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Luke Hoban
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Add virtualenv option to Python examples (#885)
Use the automatically managed `virtualenv: venv` support in all Python examples. See https://www.pulumi.com/docs/intro/languages/python/#virtual-environments. Also update the READMEs to no longer mention needing to manually create the virtual environment. The Pulumi CLI, as of v2.15.1, will automatically create & install dependencies in a virtual environment if the `virtualenv` runtime option is set in `Pulumi.yaml` and the configured directory is empty or doesn't exist.
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‎aws-django-voting-app/Pulumi.yaml

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name: voting-app
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runtime: python
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runtime:
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name: python
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options:
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virtualenv: venv
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description: Voting app that uses containers
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template:
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config:

‎aws-django-voting-app/README.md

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$ pulumi config set django-secret-key <VALUE> --secret
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```
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1. Create a Python virtualenv, activate it, and install dependencies:
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This installs the dependent packages [needed](https://www.pulumi.com/docs/intro/concepts/how-pulumi-works/) for our Pulumi program.
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```bash
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$ python3 -m venv venv
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$ source venv/bin/activate
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$ pip3 install -r requirements.txt
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```
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1. Run `pulumi up -y` to deploy changes:
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```bash

‎aws-py-appsync/Pulumi.yaml

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name: aws-py-appsync
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runtime: python
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runtime:
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name: python
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options:
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virtualenv: venv
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description: Basic example of defining an AWS AppSync endpoint from Pulumi in Python
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template:
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config:

‎aws-py-appsync/README.md

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$ pulumi config set aws:region us-east-2
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```
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1. Create a Python virtualenv, activate it, and install dependencies:
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This installs the dependent packages [needed](https://www.pulumi.com/docs/intro/concepts/how-pulumi-works/) for our Pulumi program.
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```bash
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$ python3 -m venv venv
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$ source venv/bin/activate
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$ pip3 install -r requirements.txt
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```
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1. Run `pulumi up` to preview and deploy changes:
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```bash

‎aws-py-assume-role/README.md

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You'll need to set the `create-role:unprivilegedUsername` configuration variable to the name of the unprivilged user, as
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well as the AWS region in which to operate.
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First, you need install dependencies. In this example we will install them in
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a virtual environment named `venv`.
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First, you need to create a new stack:
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```bash
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$ cd create-role
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$ python3 -m venv venv
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$ source venv/bin/activate
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$ pip install -r requirements.txt
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```
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Now create a new stack:
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```bash
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$ pulumi stack init assume-role-create
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$ pulumi config set create-role:unprivilegedUsername [email protected]
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$ pulumi config set aws:region us-east-1
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directory, replacing `{YOUR_STACK_PATH/assume-role-create}` with the full name of your stack from Part 1. Full name of your stack is available at [`app.pulumi.com`][app]
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```bash
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$ cd assume-role
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$ npm install
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$ cd ../assume-role
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$ export AWS_ACCESS_KEY_ID="$(pulumi stack output --stack {YOUR_STACK_PATH/assume-role-create} accessKeyId)"
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$ export AWS_SECRET_ACCESS_KEY="$(pulumi stack output --stack {YOUR_STACK_PATH/assume-role-create} --show-secrets secretAccessKey)"
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```

‎aws-py-assume-role/assume-role/Pulumi.yaml

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name: assume-role
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runtime: python
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runtime:
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name: python
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options:
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virtualenv: venv
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description: Demonstrate use of AWS AssumeRole Functionality

‎aws-py-assume-role/create-role/Pulumi.yaml

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name: create-role
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runtime: python
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runtime:
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name: python
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options:
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virtualenv: venv
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description: Demonstrate use of AWS AssumeRole Functionality

‎aws-py-dynamicresource/README.md

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$ pulumi config set sql-user-password <PASSWORD> --secret
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```
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1. Create a Python virtualenv, activate it, and install dependencies:
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This installs the dependent packages [needed](https://www.pulumi.com/docs/intro/concepts/how-pulumi-works/) for our Pulumi program.
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```bash
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$ python3 -m venv venv
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$ source venv/bin/activate
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$ pip3 install -r requirements.txt
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```
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1. Run `pulumi up -y` to deploy changes:
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```bash

‎aws-py-ec2-provisioners/Pulumi.yaml

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name: aws-py-ec2-provisioners
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runtime: python
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runtime:
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name: python
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options:
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virtualenv: venv
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description: An example of manually configuring an AWS EC2 virtual machine

‎aws-py-ec2-provisioners/README.md

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First, create a stack, using `pulumi stack init`.
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Now, we need to ensure that our dependencies are installed:
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```
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$ python3 -m venv venv
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$ source venv/bin/activate
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$ pip3 install -r requirements.txt
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```
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Next, generate an OpenSSH keypair for use with your server - as per the AWS [Requirements][1]
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```

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