Deck 5: Functions

Question 1

In Python, program routines are known as functions.

Answer 1

True

Question 2

A function is a named group of instructions performing some task.

Answer 2

True

Question 3

A function may be called one or more times within a program.

Answer 3

True

Question 4

All functions, when they terminate, return to the point in the program from which they were called.

Question 5

All functions are designed to return a value.

Question 6

Functions can be designed are useful in more than one program.

Question 7

The function header of a function definition indicates how the function is to be called.

Question 8

Functions must contain at least one formal parameter.

Question 9

Actual arguments are the identifiers used when defining a function in Python.

Question 10

As long as a function is defined somewhere in a program, it can be called anywhere within the program.

Question 11

All value-returning functions must have a return statement.

Question 12

Non-value-returning functions are called for their side effect.

Question 13

Any function in Python that does not contain a return statement returns special value None.

Question 14

Calls to value-returning functions in Python are expressions.

Question 15

Calls to non-value-returning functions cannot be used anywhere that a statement is expected.

Question 16

In Python, user-defined functions begin with a function header that starts with the keyword,

A) public
B) void
C) function
D) def
E) There are several keywords that can be used

Question 17

Examine the following Python code:

Which line/lines of code make up the suite (body) of the function?

A) Line 1
B) Line 2
C) Line 3
D) Lines 1 and 2
E) Lines 2 and 3

Question 18

Examine the following Python code:

In Line 1, what is (n1, n2, n3) referred to as?

A) Function headers
B) Actual arguments
C) Parameter list
D) Logging variables
E) None of the above

Question 19

Examine the following Python code:

When calling this function, how many arguments would be passed to it?

A) 3
B) Zero
C) 1
D) 2
E) Any of the above

Question 20

Match the following:

-value passed to a function when called

A) routine
B) function
C) formal parameter
D) actual argument
E) function invocation

Question 21

Match the following:

-A named group of instructions performing some task

A) routine
B) function
C) formal parameter
D) actual argument
E) function invocation

Question 22

Match the following:

-A named group of instructions performing some task

A) routine
B) function
C) formal parameter
D) actual argument
E) function invocation

Question 23

Match the following:

-Python's version of a program routine

A) routine
B) function
C) formal parameter
D) actual argument
E) function invocation

Question 24

Match the following:

-an identifier provided in a function header

A) routine
B) function
C) formal parameter
D) actual argument
E) function invocation

Question 25

Match the following:

-called for its returned value

A) function header
B) function body (suite)
C) value-returning function
D) non-value-returning function
E) return statement

Question 26

Match the following:

-contains the function name and parameter list

A) function header
B) function body (suite)
C) value-returning function
D) non-value-returning function
E) return statement

Question 27

Match the following:

-required in all value-returning functions

A) function header
B) function body (suite)
C) value-returning function
D) non-value-returning function
E) return statement

Question 28

Match the following:

-called for its side effects

A) function header
B) function body (suite)
C) value-returning function
D) non-value-returning function
E) return statement

Question 29

Match the following:

-contains the functions instructions

A) function header
B) function body (suite)
C) value-returning function
D) non-value-returning function
E) return statement

Question 30

A __________ is a named group of instructions performing some task.

Question 31

_____________ is an example of a built-in function in Python.

Question 32

A function is said to be ___________ when it is called.

Question 33

The identifiers in a function meant to receive the arguments passed to it are called _________________________________.

Question 34

The values passed to a function when called are referred to as ___________________.

Question 35

A __________________________ function is called for its returned value.

Question 36

A __________________________ function is called for its side effects.

Question 37

Write the function header only of a function named largest that takes three integer parameters and returns the largest of the three.

Question 38

Using function largest in the previous problems, write Python code that gives an example of its use.

Question 39

Examine the following Python code:
def displayFunction():
print('This program will convert between Fahrenheit and Celsius')
print('Enter (C) to convert to Celsius from Fahrenheit')
print('Enter (F) to convert to Fahrenheit to Celsius')
Write a line of Python code that properly calls function displayFunction.

Question 40

Function calls to value-returning functions can be used anywhere that a function's return value is appropriate.

Question 41

There is a fundamental difference in the way value-returning and non-value-returning functions are called.

Question 42

There can be only one function call in a given expression.

Question 43

The actual arguments within a function call may also be function calls.

Question 44

All functions in Python return a numeric value.

Question 45

Function calls may not be used within a print instruction in Python.

Question 46

Value-returning functions can return more than one value by returning a single tuple containing multiple values.

Question 47

Tuple assignment is a means of copying the values of one tuple to another.

Question 48

In function calls to functions that do not have any arguments, a set of empty parentheses can be optionally provided.

