unalengua is a free and unlimited python library that implemented Unalengua API.
pip install unalengua
from unalengua import Unalengua
unalengua = Unalengua(lang='Spanish')
print(unalengua.translate('Hola mundo!'))
For get all languages supported by Unalengua API, you can use the following code:
from unalengua import show_languages
print(show_languages())