Description of problem:

Attached example fails in python3, works in python2


Version-Release number of selected component (if applicable):

0.4.8-1


How reproducible:
every time


Steps to Reproduce:
1. sudo python3 dnf-api.py
2.
3.

Actual results:

cachedir: /var/cache/dnf/i386/20
=============== install btanks =====================
# of packages added : 1
<hawkey.Goal object at 0xb6c3ef2c>
   Install - btanks-0.9.8083-7.fc20.i686
   Install - btanks-data-0.9.8083-7.fc20.noarch
[<hawkey.Package object id 3038, btanks-0.9.8083-7.fc20.i686, fedora>, <hawkey.Package object id 3039, btanks-data-0.9.8083-7.fc20.noarch, fedora>]
Downloading Packages
{}
Running Transaction
Traceback (most recent call last):
  File "test.py", line 84, in <module>
    base.do_install()
  File "test.py", line 78, in do_install
    print(self.do_transaction())
  File "/usr/lib/python3.3/site-packages/dnf/base.py", line 627, in do_transaction
    self.transaction.populate_rpm_ts(self.ts)
  File "/usr/lib/python3.3/site-packages/dnf/transaction.py", line 183, in populate_rpm_ts
    ts.addInstall(hdr, tsi, 'i')
  File "/usr/lib/python3.3/site-packages/rpm/transaction.py", line 48, in addInstall
    if isinstance(item, basestring):
NameError: global name 'basestring' is not defined

Expected results:
No Traceback

Additional info: