Simple change for python 3

[anuvab]

I was trying to run this library on python 3, and this line threw a syntax error. It's a simple fix to add brackets to the print statement, and looking through the code, there don't seem to be any other issues that stop python 3 support.

[sergioadonis]

No compatible with python3 ?

[fchevitarese]

I´ve made a small PR for this.

[abbasovalex]

@anuvab @sergioadonis @fchevitarese thank you for your participation. It had been fixed. Does this work fine? Could you please confirm?

[anuvab]

There are still some issues.

On this line

elif isinstance(json_obj, (basestring, int, float)):
    name, _, key = name.rpartition(self.separator)
    inputs.append(self._as_text_field(name, key, json_obj))

should be replaced by

import six
elif isinstance(json_obj, (six.string_types[0], int, float)):
    name, _, key = name.rpartition(self.separator)
    inputs.append(self._as_text_field(name, key, json_obj))

That's all I can see for now. But I don't use this on python3 anymore, so this is what I could see just reading the code. There might be more things to change, for proper support.

Created a PR.

[abbasovalex]

@anuvab thank you! I need scrutinize investigate and test it. It will take some time