country-iso2ify 0.1.2

Pure-Python country name to ISO-3166 alpha-2 resolver with custom aliases.

country-iso2ify

A lightweight Python library for converting free-form country names into standardized ISO-3166 alpha-2 codes.Designed for real-world datasets, APIs, and AWS Lambda — with no database, no external APIs, and safe fallback logic.

Features

• 🔍 Accurate ISO resolution using pycountry

• 🎛 Custom alias layer for outliers (e.g., Kosovo → XK, Ivory Coast → CI)

• ⚡ Fully in-memory, Lambda-friendly, fast lookups

• 🧠 Optional validated fuzzy matching

• 🔧 Easily extend with add_alias()

• 🗂 Includes curated default aliases

Installation

   pip install country-iso2ify

Or include in your Lambda layer / requirements.

Usage

  from country_iso2ify import get_resolver

  resolver = get_resolver()

  resolver.resolve("United States")     # "US"
  resolver.resolve("Ivory Coast")       # "CI"
  resolver.resolve("Kosovo")            # "XK"
  resolver.resolve("Republic of Korea") # "KR"

Add aliases dynamically

  resolver.add_alias("Mainland China", "CN")

Load aliases from S3

  resolver.load_custom_aliases_from_s3(
      bucket="my-bucket",
      key="configs/custom_alias.csv",
      skip_if_unchanged=True,  # default: compares ETag/LastModified before downloading
  )

The CSV should contain either a header row with columns like alias / name and alpha2 / alpha_2 / code, or simply two columns without headers (alias in the first column, ISO alpha-2 code in the second). Additional columns are ignored.

By default the resolver issues a cheap HeadObject call and skips the download if the ETag/Last-Modified matches the last loaded version. Pass skip_if_unchanged=False if you always want to re-fetch the file.

Enable safe fuzzy matching

  from country_iso2ify import CountryResolver

  resolver = CountryResolver(allow_fuzzy=True)
  resolver.resolve("Unted Sttes")  # "US"

Enforce strict ISO-only outputs

By default, unresolved names echo back the original input so downstream ETL jobs can inspect them later. If you prefer to drop unresolved values (or receive None for single-value lookups), enable strict mode:

  from country_iso2ify import CountryResolver

  resolver = CountryResolver(is_strict=True)
  resolver.resolve("Atlantis")        # None
  resolver.resolve("US|Atlantis")     # "US"

  resolver = CountryResolver(is_strict=False)
  resolver.resolve("US|Atlantis")     # "US|Atlantis"

Slack notifications for unresolved names

Set the COUNTRY_LOOKUP_SLACK_WEBHOOK environment variable to a Slack incoming-webhook URL to receive alerts whenever the resolver fails to map an input country name. Each unique unresolved name is reported once per process to avoid noisy repeats. You can optionally override the requests timeout (default 2.0 seconds) via COUNTRY_LOOKUP_SLACK_TIMEOUT.

Why this library?

• Works offline

• Handles non-standard names

• Deterministic, safe, and fast

• Perfect for ETL pipelines, APIs, and Lambda workloads

License

MIT License.