PLTW: Computer Science Essentials - ACTUAL Quiz (5/5/23)

What file naming convention used in python? Give an example.

underscore_case

What is the file extension used for python files?

.py

Why is it important to use descriptive names for code files?

so that you know what each code file is and so that you can find it

Describe how a hashtag (#) is used to modify code.

It disables a line a code used for comments and headings.

Describe how a triple quotation mark (“““) is used to modify code.

Triple quotes are used to disable a section of code which can be used for debugging.

What type of function is a print statement?

built-in function

Besides the print statement, name one other built-in function in python.

input

What is the first thing that you would type to define a function in python?

def

How many times can a function be called upon in a program?

infinite

Write a print statement that says “I love nacho day”

print(“I love nacho day”)

What is the smallest unit of storage that a program can use?

variable

What is the difference between an assignment operator and an equality operator.

assignment operator uses one equal sign, equality operator uses two equal signs.

List 4 common data types.

float, integer, string, Boolean

What are 2 general types of variables?

local and global variables

True or false: Variables are case-sensitive

true

Give an example of when you would need to convert data types.

You may need to convert a data type if the user input is going to be a number, not a word. You would change the data type from a string to an integer.

What is an “argument” in computer science?

the values used in a program or a subroutine.

True or false: The Boolean values of true and false must be capitalized or the code editor will not recognize them as such.

true

What integers do the Boolean values correlate with?

0 and 1

Write a print statement that has a user input.

print(input(“How old are you?"”))

Abstraction is technique or process that manages _____ in a program or computer system by hiding specific details - allowing the programmer to focus on ____ and functions rater the the final output

**complexity, concepts**

Which statement best describes abstraction?

the result of designing a program where the focus is on what each step does instead of how the steps are implemented

Which situation is the best example of abstraction?

a teacher explains the mechanics of an engine by telling the students that turning the key will start a car

Within complex code, a programmer is likely to use a ____ level of abstraction to focus on the _____ details of a problem.

high, general

On a spreadsheet, the SUM command can be used to find the sum of the numbers in specific cells. For example, if you needed the sum of the cells A1 through M1, you would enter the formula =SUM(A1:M1). After entering the formula into a cell and pressing enter, the formula disappears and is replaced by the sum.

Why is the formula disappearing an example of abstraction?

The SUM formula does not need to be seen or understood in order to calculate the sum of the cells.

Image file

a digital representation of visual information

Audio file

a digital depiction of a sound waveform

Video file

a large, compressed file containing file containing visual and audio content

Programming file

a set of instruction that performs a task

Arrange the chunks of code in an order that will make the program compile and work without error.

1. D
2. A
3. B
4. C

Match each line of code to the proper coding concept.

Concatenation

Loop

Output

Procedure

1. B
2. C
3. D
4. A

What indicated string concatenation?

\+

What is the advantage of using the code chunk A?

This definition simplifies the program logic and maintenance

Software Development Process

1. Investigate
2. Plan
3. Design
4. Create & Test
5. Evaluate the Solution
6. Document & Present

Python Operators by Order of Operators

1st: Exponential \*\*

2nd: Multiplication/division/modulo \*,/,%

3rd: Addition/Subtraction +,-

4th: Relational ==, !=, >, >+=,

Which of the following would most benefit from an inline comment?

Line 7

What allows a programmer to create new abstractions through encapsulation?

Create functions

Output

print (item)

If statement

If not item:

Boolean code

while True:

Assignment Statement

GroceryItems=\[\]

Adding to a List

GroceryItems.append (item)

Which approach explains how the consultant’s trend data can best provide the city’s police force with flexibility and on-demand readiness in combating the recent rise in crime?

Provide police access to crime-trend data through mobile apps