Googletrans is a free and unlimited python library that implemented Google Translate API. This uses the Google Translate Ajax API to make calls to such methods as detect and translate. Link

We can use Free Google Translate API in Python, which is a free of charge translator. Link

We need to install the API:

$ pip install googletrans

Let us try to translate "Hello" to Japanese, simply say:

from googletrans import Translator
translator = Translator()
result = translator.translate("Hello", dest="ja")

print(result)

In the above, we can specify any language code for 'dest' value. Get the supported language codes from the documentation