Quiz 2 Study Guide
Quiz Study Guides are provided as a courtesy. You may work with other students on the questions, and ask questions about the guide during evening ninja help sessions, on piazza, or during meetings with faculty and staff. We do not provide full solutions to the quiz guides.
You are responsible for all material covered through the end of Week 3.
In addition to all concepts from Quiz 1, you should understand the following:
data types: integer, float, string, Boolean
branching and looping
the accumulator design pattern
Python concepts and functions
basic arithmetic expressions using
conversion between the
the empty string
string concatenation with
+, string repetition with
string indexing with
forloops over strings
tracing a program (show the output)
the relational Boolean operators
the logical Boolean operators
nested statements (e.g., nested
elsein a loop, etc.)
accumulator pattern using string, float, or integer variables
Sample practice problems
Show the output from the following code fragments:
for x in range(6): print(x, x**2) print("done!")
text = "hello!" for i in range(len(text)): print("-" + text[i] + "-")
Given these assignments:
x = 5 y = 13 S = "we love computer science" Done = False
Show the value and type of each expression below:
x < 10 and y < 10 x < 10 or y < 10 x < 10 and x > 0 x > 10 or x < 0 (5/x) > 7.0 len(S) >= 10 S < S not Done
Consider the following program
x = 3 print("%d %d" % (0, x)) for i in range(5): if x % 2 == 0: x = x // 2 else: x = ( 3*x + 1 ) // 2 print("%d %d" % (i, x))
.. Trace the program and show its output. .. Create a table having columns for `i`, and `x` and show how the values change as the loop executes.
Write a program that asks the user how many grades they want to average, prompts the user for those grades, and prints the average.
Enter number of grades to average: 5 Enter grade: 96 Enter grade: 86 Enter grade: 76 Enter grade: 66 Enter grade: 56 Average is: 76.0
Write a program that asks the user for a word, and then uses an accumulator to print out the word with all lowercase "e"s changed to uppercase "E"s.
Enter a word: repetitive rEpEtitivE