Installing and using pip, "SyntaxError: invalid syntax"

Installing and using pip, "SyntaxError: invalid syntax"

I followed these instructions for installing pip on Windows 7. When I try
to install the example package with pip install httpie (or any other
package), it gives me the following error:
SyntaxError: invalid syntax
It also highlights the word install. And that's it. I am using Python
3.3.1 and used the corresponding installers in the instructions at the
link above. Finally, I apologize if you consider this a duplicate, but
Stack Overflow will not allow me to post on the answer in the original
thread and I am getting an error message that they do not discuss.