Hello!

In gpg.constants, there is a subclass/attribute named "import". However, this is a forbidden keyword per python (because of the "import" statement):

>>> import keyword
>>> keyword.iskeyword('import')
True

leading to strange errors like this:

>>> import gpg
>>> gpg.constants.import.NEW
  File "<stdin>", line 1
    gpg.constants.import.NEW
                       ^
SyntaxError: invalid syntax

perhaps change gpg.constants.import to gpg.constants.import_type?