1
h01
CS8 W19
Name:
(as it would appear on official course roster)
Umail address: @umail.ucsb.edu section
Optional: name you wish to be called
if different from name above.
Optional: name of "homework buddy"
(leaving this blank signifies "I worked alone"

h01: Perkovic 2.1, 2.2 (Expr, Vars, Assignment, Strings)

ready? assigned due points
true Thu 01/10 02:00PM Wed 01/16 09:00AM

You may collaborate on this homework with AT MOST one person, an optional "homework buddy".

MAY ONLY BE TURNED IN IN THE LECTURE/LAB LISTED ABOVE AS THE DUE DATE,
OR IF APPLICABLE, SUBMITTED ON GRADESCOPE. There is NO MAKEUP for missed assignments;
in place of that, we drop the lowest scores (if you have zeros, those are the lowest scores.)

READING ASSIGNMENT

Please read Perkovic 2.1, 2.2 (Expr, Vars, Assignment, Strings). Then complete these problems and turn in your completed homework during your registered lab section..

  1. (10 pts) Please fill in the information at the top of this homework sheet, including your name and umail address. If the other two items apply, please fill them in as well. Please do this every single time you submit homework for this class. It is important to fill in both name and umail every time, since handwriting is sometimes difficult to decipher. Having both helps us ensure you get credit for your work.

    DO NOT staple, paper clip, spit-fold-and-tear, or do ANYTHING that would make it difficult to automatically feed your paper through a scanner.

  2. Section 2.1 describes how several operators and built in functions in Python work. What would be the result of entering the following at the Python interactive shell prompt?

    (Note: You are encouraged to check your answers at the Python prompt before turning in your work, but try this on paper first, just by reading the text and trying to predict what will happen. Then try typing in the results at the Python prompt. Change your answers if they were mistaken, but even more important, try to figure out why you were incorrect.)

    Be very precise. Note that True is not the same in Python as true; upper vs. lower case matters. You will not get full credit for answers that are not precisely correct.

    Points Expression Result Points Expression Result
    (4 pts) 2 + 3 * 5   (4 pts) 4 < 3  
    (4 pts) 19 % 3   (4 pts) 1 + 2 == 3  
    (4 pts) 5 ** 2   (4 pts) True and False  
    (4 pts) 7 // 2   (4 pts) True or False  
    (4 pts) 9 // 2   (4 pts) 5 != 10//2  

  3. (5 pts) As described in section 2.1, a Python assignment statement contains the assignment operator, an expression and a variable, but not in that order.

    What is the correct order for these three parts, reading from left to right?

  4. (5 pts) Section 2.1 contains a list of thirty-three reserved words in Python that may not be used as the name of a variable. You don’t need to memorize this list, but you do need to know where to find it, either in the book, or online. So, to be sure you can find it, list all of the Python reserved words that start with the letter c or f.

  5. Section 2.2 describes strings in Python, including the concepts of “dictionary order” (also called “lexicographic order”), concatenation of strings, multiplication of strings times an integer, the in operator, the not in operation, the len function, and string indexing. Review that material.

    Then, assuming the following assignment statements have been entered at the Python prompt:

    school = "UCSB"
course = "CS8"
qtr = "F17"

    Indicate the value of each of these expressions:

      Expression Result     Expression Result
    (4 pts) school * 2     (4 pts) school > course  
    (4 pts) qtr[1:3]     (4 pts) qtr < school  
    (4 pts) course[0:2]     (4 pts) len(qtr) > 4  
    (4 pts) 'D' in school     (4 pts) school[-1]  
    (4 pts) 'E' not in school     (4 pts) school[0]