Python: Rotate a Deque Object specified number (negative) of times

Last update on July 05 2025 07:25:09 (UTC/GMT +8 hours)

14. Rotate a Deque a Specified Number (Negative) of Times

Write a Python program to rotate a deque Object a specified number (negative) of times.

Sample Solution:

Python Code:

# Import the collections module to use the deque data structure
import collections

# Declare an empty deque object named 'dq_object'
dq_object = collections.deque()

# Add elements to the deque from left to right
dq_object.append(2)
dq_object.append(4)
dq_object.append(6)
dq_object.append(8)
dq_object.append(10)

# Print a message to indicate the display of the deque before rotation
print("Deque before rotation:")

# Print the content of 'dq_object'
print(dq_object)

# Rotate the deque once in the negative direction (to the left)
dq_object.rotate(-1)

# Print a message to indicate the display of the deque after 1 negative rotation
print("\nDeque after 1 negative rotation:")

# Print the content of 'dq_object' after one negative rotation
print(dq_object)

# Rotate the deque twice in the negative direction (to the left)
dq_object.rotate(-2)

# Print a message to indicate the display of the deque after 2 negative rotations
print("\nDeque after 2 negative rotations:")

# Print the content of 'dq_object' after two negative rotations
print(dq_object) 

Sample Output:

Deque before rotation:
deque([2, 4, 6, 8, 10])

Deque after 1 negative rotation:
deque([4, 6, 8, 10, 2])

Deque after 2 negative rotations:
deque([8, 10, 2, 4, 6])

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to rotate a deque to the left by one position using a negative rotation value.
• Write a Python program to perform multiple negative rotations on a deque and output the final configuration.
• Write a Python program to use a loop to rotate a deque negatively and print the deque after each rotation.
• Write a Python program to compare negative rotations with positive rotations by normalizing the rotation count.

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