python-phonenumbers is a Python port of Google's libphonenumber library that parses, validates, and formats international phone numbers.
The library solves the problem of reliably handling phone numbers across different countries and formats. It works by providing a PhoneNumber object that can be created from string input via a parse function, which requires specifying the originating country unless the number is in E.164 format. Once parsed, numbers can be validated to check whether they are possible numbers with the correct digit count or valid numbers in assigned exchanges. The library offers several specialized tools: a format_number function for standardizing output across multiple formats, an AsYouTypeFormatter for applying formatting as users type, a PhoneNumberMatcher for extracting phone numbers from larger text blocks, and geocoding and carrier lookup capabilities for certain regions.
Developers should choose this tool if they need robust international phone number handling in Python. It suits applications with user-facing phone number input, systems that process phone numbers from varied sources, or services operating across multiple countries. The library maintains compatibility across Python versions in a single codebase without requiring conversion tools. The README notes that the library includes substantial metadata that can create memory overhead, and mentions two mechanisms exist for addressing this concern, though specific details are not elaborated.
The project maintains active synchronization with upstream libphonenumber releases through documented release history. Development follows a structured approach with unit tests covering the available functionality and comprehensive documentation hosted separately from the repository.
