Create a week02 subdirectory in your cs21/class directory:

      % cd 
      % cd cs21/class
      % pwd
        /home/your_user_name/cs21/class

      % mkdir week02

Then, from within your week02 subdirectory copy over some python files from my public directory:

    % cd week02
    % pwd
      /home/your_user_name/cs21/class/week02

    % cp ~newhall/public/cs21/week02/* .
    % ls

We are going to do some of the following:

Numeric Operators: open expr.py in vim. It contains some examples of numeric expressions and order of evalution. Let's take a look at some of them...
Accumulator Pattern: together we are going to write a program that computes the average of 5 integer values that are entered by a user. Let's open a new file in vim called ave.py.
Try out the math library: open test_math.py in vim. In another window lets run python interactively and take a look at the functions available from the math library:
```
		$ python
		>>> import math
		>>> help (math)
		
```
Now, lets try some out in test_math.py.