pygsm7 is a Python package that provides functions for encoding and decoding messages using GSM 7-bit encoding. It is designed to facilitate the processing of text messages in the context of SMS and mobile communication.

It also provides two text-encoding workflows that are common in SMS and modem projects:

• Full-Unicode hex encoding and decoding through pygsm7.encode() and pygsm7.decode()
• True packed GSM 03.38 7-bit encoding and decoding through pygsm7.encode_gsm7() and pygsm7.decode_gsm7()

• Round-trip full Unicode text, including emoji and control characters, as uppercase UTF-16BE hex
• Encode and decode packed GSM 7-bit payloads using the GSM 03.38 default and extension tables
• Keep the API small and easy to use for scripts, modem integrations, and SMS tooling

Install pygsm7 with pip:

pip install pygsm7

Use encode() and decode() when you need full Unicode coverage.

import pygsm7

encoded = pygsm7.encode("Hello world")
decoded = pygsm7.decode(encoded)

print(encoded)
print(decoded)

Use encode_gsm7() and decode_gsm7() for packed GSM 03.38 payloads.

import pygsm7

packed = pygsm7.encode_gsm7("Hello {world} \\u20AC")
decoded = pygsm7.decode_gsm7(packed)

print(packed)
print(decoded)

Pull requests and issues are welcome. Refer to CONTRIBUTING.md.

If you discover a security vulnerability, please send an e-mail to [email protected].

This package is open-source software licensed under the MIT license.