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Exam 1 Review

Course Announcements

  • A2 due tonight (11:59 PM)

  • E1 is on Thursday

    • closed notes in-class (12.5 pts) + open notes/open Internet take-home (2.5 pts)

    • answer keys available

    • no office hours on Thursday

  • CL3 due Friday

Notes:

  • Review slides (thanks Ana & Nikita) here + Extra OHs

  • CL1 & A1 Scores Posted

    • A1 regrades - fetch feedback on datahub; open for 3d; post privately to Instructors on Piazza

    • CL - if you spent an hour of dedicated effort and didn’t get full credit, reach out to me

Exam 1 Review#

In-class:

  • bring a writing utensil

  • 20 Questions

    • 8 multiple choice

    • 9 fill in the blanks

    • 1 draw arrows from concept to code

    • 2 short answer

Take-home:

  • 2 Questions

    • 1 read/debug code

    • 1 write a function

  • released at 3:30 PM; due 11:59 PM

  • fewer asserts than assignments

Big Topics Covered#

  • Variables & Data Types

    • Integers, Floats, Strings, Booleans, Lists, Tuples, Dictionaries

  • Operators

    • logical, math, comparison, membership

  • Functions

    • definition & execution

    • default values

    • keyword vs. positional

  • Conditionals

    • if/elif/else

Expectations:

  • Be able to explain/describe main concepts and vocabulary

  • Be able to read code and determine what it does

  • Be able to debug given code when a task is specified

  • Describe the logic/code needed to accomplish a task

Questions?

Indexing#

The list burritos has been provided in the cell below for you.

Use the burritos variable and indexing to generate each of the four variables at left below, so that each stores the output at right below. For example, burritos_a should refer to burritos in its answer and use indexing to store the string ‘Cali’.

  • burritos_a | 'Cali'

  • burritos_b | ['Adobada', 'Bean and Cheese', 'Steak Ranchero', 'Carnitas']

  • burritos_c | ['Cali', 'Steak Ranchero']

  • burritos_d | ['Chicken', 'Chile Verde', 'Adobada', 'Steak Ranchero']

# this variables provided for you
# this cell is read-only (cannot be changed)
burritos = ['Chicken', 'Carne Asada', 'Chile Verde', 'Cali', 
            'Adobada', 'Bean and Cheese', 'Steak Ranchero',
            'Carnitas']

# answer here

For iclicker: A) I did it. B) Tried and Stuck. C) I’m lost.

Debugging#

Find and fix the errors in make_change().

This function should make_change(money) - turns decimal dollars into a number of coins, returning how many quarters and pennies to return. (We will just work with two coin types for now, to keep things simple)

def make_change(money)
    
    # turn it from dollars into cents 
    money = money * 100 
    
    # how many quarters to give
    quarters = money // 25
    
    # how much money is left after the quarters
    money = money - quarters*10
    
    # how many pennies to give
    pennies = money / 1

# debug here

# test out your edits here

For iclicker: A) I did it. B) Tried and Stuck. C) I’m lost.

Define a function#

Write a function with the following properties:

'''
max_of_3(n1, n2, n3) - returns the maximum of three numbers

inputs:
n1, n2, n3 - the numbers 

returns:
the biggest number among n1, n2, n3

NB: you may assume there are no ties among n1, n2, n3;
    and you don't need to error check the inputs
'''

# answer here

# test here

For iclicker: A) I did it. B) Tried and Stuck. C) I’m lost.

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