Python 3 renamed the unicode type to str, the old str type has been replaced by bytes.

if isinstance(unicode_or_str, str):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True

You may want to read the Python 3 porting HOWTO for more such details. There is also Lennart Regebro's Porting to Python 3: An in-depth guide, free online.

Last but not least, you could just try to use the 2to3 tool to see how that translates the code for you.

Django 1.5 has experimental support for Python 3, but the Django 1.5 tutorial is written for Python 2.X:

This tutorial is written for Django 1.5 and Python 2.x. If the Django version doesn’t match, you can refer to the tutorial for your version of Django or update Django to the newest version. If you are using Python 3.x, be aware that your code may need to differ from what is in the tutorial and you should continue using the tutorial only if you know what you are doing with Python 3.x.

In Python 3, you should define a __str__ method instead of a __unicode__ method. There is a decorator python_2_unicode_compatible which helps you to write code which works in Python 2 and 3.

from __future__ import unicode_literals
from django.utils.encoding import python_2_unicode_compatible

@python_2_unicode_compatible
class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __str__(self):
        return self.question

For more information see the str and unicode methods section in the Porting to Python 3 docs.

There is no such name in Python 3, no. You are trying to run Python 2 code in Python 3. In Python 3, unicode has been renamed to str.

However, you can remove the unicode() call altogether; open() produces a file object that already decodes data to Unicode for you. You probably want to tell it what codec to use, explicitly:

fileMain = open("dictionary_15k.txt", "r", encoding="utf-8")
for line1 in fileMain:
    dictWords.append(line1.strip())

You may want to switch to Python 2 if your tutorial is written with that version in mind.