Right Answer:
# Step 1
days = ["Monday", "Tuesday", "Wendesday", "Thursday", "Friday"]
# Step 2
days[2] = "Wednesday" # Correcting the typo
# Step 3
print(days) # Output: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
Right Answer:
# Step 1
floats = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8]
# Step 2
print(floats[1:4]) # Output: [2.2, 3.3, 4.4]
# Step 3
print(floats[2:]) # Output: [3.3, 4.4, 5.5, 6.6, 7.7, 8.8]
# Step 4
print(floats[:5]) # Output: [1.1, 2.2, 3.3, 4.4, 5.5]
# Step 5
print(floats[::-1]) # Output: [8.8, 7.7, 6.6, 5.5, 4.4, 3.3, 2.2, 1.1]
Right Answer:
# Step 1
first_list = [0, 1, 2, 3, 4]
# Step 2
copy_list = first_list # This is an assignment, not a true copy
# Step 3
copy_list[-1] = 9 # Modify the last element of copy_list
# Step 4
print(first_list) # Output: [0, 1, 2, 3, 9]
# Step 5 - Explanation
# Both `first_list` and `copy_list` refer to the same list in memory, so changes to one affect the other.
# Step 6 - Correct way to copy the list
copy_list = first_list.copy() # Use the .copy() method for a true copy
# Verifying by modifying copy_list again
copy_list[-1] = 8
print(first_list) # Output: [0, 1, 2, 3, 9] (no change in first_list)
print(copy_list) # Output: [0, 1, 2, 3, 8] (change only in copy_list)
Right Answer:
# Step 1
matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
# Step 2
print(matrix[2][1]) # Output: 8
# Step 3
print(matrix[1]) # Output: [4, 5, 6]
# Step 4
third_column = [row[2] for row in matrix]
print(third_column) # Output: [3, 6, 9]
# Step 5
diagonal = [matrix[i][i] for i in range(len(matrix))]
print(diagonal) # Output: [1, 5, 9]
Right Answer:
# Step 1
months = ("Jan", "Feb", "Mach", "Apr")
# Step 2
# Trying to correct the typo will raise an error as tuples are immutable.
# Step 3 - Explanation
# Tuples are immutable, meaning we cannot change their items directly.
# Step 4
months_list = list(months) # Converting tuple to list
# Step 5
months_list[2] = "March" # Correcting the typo
# Step 6
months = tuple(months_list) # Converting the list back to a tuple
# Step 7
print(months) # Output: ('Jan', 'Feb', 'March', 'Apr')
Right Answer:
# Step 1
fishes = ["catfish", "perch", "cod", "carp"]
# Step 2
print(fishes[-1]) # Output: carp (using negative index)
print(fishes[3]) # Output: carp (using positive index)
# Step 3
fishes[1] = "salmon" # Changing the second element to "salmon"
# Step 4
print(fishes) # Output: ['catfish', 'salmon', 'cod', 'carp']