zahlwort2num

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A small package for handy conversion of german numerals (also ordinal / signed) written as words to numbers.

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# ZahlWort2num (v.1.0.1)

🇩🇪 🇩🇪 🇩🇪
A small but useful package (due to shortage of/low quality support for `lang_de`) for handy conversion of German numerals (incl. ordinal numbers) written as strings to numbers.

To put it differently: _It allows reverse text normalization for numbers_.

This package might be a good complementary lib to https://github.com/savoirfairelinux/num2words

# PyPI Project Page
https://pypi.org/project/zahlwort2num/

# Web Demo
Try the interactive web demo: [zahlwort2num Demo](index.html)

## Table of Contents

- [Installation](#installation)
- [Usage](#usage)
- [Features](#features-)
- [Development](#development)
- [Roadmap / Known Issues](#roadmap--known-issues)
- [Acknowledgments](#acknowledgments-)

# Installation

```bash
pip install zahlwort2num
```

# Usage

### Basic Usage

```python
import zahlwort2num as w2n
```

### Examples

```python
# Basic cardinal numbers
w2n.convert('Zweihundertfünfundzwanzig')  # => 225

# Ordinal numbers (return as string with dot)
w2n.convert('neunte')  # => '9.'

# Negative numbers
w2n.convert('minus siebenhundert Millionen achtundsiebzig')  # => -700000078

# Complex large numbers
w2n.convert('sechshundertdreiundfünfzigtausendfünfhunderteinundzwanzig')  # => 653521

# Fractions
w2n.convert('ein und zwei')  # => 0.5
w2n.convert('drei viertel')  # => 0.75
w2n.convert('ein halb')      # => 0.5

# Decimals
w2n.convert('zwei komma fünf')  # => 2.5
w2n.convert('zehn komma eins')  # => 10.1

# Regional variants
w2n.convert('zwoa')      # => 2  (Austrian)
w2n.convert('dreissig')  # => 30 (Swiss)
```

### Command Line Usage

Use quotes around parameters containing spaces:

```bash
zahlwort2num-convert 'eine Million siebenhunderteinundzwanzig'
```

# Development

### Setup

Install development dependencies:

```bash
python3 -m pip install -r requirements.txt
```

### Testing

Run the test suite:

```bash
python3 -m unittest
```

### Linting

Run the linter:

```bash
python3 -m venv venv
source ./venv/bin/activate
python3 -m pip install flake8
flake8 ./zahlwort2num/*.py --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
```

# Documentation

*More comprehensive documentation and examples coming soon.*

# Features ✨

- **Large Numbers**: Theoretically supports numbers from 0 up to 999 × 10^27
- **Command Line Interface**: Use from terminal with `zahlwort2num-convert`
- **Ordinal Numbers**: Supports ordinal numerals (e.g., "erste", "zweite") with inflections (suffixes like 'ste', 'ten', etc.)
  - Returns strings with dots for ordinals (e.g., '15.' instead of integer)
- **Case & Whitespace Handling**: Fault-tolerant with trailing whitespaces and case variations
- **Signed Numbers**: Handles negative numbers (e.g., 'minus zehn') and negative ordinals
- **Swiss German Support**: Includes Swiss variants (e.g., "dreissig" vs "dreißig")
- **Austrian German Support**: Includes Austrian variants (e.g., "zwoa" for 2)
- **Fault Tolerance**: Handles ß → ss conversion and other common variations
- **Fraction Support**: Advanced fraction conversion
  - Basic fractions (e.g., "ein und zwei" → 0.5)
  - Extended fractions (e.g., "drei viertel" → 0.75, "ein halb" → 0.5)
- **Decimal Support**: Decimal number conversion (e.g., "zwei komma fünf" → 2.5)

# Roadmap / Known Issues

- [x] ~~Make POC, functional for all common cases~~
- [x] ~~Ordinal number support~~
- [x] ~~Handle exceptions and trailing whitespaces~~
- [x] ~~Create package structure and publish to PyPI~~
- [x] ~~Command line support~~
- [x] ~~Support both direct and indirect forms (einhundert/hundert)~~
- [x] ~~Simplify/refactor POC code and improve documentation~~
- [x] ~~Add "zwo" variant support~~
- [x] ~~Add linter and test suite~~
- [x] ~~Swiss German variants~~
- [x] ~~Fault tolerance (ß → ss conversion)~~
- [x] ~~Support for scales larger than 10^60~~
- [x] ~~Ordinal numbers with large scales (e.g., "Millionste")~~
- [x] ~~Performance improvements (tail recursion, etc.)~~
- [x] ~~Better error handling and validation~~
- [x] ~~Basic fraction support~~
- [x] ~~More comprehensive test cases~~
- [x] ~~Extended fraction support (e.g., "drei viertel" → 0.75)~~
- [x] ~~Decimal number support (e.g., "zwei komma fünf" → 2.5)~~
- [x] ~~Austrian German variants~~

# Changelog

## v1.0.1 (2026-01-22)
- Documentation improvements and changelog cleanup

## v1.0.0 (2026-01-22)
- Added extended fraction support (e.g., "drei viertel" → 0.75, "ein halb" → 0.5)
- Added decimal number conversion (e.g., "zwei komma fünf" → 2.5)
- Added Austrian German variants (e.g., "zwoa" for 2)
- Enhanced test coverage and documentation

## v0.4.3 (2026-01-22)
- Enhanced testing and performance improvements
- Bug fixes and documentation updates

## v0.4.0 (2022-10-28)
- Major feature expansion with large scale numbers and complex ordinals
- Performance optimizations and enhanced error handling

## v0.3.0 (2022-01-09)
- Ordinal number support and Swiss German variants
- Fault tolerance improvements

## v0.2.1 (2019-05-22)
- Command line interface and polish improvements

## v0.1.9 (2019-05-08)
- Swiss German support and ß/ss conversion
- Enhanced regional compatibility

## v0.1.6 (2019-05-05)
- Initial release with core German number parsing
- Basic fraction support and negative numbers

# Acknowledgments

Special thanks to our contributors:
- [@warichet](https://github.com/warichet) for bug fixes and "hundert" support
- [@spatialbitz](https://github.com/spatialbitz) for enhanced test cases
- [@psawa](https://github.com/psawa) for "zwo" variant support and unit tests

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