Python 3.3.2 (v3.3.2:d047928ae3f6, May 13 2013, 13:52:24) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> 5 + 3
8
>>> 5/2
2.5
>>> $100/2
SyntaxError: invalid syntax
>>> 100/2
50.0
>>> # this is a comment character
>>> students = 90
>>> lab_capacity = 30
>>> labs_needed = students/lab_capacity
>>> labs_needed
3.0
>>> # in Math:  4 + 5 = 11 - 2
    # But, that isn't legal in Python:
>>> 4 + 5 = 11 - 2
SyntaxError: can't assign to operator
>>> total_points = 112
>>> my_points = 95
>>> my_score = my_points / total_points
>>> my_score
0.8482142857142857
>>> print("My score on the test was",my_score)
My score on the test was 0.8482142857142857
# At this point, we ran the program bio_calc.py
# And, we fixed it in class, so that it prints, 
#   e.g., 86.363636363636363  instead of 0.8636363636363
>>> 
My score on the BIO test was 86.36363636363636
Doing fine
>>> 
>>> # storewide sale
>>> 20/100
0.2
>>> discount_percentage = .2
>>> original_price = 100
>>> discount = original_price * discount_percentage
>>> discount  
20.0
>>> sale_price = original_price - discount
>>> sale_price
80.0
# A second way to calculate the sale_price:
>>> sale_price = original_price * (1 - discount_percentage)
>>> sale_price
80.0
# The following is to show that you can change the value
# of a variable.  You can even change it to a different type
# of variable.
# Here, we assign an int
>>> discount_percentage = 7
>>> discount_percentage
7
# Now, we assign a string, and Python doesn't complain!
>>> discount_percentage = "Hello World"
>>> discount_percentage
'Hello World'
>>>