Solved: set mime type

The MIME (Multipurpose Internet Mail Extensions) type represents the type and format of a file, defining how that file is transmitted on the internet. This ensures compatibility across different systems and allows browsers to understand how to handle different file types. The importance of setting the correct MIME type when working with web technologies cannot be overstated. In Python, this can be achieved through various libraries and functions which will be detailed in this article.

Python is a powerful language that has in-built modules and third-party libraries for handling almost any task, including MIME type setting. This enables developers to create and send multi-media mail, clearly specifying the type of content like HTML, audio, visual, and others using protocols like SMTP or HTTP.

Using the Mimetypes Module in Python

The `mimetypes` module in Python provides functions to determine or guess the type of a file. Here’s an example of how to use it:

import mimetypes

mimetype = mimetypes.guess_type('image.jpg')[0]

This will print: ‘image/jpeg’, which is the MIME type for jpeg images. In this code, we used the `guess_type` function, which guesses the type of file based on its extension.

The `mimetypes` module processes mappings from filename extensions to MIME types, and from MIME types to filename extensions. If optional strict is true (the default), only the official MIME types are used.

Sending Emails with smtplib and email Libraries

The Python standard library provides the `smtplib` for defining an SMTP client session object that can be used to send emails to any internet machine with an SMTP or ESMTP listener daemon.

Another Python library, `email`, is for managing email messages including MIME and other RFC 2822-based message documents. It lets developers create, manipulate, and read email messages.

Here’s a simple example of using these two libraries to send an email with a MIME type:

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

message = MIMEMultipart("alternative")
message["Subject"] = "Hello, World!"
text = """
This is a simple text email."""
html = """
       This is a simple HTML email!
part1 = MIMEText(text, "plain")
part2 = MIMEText(html, "html")


with smtplib.SMTP('localhost') as server:

In the above code, MIMEText objects are created for both plain text and HTML data. These are then added to an MIMEMultipart object with the attach() method. This email message has a MIME type of multipart/alternative.

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