It looks like you're trying to type the python Arithmetic.py
command into an IPython shell. Instead, make sure you're using your operating system's command prompt. (You can get out of a Python or IPython shell by typing exit()
.)
On Windows, the command prompt looks like this:
C:\Users\Carter>
On Linux, the command prompt looks like this:
carter@carters-computer:~$
In Mac OS X, it looks like this:
Carters-Macbook:~ csande$