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

Project description

zahlwort2num (v.0.2.1)

:de: :de: :de: A small but useful (due shortage of/low quality support for lang_DE) package for handy conversion of german numerals (incl. ordinal number) written as string to the from numbers.

To put it differently: It allows reverse text normalization for numbers.

This package might be a good complementary lib to

:crying_cat_face: Currently is doesn't support swiss variant. TBD :switzerland:

PyPi direct page of project


pip2 install zahlwort2num



import zahlwort2num as w2n


w2n.convert('Zweihundertfünfundzwanzig') # => 225
w2n.convert('neunte') # => '9.' 
w2n.convert('minus siebenhundert Millionen achtundsiebzig') # => -700000078

or even stuff like:

w2n.convert('sechshundertdreiundfünfzigtausendfünfhunderteinundzwanzig') # => 653521


Command line:

  • (Obviously it is better to use a parameter enclosed with apostrophs due to possible spaces)
bin/zahlwort2num-convert 'eine Million siebenhunderteinundzwanzig'



Already implemented features :sunglasses:

  • Theoretically it works for any numbers from range 0 upto 999 * 10^27 [big numbers]
  • Command-line mode (see above)
  • Supported with ordinal numerals (incl. inflections [sufficies like 'ste', 'ten' etc. ])
    In this case it returns coerced String type value e.g '15.' instead of Integer :point_up:
  • Relative mild rules in terms of trailing whitespaces, lower/upper-case (unification).
  • Handling of signed numerals (also ordinal ones) e.g 'minus zehn'

TODO / Known issues

  • [x] Make POC, functional for all common cases
  • [x] Ordinal number support
  • [x] Take care for exceptions / trailing whitespaces etc.
  • [x] Make structure + publish as PyPI package
  • [x] Command line support :computer:
  • [ ] More comprehensible tests
  • [ ] Swiss variant
  • [ ] More fault tolerant (ß -> ss) etc
  • [ ] Larger scale than 10^60
  • [ ] Ordinal with very large numbers (without addons) e.g Millionste
  • [ ] Few benchmark improvements (e.g tail recursion etc)
  • [ ] Better error handling + validation for idiotical cases (e.g minus null Miliarde)
  • [ ] Simplify/refactor POC code, add better documentation
  • [ ] Support for fractions?

Project details

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