[Python] NameError: global name 'unicode' is not defined - in Python 3

I am trying to use a Python package called bidi. In a module in this package (algorithm.py) there are some lines that give me error, although it is part of the package.

Here are the lines:

# utf-8 ? we need unicode
if isinstance(unicode_or_str, unicode):
text = unicode_or_str
decoded = False
else:
text = unicode_or_str.decode(encoding)
decoded = True


and here is the error message:

Traceback (most recent call last):
File "<pyshell#25>", line 1, in <module>
bidi_text = get_display(reshaped_text)
File "C:\Python33\lib\site-packages\python_bidi-0.3.4-py3.3.egg\bidi\algorithm.py", line 602, in get_display
if isinstance(unicode_or_str, unicode):
NameError: global name 'unicode' is not defined


How should I re-write this part of the code so it works in Python3? Also if anyone have used bidi package with Python 3 please let me know if they have found similar problems or not. I appreciate your help.

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