ModuleNotFoundError: No module named 'cassandra'

After installing cassandra driver by running the command:
`sudo pip3 install cassandra-driver`, I am getting the error `ModuleNotFoundError: No module named 'cassandra'` when I try to import the module by running the line `cassandra`.

I then tried to see what all modules are installed in `pip3` by running the command `pip3 freeze`:

astroid==2.1.0
cassandra-driver==3.16.0
isort==4.3.4
lazy-object-proxy==1.3.1
mccabe==0.6.1
pylint==2.2.2
six==1.12.0
wrapt==1.10.11
Seeing no `cassandra`, I tried to import the visible module: `cassandra-driver` and then I ended up with the error:

File "<stdin>", line 1
import cassandra-driver
^
SyntaxError: invalid syntax

Also, when I do correct the hyphen issue with this:
`__import__("cassandra-driver")`, I get the error:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cassandra-driver'

My `which python3` is: `/usr/local/bin/python3` and my `which pip3` is: `/usr/local/bin/pip3`

My OS is MacOS

How to install `cassandra`?
Note: I am following [this][1] documentation.


[1]:

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Did you try to run these demos (from those docs)?

"If successful, you should be able to build and install the extension (just using setup.py build or setup.py install) and then use the libev event loop by doing the following:"

>>> from cassandra.io.libevreactor import LibevConnection
>>> from cassandra.cluster import Cluster

>>> cluster = Cluster()
>>> cluster.connection_class = LibevConnection
>>> session = cluster.connect()

There is a probability that actual module is named differently, e.g. there is another external package called Pillow, but you import it with name "PIL".
In docs they are importing `from cassandra.cluster`

[Docs I'm referring to][1]


[1]:

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```bash
$ echo 'import cassandra.cluster' > cassandra.py && python3 cassandra.py
Traceback (most recent call last):
File "./cassandra.py", line 3, in <module>
import cassandra
File "/home/xxx/cassandra.py", line 4, in <module>
import cassandra.cluster
ModuleNotFoundError: No module named 'cassandra.cluster'; 'cassandra' is not a package
```

Using a different filename, the error disappears:
```bash
echo 'import cassandra.cluster' > tmp.py && python3 cassandra.py
```

So, for me, the error was that my own program overrode the package. O.o