Python Midterm

John von Neumann is known for the observation that the number of transistors that fit on a computer chip doubles every year

John von Neumann is known for the observation that the number of transistors that fit on a computer chip doubles every year

False

The term hertz can be used to describe a computer's speed.

True

Information in secondary memory is lost if the power is turned off.

False

What components are part of the von Neumann model?

control unit, arithmetic logic unit, memory, input and output

Who developed the Python programming language?

Guido van Rossum

Python is a general-purpose programming language, appropriate for solving problems in many areas of computing.

True

The Python programming language was so named after a snake was discovered in the creator's office.

False

Python 3 is backwards compatible to Python 2.

False

Python embodies elements of which programming paradigm?

Procedural programming

Object-oriented programming

Functional programming

Which of the following is NOT a principle embraced by the Python programming language?

Verbose is better than succinct

Thonny is best described as which of the following?

Integrated Development Environment(IDE)

The output of a Python program run in Thonny appears in the shell window.

True

Thonny displays code using syntax highlighting.

True

Running a program that contains errors will cause the Thonny development environment to terminate.

False

Thonny has a package manager that lets you install and update external Python packages.

True

A Python program must be enclosed in curly braces { } to be executed.

False

Which of the following statements is true??

The print statement is a call to a function.

A Python program must compiled into an executable form before it can be run.

False

What is syntax coloring?

Showing certain elements of program code in different color

What does the term case sensitive mean?

The difference between upper and lowercase letters matter

Why don't we use natural languages (like English) to program a computer?

Natural languages are semantically ambiguous

What is the syntax of a language?

The rule that determine how words and symbols can be combined

In a programming language, a syntactically valid statement has only one meaning.

True

A program that runs without generating a runtime error will produce correct results.

False

Which of the following would cause a syntax error?

Misspelling a keyword

Which of the following would cause a runtime error?

Dividing by zero

Computing the wrong answer is an example of what kind of error?

logic error

Debugging is the process of:

Finding the root cause of an error and fixing it

The code you write is called Python bytecode.

False

To run a Python program, the interpreter combines your code with any library code your program uses.

True

Python bytecode is not associated with any particular type of computer processor.

True

The Python package installer is called pip.

True

A graphical representation of the logic of an algorithm.

flowchart

A step-by-step procedure for solving a problem.

algorithm

The data needed by an algorithm to accomplish its task.

input

The level at which an instruction is expressed.

granularity

A language that humans use to communicate, such as French or English.

natural language

The data produced by an algorithm.

output

A language that is independent of any particular programming language.

pseudocode

What output does the following code produce?

print(‘apple’ , ‘banana’)

apple banana

What output is produced by the following code?

print(15+30)

45

What output does the following code produce?

print('Ready', end=' ')
print('Set', end='')
print('Go')

Ready SetGo

What output is produced by the following code?

print('Jan', 'Feb', 'Mar', sep='-')

Jan-Feb-Mar

What output is produced by the following code?

print('oak', 'elm', 'pine', end='!', sep='#')

oak#elm#pine!

What operator is used to perform string concatenation in Python?

+

What output does the following code produce?

print('Total: ' + 100 + 20)

No output. This line would produce an error. (You cant concatenate a string and an integer)

What issue must be addressed when printing a long character string?

A regular string literal cannot span across multiple lines. (use triple quote)

If a variable called pioneer refers to the string 'Grace Murray Hopper', what is the result of the expression len(pioneer)?

19

If a variable called business refers to the string 'Time Warner', what is the result of the expression business[6]?

‘a’

If a variable called son refers to the string 'Justin', what is the result of the expression son[-3]?

‘t’

You cannot change the contents of Python character string once it has been created.

True

If a variable called jedi refers to the string 'Yoda', what is the result of the expression jedi * 3?

YodaYodaYoda

Python comments begin with a hash mark (#) and extend to the end of the line

True

A comment in a Python program is ignored by the interpreter.

True

A Python comment cannot appear on a line that contains an executable statement.

False

A Python block comment begins with a double slash (//).

False

What is a docstring?

A character string used as a comment in a program.

Python variables that represent integers are NOT object reference variables.

False

In dynamically typed languages, variables are declared to store a specific type of data.

False

Which of the following identifiers follows the convention for naming Python variables?

total_value

Which of the following is NOT a valid Python identifier?

1stPlace

The value of a variable can change throughout a program.

True

Python variables are created using an assignment statement.

True

Suppose the integer variable hours contains a value that represents a number of hours. Which of the following expressions will compute how many 24-hour periods are represented by that value, without worrying about any leftover hours.

hour // 24

If the variable num contains a positive integer, what are the only two possible results of the expression num % 2?

0 and 1

What is the result of the expression 43 % 5?

3

What is the result of the expression 7 // 2?

3

The math module contains a constant that represents the value pi to several digits.

True

The expression x ^ y raises the value x to the power y.

False

If both operands to the remainder operator (%) are positive, a divisor of n will produce a result in the range 1 to n.

False

If either or both operands to the division operator (//) are floating-point values, then the result will be a floating-point value.

True

The value assigned to a variable could be a floating point number.

True

In Python, the assignment statement is also an expression.

False

The value assigned to a variable must be numeric.

False

What value is assigned to the variable num by the following statement if the current value of num is 4?

num = num * 2

8

The assignment operator has higher precedence than the arithmetic operators.

False

The input function will produce an error if the value read is not numeric.

False

The input, int, and float functions are all built-in functions.

True

The input function always returns the read data as a character string.

True

What is text that requests user input called?

prompt

Which of the following does the input function NOT do when it is called?

convert the user input to an integer

What will happen if the variable total has the value 5 when the following code is executed?

if total > 8:
     print('collywobbles')

The word collywobbles is not printed and processing continues

Which value of num will cause the print statement in the following code to be executed?

if num < 15:
    if num + 7 >= 20:
        print('There you go!')

13

3

What output is printed by the following code if it is executed when appetizer is 3 and entree is 12?

if appetizer > 1:
    if entree < 7:
        print('ketchup')
    else:
        print('mustard')
else:
    if appetizer < 0:
        print('mayonnaise')
    else:
        print('relish')

mustard

Which of the following statements is true?

The statements in the body of an if must be indented

Of the options given, what values of the variables height, size, and widthwould cause the following code to set the variable weight to 100?

if height < size:
    weight = 50
    if width < 20:
        print('short')
else:
    if width > 100:
        weight = 100
    println('tall')

height = 15, size = 10, width = 110

An if statement cannot have both an elif and an else clause.

False

The relational operators all return boolean results.

True

The result of a relational operator can be assigned to a variable.

True

The arithmetic operators have a lower precedence than the relational operators.

False

Which of the following is a relational operator?

<=

Which of the following expressions could be used to determine if a is not less than b?

a>=b

In Python, the relational operators can be used to put character strings in alphabetical order.

True

The less than operator (<) should not be used to compare floating point values.

False

A character string can be used as the condition of an if statement.

True

Strings containing non-alphabetic characters cannot be compared using the relational operators.

False

Which of the following conclusions is NOT true when using relational operators to compare character strings?

‘reset’ come before ‘reserve’

Which of the following conclusions is NOT true when using relational operators to compare character strings?

‘fantastic’ comes before ‘Great’

When using relational operators to compare character strings, 'ZEBRA'comes before 'ALLIGATOR'.

False

When using relational operators to compare character strings, 'Music'comes before 'music'.

True