Here’s a structured documentation to create and schedule tasks and flows in Prefect based on your setup and examples.

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Prefect Installation and Environment Setup

Create Python Virtual Environment & Install Prefect

1. Create Python Virtual Environment:

   python3 -m venv prefect_env1

2. Activate the Virtual Environment:

   • Windows:

     .\prefect_env1\Scripts\activate

   • macOS/Linux:

     source prefect_env1/bin/activate

3. Install Prefect:

   pip install prefect

4. Check Prefect Version:

   prefect --version

5. Log In/Log Out of Prefect Cloud (if needed):

   prefect cloud logout
   prefect cloud login

6. Start Prefect Server (Local):

   prefect server start

7. Set Prefect API URL:

   prefect config set PREFECT_API_URL=http://127.0.0.1:4200/api

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1. Creating a Simple Prefect Task

In Prefect, a task is a basic unit of work, often used to perform a specific operation or function.

Example Task: say_hello

from prefect import task

@task
def say_hello(name: str):
    print(f"Hello, {name}!")

• Explanation: This task takes a name parameter and prints a greeting message.
• Usage: Define multiple tasks as needed to perform individual operations within a flow.

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2. Creating a Simple Prefect Flow

A flow is a collection of tasks, defining the sequence in which the tasks should be executed.

Example Flow: hello_goodbye_flow

from prefect import flow

@flow
def hello_goodbye_flow(name: str):
    say_hello(name)
    say_goodbye(name)

• Explanation: This flow is defined to call both say_hello and say_goodbye tasks sequentially, greeting and then saying goodbye to the name provided.

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3. Creating and Scheduling a Parameterized Prefect Flow

To allow flexibility in your workflows, you can parameterize your flows by adding arguments that can be set at runtime.

Example: Parameterized Flow

from prefect import flow, task

@task
def say_hello(name: str):
    print(f"Hello, {name}!")

@task
def say_goodbye(name: str):
    print(f"Goodbye, {name}!")

@flow
def hello_goodbye_flow(name: str):
    say_hello(name)
    say_goodbye(name)

• Usage: You can invoke hello_goodbye_flow with a specific name:

  hello_goodbye_flow(name="Jitendra")

Scheduling the Parameterized Flow

Use the deployment setup with an interval to schedule flows.

if __name__ == "__main__":
    hello_goodbye_flow.serve(
        name="Demo Deployment",
        tags=["Demo"],
        parameters={"name": "Jitendra"},
        interval=60  # runs every 60 seconds
    )

• Explanation: interval=60 schedules the flow to run every 60 seconds.

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4. Automating and Scheduling a Prefect Flow

With Prefect, flows can be set up for periodic or event-based automation by configuring schedules. In this example, the flow is automated to run every 60 seconds as demonstrated above.