What will be the result of the following script? <pre> x = [1, 2, 3, 4] print(x[4]) </pre>

Correct. List index starts from 0, so the last index in current list is 3. We are trying to access index 4, which is out of range.

What will be the result of the following script? <pre> 1 my_list = [1, 2, 3, 4] 2 my_list.append(5) 3 my_list.pop() 4 my_list.pop(1) 5 print(my_list) </pre>

Correct. The method append(5) adds 5 to the end of the list; pop() removes the last element in the list, which is 5; pop(1) removes the element at index 1, which is 2.

What will be the result of the following script? <pre> 1 my_list = ['cat', 'dog', 'fish'] 2 print('cat' in my_list) </pre>

Correct. The ‘in’ keyword is used to check if a value is present in a sequence and return True or False as a result.

What does the following script do? <pre> 1 for i in range(5): 2 print(i) </pre>

Correct. The range() function returns a sequence of numbers, starting from 0 by default (if only one parameter is given), and increments by 1 by default (if only two parameters are given), and ends at a specified number (excluded).

What will the following script do? <pre> 1 x = 0 2 while x <= 5: 3 if x == 4: 4 break 5 print(x) 6 x += 1 </pre>

Correct. Initial value of x is 0, and the loop will keep executing and printing current value of x, and increasing x by 1 until x reaches 4. The “break” keyword will end the while loop immediately.

What will the following script do? <pre> 1 x = 0 2 for x in range(5): 3 if x == 3: 4 continue 5 print(x) </pre>

Correct. The keyword “continue” exits the current iteration of the for loop only. When x equals 3, print(x) won’t be executed only for this time, so 3 is not going to be printed.

What will be the result of the following script? <pre> string = 'pasta' result = '' for i in range(len(string) - 1, -1, -1): result += string[i] print(result) </pre>

Correct. When three parameters are given to range(start, stop, step), the method generates a sequence from start (included) to stop (excluded), and increases the element by step. Here “len(string) - 1” is calculated for the last index in the string; -1 allows the sequence to end right before it, which stops at 0; -1 stands for decreasing the sequence by 1.

What will be the result of the following script? <pre> lst = [] for i in range(2): for j in range(1, 3): lst.append(i * j) print(lst)

Correct. This is a nested loop. For each outer loop, that is each i in the sequence from 0 to 1, it runs the inner loop that is each j in the sequence from 1 to 2, and appends the product of current i and j into the list.