PCEP Practice Exam 3

What will be the output after running the following code?

• func1

  func3

  func3

• func3

  func3

  func1

• func1

  func2

  func3

• func3

  func2

  func1

Answer explanation

Here we are looking at nested functions. The function func1 will call the second function func2 , which in turn calls the third function func3.

What will be the output after running the following code?

• [7, 2]

• [7, 6, 5, 4, 3, 2]

• [7, 3]

• SyntaxError

Answer explanation

The data from the list is accessed in reverse and includes every 5th element starting from the back of the list.

What will be the output after running the following code?

• Yes

• True

• error

• No

Answer explanation

The range function generate a series of numbers within a given range, in this case between 10 and 12, with a step of 2. In the first iteration, i is equal to 10, so 10 % 2 != 1 evaluates to True, hence the program prints No

What will be the output when the following program is run?

• 5,4,'Earth'

• [5,4]

• [5, 4, 'Earth']

• {5,4,'Earth'}

Answer explanation

The list() function will convert the tuple 5,4,"Earth" into a list object.

What is the output of the following code:

• <class 'tuple'>

• <class 'list'><class 'int'>

• <class 'list'>

• error

Answer explanation

The *val declaration means that the functions expects multiple arguments. When calling myprint function, one can pass in any number of arguments. Arguments will be passed to the function as a tuple and printed.

What will the output be after executing this code?

• True True False

• False False True

• False True False

• False False False

Answer explanation

When bool() is provided an empty list, an empty string or the value 0 as an argument, it returns False. The expression will evaluate to True when bool () is given any other value, including negative numbers.

What is the output of the following print statement ?

• False

• True

• SyntaxError

• 10

Answer explanation

The is operator is an identity operator, it checks whether both the operands refer to the same object or not. The p and q have equal values, stored in the same memory location, hence p and q are same. You can use id() function to check if the variables are same: print(id(p)) print(id(q)) which will indicate the same ID for both variables.

What is the output when the following code is executed:

• ['o', 'u']

• ['a', 'e', 'i']

• ['a', 'e', 'i', 'o', 'u', 'a', 'e', 'i', 'o', 'u']

• ['a', 'e', 'i', 'o', 'u']

Answer explanation

The range(-2) does not generate any numbers. Hence, all is assigned the list of vowels, and printed.

What will be the output after running the following code?

• AttributeError

• ['Tuple']

• []

• ['Python']

Answer explanation

This code will produce an error, since tuples are immutable and cannot be changed once created. The pop() method cannot be used on tuples.

What do we need to change in order to fix the following code:

• error as the variable name str is invalid

• None of the above

• Wrap the whole sentence in a single quotes and leave Piper and Pepper in double quotes as is

• Escape the quotes around Piper and Pepper words using the \ character.

Answer explanation

Using double quotes in strings is tricky, as it is required as part of syntax to print the strings by surrounding them in double quotes. Fortunately, in Python we can use single quotes or double quotes. It is important to stay consistent.

The two ways to fix the code are:

str = "Peter \"Piper\" Picked A Peck Of Picked \"Pepper\""

str = 'Peter "Piper" Picked A Peck Of Picked "Pepper"'