Question 49

The correspondence of actual and formal parameters is determined by the names of the actual arguments passed.

Question 50

Only arguments that are a mutable types can be altered when passed to a function.

Question 51

Whether an argument is mutable or immutable in Python is determined by its type.

Question 52

Keyword arguments are different from positional arguments, in that their name must be the same as the name of the corresponding parameter when calling a function.

Question 53

There can only be one keyword argument used in a given function call.

Question 54

All positional arguments must come before any default arguments in a function definition.

Question 55

A local variable can only be accessed from within the function it is defined in.

Question 56

Each function in Python has its own local scope.

Question 57

The lifetime of local variables is the same as global variables, except that they are only accessible from within the function they are defined in.

Question 58

It is generally considered good practice to use global variables whenever possible.

Question 59

Which of the following is not true?

A) An expression may contain multiple function calls
B) Conditional expressions may contain function calls
C) A function call may appear on the left side of an assignment statement
D) Arguments in a print instruction may contain function calls
E) A function call may contain function calls as arguments

Question 60

Which of the following is not a valid use of function avg?

A) average = avg(num1, num2, num3)
B) result = factor * avg(num1, num2, num3)
C) avg(num1, num2, num3) = (num1 + num2 + num3) / 3
D) print('The average of num1, num2 and num3 is', avg(num1, num2, num3))
E) if avg(num1, num2, num3) > 100:
Print('Average above 100 found')

Question 61

Which of the following is not a valid use of function maxmin?

A) result = maxmin([20, 5, 30, 45, 60, 15])
B) result = maxmin([max(num_list1), max(num_list2)])
C) result = maxmin([max(num_list1), max(num_list2), max(num_list3)])
D) largest, smallest = maxmin(num_list)
E) if maxmin(num_list) > 100:
Print('Largest value above 100')

Question 62

Examine the following Python code:

What will the last line print out?

A) [5, -2, 9, 4, -6, 1]
B) [5, 0, 9, 4, 0, 1]
C) nums_1
D) [19]
E) None of the above

Question 63

Examine the following Python code:

What will Line 6 print out?

A) 5
B) 1
C) 15
D) 9
E) 10

Question 64

Examine the following Python code:

What will Line 9 print out?

A) 0
B) 80
C) 85
D) 5
E) 40

Question 65

Examine the following function header:
Def mortgagePayment(amount, rate, term):
Which of the following calls to function mortgagePayment is invalid in Python?

A) mortgagePayment(350000, 5.5, 30)
B) mortgagePayment(amount=350000, rate=5.5, term=30)
C) mortgagePayment(350000, rate=5.5, term=30)
D) mortgagePayment(350000, term=30, rate=5.5)
E) mortgagePayment(rate=5.5, term=30, 350000)

Question 66

Examine the following function header:
Def mortgagePayment(amount, rate, term=30):
Which of the following calls to function mortgagePayment is invalid in Python?

A) mortgagePayment(350000, 5.5, 30)
B) mortgagePayment(amount=350000, rate=5.5, term=30)
C) mortgagePayment(350000, rate=5.5, term=30)
D) mortgagePayment(rate=5.5, term=30)
E) mortgagePayment(amount=350000, rate=5.5)

Question 67

Which of the following is not true about the scope and lifetime of variables in Python:

A) local variables have local scope
B) global variables have global scope
C) local variables have a longer lifetime than global variables
D) the same identifier name can be used for different local variables of other functions
E) The use of global variables is not good programming practice

Question 68

A value-returning function may return more than one value by returning all the values as a __________.

Question 69

The assignment of multiple variables in the same assignment statement in Python involving a call to a value-returning function is called ______________________________.

Question 70

The correspondence of actual argument and formal parameters in a function call is determined by the __________ of the arguments.

Question 71

Arguments of type list in a function call can be altered as a result the call. Such arguments are said to be
___________________.

Question 72

________________ arguments correspond with the associated parameters in a function call by their position in the arguments passed.

Question 73

________________ arguments correspond with the associated parameters in a function call by their their name.

Question 74

A ___________ argument is one that can be optionally provided.

Question 75

Variables defined within a function have ___________ scope.

Question 76

Variables defined outside of any function have ___________ scope.

Question 77

The period of time for which a variable exists is called its ___________.

Question 78

For a function that takes no arguments, parentheses must still be used when calling it it. Why is this?

Question 79

Examine the following Python code:

The formal parameters in the function definition are ordered num1, num2, but in the function call,
the actual arguments are ordered num2, num1. This is neither a syntactic nor a semantic error. Explain why.

Question 80

Examine the following Python code:

What will the last line print out? Explain how you got this answer.