Week 3 Assignment (Part 1 - Questions)

Question 1

Which of the following statements about tuples are correct?

Note: There are 3 correct answers to this question.

Tuples are sequences. for loops can therefore be used to access each element of a tuple.

✅

To add an element to a tuple, the method ".append()" can be used.

❌

Tuples are represented by parenthesis ( ). Consequently, the index of the tuples uses parenthesis as well.

❌

The elements of a tuple can be accessed using an index.

✅

The elements within a tuple are ordered, but not necessarily sorted.

✅

Question 2

What is the value of variable a after the following statements have been executed?

3

✅

4

❌

10

❌

1

❌

Question 3

Which of the following statements about dictionaries are correct?

Note: There are 2 correct answers to this question.

Tuples can be used as a key in a dictionary.

✅

It is possible to loop over a dictionary with the for loop.

✅

Lists can be used as a key in a dictionary.

❌

If a key-value pair is added to a dictionary and the key already exists in this dictionary, an error occurs.

❌

The output of the method ".keys()" has the data type list.

❌

Question 4

What is the value of the variable a after the following statements have been executed?

Paul

✅

Error

❌

("Paul", 456)

❌

456

❌

Question 5

Although lists, tuples, and dictionaries are all sequence types, there are a few differences between them. Which of the following statements about these data types is correct?

Note: There are 3 correct answers to this question.

The function "len()" can be used for lists, tuples, and dictionaries.

✅

Elements in lists and tuples are accessed by index, elements in dictionaries are accessed by key.

✅

A well suited combination of lists, tuples, and dictionaries (for example, a list of tuples) makes programs easier to implement.

✅

List and tuples are immutable, dictionaries are not.

❌

According to the recommendation in this unit, there should be just one data type used in a tuple.

❌

Question 6

What is the result of the following statements?

Index Error

❌

Syntax Error: Invalid Syntax

✅

Harry is assigned to variable "a".

❌

Key Error

❌

Question 7

What is the value of variable a after the following statements have been executed?

Index Error

❌

123 : Harry

❌

Key Error

✅

"Harry"

❌

Question 8

What is the value of variable a after the following statements have been executed?

(123 : "Harry")

❌

(123, "Harry)

❌

The variable "a" is undefined, because the program crashes.

❌

The variable "a" is undefined, because the program executes the else-part of the if-statement and the assignment of "a" is not executed (if there has been a value assigned to "a" before, this value is unchanged).

✅

Question 9

Which of the following statements about functions and methods for complex data types are correct?

Note: There are 3 correct answers to this question.

The method ".insert(i, x)" can only be used for lists and tuples but not for dictionaries, because an index is required.

❌

The method ".sort()" cannot be used for tuples, because tuples are immutable.

✅

The function "sorted()" can be used for tuples, as the original tuple is unchanged. The function creates a new list.

✅

If the method .keys() is used for lists, a list of all indices is given back.

❌

The functions "min()", "max()", and "sorted()" can only be used if the relation > is supported between all elements.

✅

Question 10

Which of the following statements about while loops are correct?

Note: There are 3 correct answers to this question.

All while loops require a counter variable.

❌

If the keyword "break" is reached, the loop is not exited directly. It is exited when the end of the conditional statements are reached the next time.

❌

while loops can be stopped by the keyword "break".

✅

A while loop requires at least one statement, which is indented.

✅

You can nest for loops, while loops, and if statements.

✅

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