Python 2, according to the Note in the above site “As of Cloud SDK version 274.0.0, the gcloud CLI has GA support for running using a Python 3.5 and up interpreter (run gcloud topic startup for exclusions and more information on configuring your Python interpreter).”
4. Under “Guides” click on Installing Google Cloud SDK.
5. Select the package for your OS platform, and extract the archive file on your local
file system.
6. (Optional) Add the Cloud SDK tools to your PATH. Run the script (from the root of the folder you extracted in the last step) using this command:
./google-cloud-sdk/install.sh
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7. Run a command to install the cloud component that includes the App Engine
extension for Python:
gcloud components install app-engine-python
8. Initialize the gcloud tool to initialize the SDK:
gcloud init
You will be asked to “log in (Y/n)?” Answer Y.
You will be asked to “Pick a current project” or “Create a new project”. Select “create” and when asked, enter a name as appropriate.
You will be asked to Choose an account and Allow access as shown below.
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Notice that Project IDs must start with a lowercase letter and can have lowercase ASCII letters, digits, or hyphens. Project IDs must be between 6 and 30 characters. For example:
myfirstpython-94534
9. Verify the project was created and see its details:
createTime: ‘2020-01-08T18:34:36.846Z’
lifecycleState: ACTIVE
name: myfirstpython-94534
projectId: myfirstpython-94534
projectNumber: ‘675437181434’
gcloud app create –project=[YOUR_PROJECT_ID]
gcloud projects describe myfirstpython-94534
For example, you’ll see something like this:
10.Initialize the App Engine app with your newly created project and choose its region
(for example us-west2):
for example:
gcloud app create –project=myfirstpython-94534
11.Enable billing for the project. You will do this in the Cloud console at:
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https://console.cloud.google.com/projectselector/billing?lang=python3
You will have to select the project and click Link a billing account.
Select the billing account you created with your Google credits.
12.Install Git
13.Clone the Google Cloud Platform Python Samples repository from Github:
https://github.com/GoogleCloudPlatform/python-docs-samples
14.Test the Hello World app on your local machine:
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a. WindowsONLY:downloadandinstallPowerShellasindicatedinthetutorial. b. CreateanisolatedPythonenvironment,inafolder“external”toyourproject.
python3 -m venv env
source env/bin/activate
(Note: run env/Scripts/activate in Windows)
c. Change to the directory that contains the Hello World sample code:
d. Ifthefilerequirements.txtdoesnotexists,createitwith:
pip freeze > requirements.txt
e. Installdependencies(thisstepwillinstallFlask):
pip install -r requirements.txt
f. Run the application:
python main.py
python-docs-samples/appengine/standard_python3/hello_world
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16.View your application in the cloud. Launch your browser with the app at http://[YOUR_PROJECT_ID].[REGION_ID].r.appspot.com,
running the command:
gcloud app browse
Or type the URL in the browser:
https://myfirstpython-94534.us-west2.r.appspot.com/ or
https://second-python-745309.wl.r.appspot.com/
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17.Clean up. First stop using the virtual environment. Type this to the (env) prompt:
deactivate
18. Toavoidincurringcharges,deleteyourCloudPlatformprojecttostopbillingon
all resources.
19. The “Hello World” program comes with a file named requirements.txt. This file needs to be deployed to GCP. Once you add your code and add some Python libraries, this file needs to be updated. Use pip to install your libraries locally. Then run the following pip command:
pip freeze > requirements.txt
This pip command will update the requirements.txt file with all the needed libraries. The local Python libraries should not be uploaded and deployed to CGP. Instead the libraries included in the deployed requirements.txt file will be automatically downloaded and installed by GCP. Every time you add a new library to your local copy, you need to run “pip freeze” before deploying to GCP.
4. Check App Engine Dashboard
Click on “triple bar” on top left of the GCP console. Select App Engine. Select your Project ID.
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5. Set up Exploring Your instance (Optional)
If you want to explore your server instance you can activate the Google Cloud Shell.
Go to the App Engine Dashboard. Select the Hello World project from the dropdown. Now click on the Activate Google Cloud Shell icon in the top toolbar (see picture above).
After waiting a few minutes for Google to establish the connection, you will see the shell appear at the bottom of the browser window. You can now use Linux commands to manage your Cloud Platform Console projects and resources.
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You can read more about the Google Cloud Shell here: https://cloud.google.com/cloud-shell/docs/
6. Monitoring your instance and you bill
Select Google Cloud Platform and go to the Dashboard. If you do not see a Billing “tile”, click CUSTOMIZE in the upper left toolbar. Turn on the billing tile “switch” and click DONE. Under Billing you will see if you are incurring any charges. Hou will likely see $0.00 estimated charges.
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