Trouble verifying installation of cassandra driver 3.8.1

[Billy Mack]

Hi.. I'm a newbie to both python and apache cassandra:

Trying to follow the installation instructions from http://datastax.github.io/python-driver/installation.html

I recieve a syntax error at the verification step (trying to print the version number).

This is confusing to me because the installation claimed to be successful.

Perhaps I am making a very simple mistake.. I tried a few permutations of the instruction as seen in the attached screen shot.

Any insight is much appreciated,

Thanks.

[Alex Baeza]

Your issue is you are using python3 with instructions for python2

python 3 has a different print statement.

You have to change (python2):

python -c ‘import cassandra; print cassandra.__version__’

To python3 syntax:

python -c 'import cassandra; print(cassandra.__version__)’

Breakdown:

python -c

This part tell python to use the following command (as specified by the quoted string that follows -c).

quoted string (part 1) ‘import cassandra;

The first part of the quoted string tells python to import the cassandra library you just installed, the semicolon allows you to specify

more than one command on the same line.

quoted string (part 2) print(cassandra.__version__)’

In cassandra 3 your print statements need parenthesis around the thing you want to print. In version 2 you didn’t need this, which is

why your example was failing.

Make sure you are aware of which version of python you are using for your various development projects.

Take a look at venv https://docs.python.org/3/library/venv.html. This allows you to create different sandboxes to work in, so that some

environments can have different packages installed. For example you may want to write a program for Cassandra in one env and

write another program that has nothing to do with cassandra in a different env.

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[Billy Mack]

Thank you for the assistance and link; very helpful! 

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