Deck 2: Data and Expressions

Question 1

In Python, a comma can be used in numerical literal values greater than 999. That is, one thousand can be represented as either 1,000 or 1000 within a Python program.

Answer 1

False

Question 2

In Python, a positive sign may be placed in front of positive numeric values.

Answer 2

True

Question 3

Floating-point values have both a limited range and a limited precision.

Answer 3

True

Question 4

Since any floating-point representation contains only a finite number of digits, what is stored for many floating-point values is only an approximation of the true value.

Question 5

Arithmetic overflow can result from the division of two floating-point values.

Question 6

The format function is only for use with numeric values.

Question 7

There is no practical limit to the size of an integer in Python.

Question 8

You cannot rely on the result of floating-point calculations to be mathematically precise.

Question 9

In Python, string literals may contain quotes as part of its value.

Question 10

The character encoding of the character '2' in Python is 00000010.

Question 11

An escape sequence in Python is a sequence of characters beginning with '\n'.

Question 12

In Python, an empty string may be represented with a pair of matching quotes containing only a single space character.

Question 13

Program lines may be joined by use of the backslash character.

Question 14

In Python, the resulting value from a numeric calculation resulting in arithmetic overflow is

A) 0.0
B) inf
C) 9999999999999999
D) -1

Question 15

In Python, the resulting value from a numeric calculation resulting in arithmetic underflow is

A) 0.0
B) inf
C) 9999999999999999
D) -1

Question 16

In Python, string literals may contain

A) letters
B) digits
C) blanks
D) special Characters
E) all of the above

Question 17

In Python, an empty string is denoted by

A) a pair of single quotes containing one blank space
B) a pair of double quotes containing one blank space
C) a pair of matching single or double quotes with no space between them
D) all of the Above

Question 18

In Python, a string literal can contain

A) single quotes, when the string value is delimited by matching double quotes
B) double quotes, when the string value is delimited by matching single quotes
C) no quotes other than the quotes delimiting the string value
D) both (a) and (b)

Question 19

The number of characters that can be defined in the Unicode character encoding scheme is

A) over 4 billion characters
B) over 4 million characters
C) about 100,000 characters
D) about 1,000 characters

Question 20

What is displayed by the following?
Print(format( '-', '->8 '), 'Hello ')

A) Hello ---
B) --- Hello
C) -------- Hello

Question 21

A backslash (\) at the end of a line of a Python program is used to

A) cause the line and the following line to be considered one program line
B) cause Python to indent the following line appropriately
C) allow for an open quoted string to be continued on the next line

Question 22

Indicate what is displayed by the following print statement, for n = 8.096.
Print('n = ', format(n,'.1f'))

A) 8.0
B) 8.09
C) 8.1
D) 8.096

Question 23

Match the respective data types with their value:

-String

A) 12
B) 12.45
C) 'Hello'

Question 24

Match the respective data types with their value:

-Integer

A) 13
B) 12.46
C) 'Hello'

Question 25

Match the respective data types with their value:

-Float

A) 14
B) 12.47
C) 'Hello'

Question 26

The _____ and _____ characters are used in format specifiers in Python to left or right justify a string in a specified field width.

Question 27

Indicate what is displayed by the following.
tax = .08
print('Your cost: $', format((1 + tax) * 12.99, '.2f''))

Question 28

Indicate the purpose of the backslash character (\) in the following.
numsecs_1900_dob 5 ((year_birth 2 1900) * avg_numsecs_year) 1 \
((month_birth 2 1) * avg_numsecs_month) 1 \
(day_birth * numsecs_day)

Question 29

A variable in Python is an identifier that is assigned a value.

Question 30

When assigning a variable a value, the variable name is placed on the right side of the assignment operator.

Question 31

The following is a valid assignment statement for variable n.
n = n + 1

Question 32

An identifier in Python is a sequence of one or more characters which must begin with a letter or a digit.

Question 33

Identifiers in Python may not contain blank characters.

Question 34

The id function produces a unique number identifying a specific value (object) in memory.

Question 35

All input is returned by the input function as a string type.

Question 36

Python is case sensitive, so a variable Line is different from a variable named line.

