---
title: "Install the Dependencies"
url: https://docs.catalyst.zoho.com/en/tutorials/leadmanager-appsail/flask/init-dependencies/
description: "Build a Lead Manager application and host it on AppSail. The app connects to your Zoho CRM account using Catalyst connectors, and enables you to view, create, update, or delete leads from the Leads module in your CRM."
last_updated: 2026-08-17T12:16:04Z
service: All Services
type: tutorial
related_links:
  - name: "Python SDK"
    url: /en/sdk/python/v1/overview/
---

# Install Flask and the Required Dependencies in a Virtual Environment

To employ this Python Flask app, we will need to create a virtual environment in your system. 

You can create a virtual environment by executing the following commands in your terminal.

**For Linux/Mac Users**

```sh
python3.10 -m venv myenv
```

```sh
source myenv/bin/activate
```

**For Windows Users**

```sh
python3.10 -m venv myenv
```

```sh
myenv\Scripts\activate
```

![catalyst_tutorials_leadmanager_appsail_python_virtual_env](https://catalyst-docs-development.zohostratus.in/images/tutorials/leadmanager-appsail/catalyst_tutorials_leadmanager_appsail_python_virtual_env.webp)

Now in the virtual environment you have just created, execute the following CLI command to install **Flask** and the required [Catalyst SDK](https://docs.catalyst.zoho.com/en/sdk/python/v1/overview/).

```sh
python3 -m pip install zcatalyst-sdk
```

![catalyst_tutorials_leadmanager_appsail_python_pip_install](https://catalyst-docs-development.zohostratus.in/images/tutorials/leadmanager-appsail/catalyst_tutorials_leadmanager_appsail_python_pip_install.webp)

> **Note:** You can find out more about Catalyst SDK for AppSail from this [help documentation](https://docs.catalyst.zoho.com/en/serverless/help/appsail/key-concepts/catalyst-configurations/#implementing-catalyst-sdk-in-appsail).

After you install the packages, your project directory will appear like this:
![catalyst_tutorials_leadmanager_appsail_dir_view_post_pip](https://catalyst-docs-development.zohostratus.in/images/tutorials/leadmanager-appsail/catalyst_tutorials_leadmanager_appsail_dir_view_post_pip.webp)

All the required packages for your Python Flask application have been installed.