Python 3.5.3 (v3.5.3:1880cb95a742, Jan 16 2017, 08:49:46) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable.
Visit http://www.python.org/download/mac/tcltk/ for current information.

============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
>>> compute_rate(3, 0.1, 5)
3.5
>>> compute_level(3, 0.1, 5)
3.0
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    compute_level(3, 0.1, 5)
  File "/Users/ssheehan/Downloads/sea_level.py", line 17, in compute_level
    level = level + curr_rate
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
>>> compute_level(3, 0.1, 5)
3.0
3.1
3.2
3.3
3.4
16.0
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
>>> compute_level(3, 0.1, 5)
16.0
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Traceback (most recent call last):
  File "/Users/ssheehan/Downloads/sea_level.py", line 13, in <module>
    print(rate) # this will never be executed
NameError: name 'rate' is not defined
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Enter rate (mm/yr) = 3
Enter acceleration (mm/yr^2) = 0.1
Enter # of years = 8

Traceback (most recent call last):
  File "/Users/ssheehan/Downloads/sea_level.py", line 43, in <module>
    main()
  File "/Users/ssheehan/Downloads/sea_level.py", line 37, in main
    for y in range(years+1):
NameError: name 'years' is not defined
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Enter rate (mm/yr) = 3
Enter acceleration (mm/yr^2) = 0.1
Enter # of years = 8

0
8 3.0 None
3.0
8 3.1 None
6.1
8 3.2 None
9.3
8 3.3 None
12.600000000000001
8 3.4 None
16.0
8 3.5 None
19.5
8 3.6 None
23.1
8 3.7 None
26.8
8 3.8 None
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Enter rate (mm/yr) = 3
Enter acceleration (mm/yr^2) = 0.1
Enter # of years = 8

0
level is None
3.0
level is None
6.1
level is None
9.3
level is None
12.600000000000001
level is None
16.0
level is None
19.5
level is None
23.1
level is None
26.8
level is None
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Enter rate (mm/yr) = 3
Enter acceleration (mm/yr^2) = 0.1
Enter # of years = 8

8 3.0 0
8 3.1 3.0
8 3.2 6.1
8 3.3 9.3
8 3.4 12.600000000000001
8 3.5 16.0
8 3.6 19.5
8 3.7 23.1
8 3.8 26.8
>>> 
============== RESTART: /Users/ssheehan/Downloads/sea_level.py ==============
Enter rate (mm/yr) = 3
Enter acceleration (mm/yr^2) = 0.1
Enter # of years = 8

0 3.0 0
1 3.1 3.0
2 3.2 6.1
3 3.3 9.3
4 3.4 12.6
5 3.5 16.0
6 3.6 19.5
7 3.7 23.1
8 3.8 26.8
>>> balance = 100
>>> rate = 0.05
>>> new_balance = balance + balance*rate
>>> new_balance
105.0
>>> new_balance = balance * (1+rate)
>>> new_balance
105.0
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
New amount is 100
>>> 
>>> amount = 100
>>> balance = amount # where our formal parameters get assigned actual values
>>> balance
100
>>> rate = 0.05
>>> new_balance = balance * (1+rate)
>>> balance = new_balance
>>> balance
105.0
>>> amount
100
>>> # amount was never reassigned a new value
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
New amount is None
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
New amount is 105.0
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
New amount is 100
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
New amount is 105.0
>>> 
============ RESTART: /Users/ssheehan/Documents/interest_rate.py ============
[1050.0, 2310.0, 840.0, 378.0]
>>> # lists are mutable and can be changed within a function
>>>