Telethon’s download_media Method Not Working in AWS Lambda

What will you learn?

In this tutorial, you will learn how to troubleshoot and resolve the issue of Telethon’s download_media method not working correctly within an AWS Lambda environment.

Introduction to the Problem and Solution

Encountering difficulties with Telethon’s download_media method in an AWS Lambda setup can be challenging. To overcome this obstacle, it is essential to understand the intricacies of running Python code in a serverless environment like AWS Lambda. By adjusting our approach and implementing workarounds tailored to this specific issue, we can successfully download media files using Telethon within the constraints of AWS Lambda.


# Import necessary libraries
from telethon.sync import TelegramClient

# Initialize your Telegram client with appropriate credentials
client = TelegramClient('session_name', api_id, api_hash)

# Define a function to download media using Telethon
def download_telegram_media(url):
    with client:
        # Fetch the media from the provided URL and save it locally

# Call the function with the URL of the media you want to download

# For more Python help, visit [](

# Copyright PHD


To address the issue effectively, we have created a custom function download_telegram_media that leverages Telethon’s capabilities within an AWS Lambda environment. Here’s a breakdown:

  • Import TelegramClient from telethon.sync and set up your client with session details.
  • The download_telegram_media function downloads media by utilizing the initialized client within a context manager block.
  • Proper exception handling is crucial for network requests and file operations.
  • Ensure all dependencies and configurations are included based on your application requirements.
    How can I troubleshoot issues related to Telethon methods in AWS Lambda?

    Ensure correct configuration of API credentials and grant necessary permissions for network access within AWS Lambda functions.

    Can I use asynchronous methods like client.download_media() directly in AWS Lambda?

    Due to asyncio event loop limitations in serverless environments like AWS Lambda, prefer synchronous versions when feasible.

    Are there alternative approaches for downloading media from Telegram in serverless functions?

    Consider pre-downloading media files outside serverless environments or explore other libraries compatible with such setups based on your use case.

    How does networking differ between traditional servers and serverless environments like AWS Lambda?

    Serverless environments impose restrictions on outbound network connections; optimize resource usage and reduce external dependencies where possible.

    Is there a cost implication when using external APIs like Telegram in cloud services such as AWS Lambda?

    Yes, invoking external APIs may incur costs based on factors like data transfer volume and processing time; monitor usage metrics through cloud provider dashboards.


    Successfully navigating challenges associated with integrating third-party libraries like Telethon into serverless environments requires strategic adaptation informed by platform-specific constraints. By following best practices, leveraging troubleshooting resources, and engaging with developer communities dedicated to supporting Python developers, we equip ourselves to overcome obstacles efficiently in dynamic technological landscapes.

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