+ adds conditional include which depends on Python version

! fixes support of Python 3: strings encoding/decoding and dict iterating

Author: JFF-Bohdan

liqpay/__init__.py

@@ -1 +1,6 @@
-__author__ = 'user'
+import sys
+
+if sys.version_info >= (3, 0):
+    from .liqpay3 import *
+else:
+    from .liqpay import *

liqpay/liqpay3.py

@@ -44,7 +44,7 @@ def __init__(self, public_key, private_key, host='https://www.liqpay.com/api/'):
     def _make_signature(self, *args):
         joined_fields = ''.join(x for x in args)
         joined_fields = joined_fields.encode('utf-8')
-        return base64.b64encode(hashlib.sha1(joined_fields).digest())
+        return base64.b64encode(hashlib.sha1(joined_fields).digest()).decode("ascii")
 
     def _prepare_params(self, params):
         params = {} if params is None else deepcopy(params)
@@ -83,11 +83,14 @@ def cnb_form(self, params):
             currency=currency if currency != 'RUR' else 'RUB',
             sandbox=int(bool(params.get('sandbox')))
         )
-        params_templ = {'data': base64.b64encode(json.dumps(params))}
+
+        encoded_data = base64.b64encode(json.dumps(params).encode("utf-8")).decode("ascii")
+        params_templ = {'data': encoded_data}
+
         params_templ['signature'] = self._make_signature(self._private_key, params_templ['data'], self._private_key)
         form_action_url = urljoin(self._host, '3/checkout/')
         format_input = lambda k, v: self.INPUT_TEMPLATE.format(name=k, value=v)
-        inputs = [format_input(k, v) for k, v in params_templ.iteritems()]
+        inputs = [format_input(k, v) for k, v in params_templ.items()]
         return self.FORM_TEMPLATE.format(
             action=form_action_url,
             language=language,