The slugify package you installed isn't built for python 3, it currently only supports python 2. And it is very unlikely it will get updated. One of the easiest way to tell is that throughout its source code, it used the python 2 keyword unicode in which it doesn't exist in python 3.

You probably did:

pip install slugify

That was an outdated package, not the one you linked.

To install the slugify package you linked, https://pypi.python.org/pypi/python-slugify, it's called python-slugify when you install it, it supports all recent python versions. And have way more functionalities.

pip install python-slugify

And import the same way as the other package:

from slugify import slugify

Note: YOU MUST DELETE THE ORIGINAL PACKAGE YOU INSTALLED, since they uses the same name.

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.