Question 37

What is value of variable number after the code has been executed?
$\quad$$\quad$$\quad$$\quad$ Number = 10
$\quad$$\quad$$\quad$$\quad$ Number = number + 1

A) 1
B) 11
C) 10
D) number1

Question 38

What value is assigned to variable n by the following input statement
$\quad$$\quad$$\quad$$\quad$$\quad$ N = int(input('Enter your age: '))

A) a numeric integer value
B) a string value

Question 39

For the following input statement in which the user enters as input 35, what is displayed by the following
Age = input('Enter your age: ')
Print("You are", age//10, "decades old")

A) You are 3 decades old
B) You are 3.5 decades old
C) TypeError: unsupported operand type(s) for //: 'str' and 'int'

Question 40

Assume that variables k and num have both been initialized to 10, which of the following is true?

A) id(k), id(num) and id(10) will each give a different result
B) id(k), id(num) and id(10) will all give the same result
C) id(k) and id(num) will be the same because they are variables, but not id(10) because it is an immutable value
D) It depends on the order k and num were initialized

Question 41

Which of the following is not a valid variable identifier?

A) 88Keys
B) num_credits
C) HeSaidSheSaid
D) Y2K

Question 42

An ______________ is a sequence of one or more characters that must not begin with a digit.

Question 43

An identifier that already has a predefined meaning in Python, and therefore cannot be used as a variable, is known as a _________.

Question 44

Give a Python statement that assigns variable num to the integer value one thousand, two hundred and twenty-four.

Question 45

Assuming the integer variable num has already been assigned a value, give a Python statement incrementing num by 5.

Question 46

An operator is a symbol that represents a particular operation that may be performed on its operands.

Question 47

The - symbol is used as both a unary and a binary operator in Python.

Question 48

A keyword is a predefined identifier in Python.

Question 49

Unary operators are applied to a single operand.

Question 50

The / symbol is an example of a binary operator.

Question 51

Truncated division, denoted by //, truncates the result of a division operation as either an integer or floating-point value, based on the types of operands it is applied to.

Question 52

Which of the following contain the correct arithmetic operators in Python?

A) +, -, *, /, //, **
B) +, -, *, /, div, %
C) +, -, *, /, //, %, **

Question 53

A numeric literal may be an __________ or _________________ value.

Question 54

Numeric literals consist of only the digits 0-9, and optional ________ and _____________.

Question 55

A calculated result too small to be represented is referred to as ______________________.

Question 56

The built-in _________________ function of Python can be used to control the display of both numeric and string values.

Question 57

The default character encoding scheme of Python is _________.

Question 58

Truncating division performed on integer operands is referred to as ___________________.

Question 59

Give the character endoding of the letter 'D' in Python.

Question 60

Subexpressions may not contain subexpressions of their own.

Question 61

The operator precedence of a given programming language does not have to necessarily be the same as in mathematics.

Question 62

Like most programming languages, Python uses static typing when determining a variable's data type.

Question 63

Which one of the following is not an expression?

A) 4 + (3 * k)
B) 4
C) 3 * k
D) *

Question 64

The expression 4 + 3 is in

A) prefix Notation
B) infix Notation
C) postfix Notation

Question 65

Based on its rules of operator precedence, Python would evaluate the expression below to
$\quad$$\quad$$\quad$ 4 + 2 * 5 + 3**2

A) 23
B) 39
C) 29

Question 66

Values can be converted from one data type to another by

A) coercion
B) type conversion
C) type titration
D) both A and B

Question 67

The following expression is an example of
(float) 2 + 4.5

A) type Coercion
B) type Titration
C) type Conversion
D) type Concentration

Question 68

Python built-in functions _____ and _____ can be used to convert a string type to a numeric type.

Question 69

Give two expressions in Python, one using the minus symbol (-) as a unary operator, and one using it as a binary operator.

Question 70

Evaluate the following mathematical expressions as Python would evaluate them.
23 5
24 3
7 // 5
7 / 5
2 ** 3

Question 71

Give a Python statement using type conversion to convert the floating value of variable x = 1.24 to an integer value.