## Week 16 agenda -- last class and quiz

11 Dec 2011We'll have one last quiz, which will cover all the major Python concepts we've talked about:

- variables and types
- for loops
- lists
- conditionals
- working with files

You'll have to have all homework in by Thursday night.

### Quiz examples

Recall that

`sys.argv`

is a list containing all the words you type on the command line. What does the following program do?`import sys num = 1 for x in sys.argv: print(num, x) num = num + 1`

Fill in the definition of the following function so that it prints

`even`

if the input is an even number, and`odd`

if the input is an odd number. The`%`

operator can be used to compute the remainder when dividing one number by another -- for example,`11 % 3`

gives 2, because`11`

divided by`3`

has remainder 2.`def print_parity(x): ...`

Explain in words (you don't have to write any code) how to write a program that reads a file, and then overwrites the file with the same contents except all in uppercase.

What is the value of

`x`

at the end of the following program?`a = 1 b = 2 if a > b: x = a else: x = b`

Write a function that takes 2 numbers as input and returns the largest of the 2 numbers.

Fill in the following function so that it takes as list of numbers as input, and returns a new list consisting of the original numbers that were positive.

`def positives(numbers): output = [] for n in numbers: if ...: ... return ...`

Define a function called

`triangle`

that prints a triangle of height`n`

when given input`n`

. For example,`triangle(4)`

should print something like:`* ** *** ****`