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Python program to right rotate a list by n
In this article, we will see how to right rotate a list from the given rotation number. A list has comma-separated values (items) between square brackets. Important thing about a list is that the items in a list need not be of the same type
Let’s say the following is our input list −
myList = [5, 20, 34, 67, 89, 94, 98, 110]
The following is the output with n = 4 −
89, 94, 98, 110, 5, 20, 34, 67
Right rotate a list by n using slicing
Here, slicing is used to right rotate a list −
Example
# Create a List myList =[5, 20, 34, 67, 89, 94, 98, 110] print("List before rotation = ",myList) # The value of n for rotation position n = 4 # Rotating the List myList = (myList[len(myList) - n:len(myList)] + myList[0:len(myList) - n]) # Display the Update List after rotation print("Updated List after rotation = ",myList)
Output
List before rotation = [5, 20, 34, 67, 89, 94, 98, 110] Updated List after rotation = [89, 94, 98, 110, 5, 20, 34, 67]
Right Rotate a List by n with if
Here, the if statement is used to right rotate a list −
Example
# Create a List myList =[5, 20, 34, 67, 89, 94, 98, 110] print("List before rotation = ",myList) # The value of n for rotation position n = 4 # Rotating the List if n>len(myList): n = int(n%len(myList)) myList = (myList[-n:] + myList[:-n]) # Display the Update List after rotation print("Updated List after rotation = ",myList)
Output
List before rotation = [5, 20, 34, 67, 89, 94, 98, 110] Updated List after rotation = [89, 94, 98, 110, 5, 20, 34, 67]
Right Rotate a List by n with for loop
Here, the for loop is used to right rotate a list −
Example
# The value of n for rotation position num = 4 # Create a List myList =[5, 20, 34, 67, 89, 94, 98, 110] print("List before rotation = ",myList) newlist = [] for item in range(len(myList) - num, len(myList)): newlist.append(myList[item]) for item in range(0, len(myList) - num): newlist.append(myList[item]) # Display the Update List after rotation print("Updated List after rotation = ",newlist)
Output
List before rotation = [5, 20, 34, 67, 89, 94, 98, 110] Updated List after rotation = [89, 94, 98, 110, 5, 20, 34, 67]
Updated on: 11-Aug-2022
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