Question

Write a function LShift(Arr,n) in Python, which accepts a list Arr of numbers
and n is a numeric value by which all elements of the list are shifted to left.
Sample Input Data of the list
Arr= [ 10,20,30,40,12,11], n=2
Output
Arr = [30,40,12,11,10,20]

Answer 1

Question:

Write a function LShift(Arr,n) in Python, which accepts a list Arr of numbers

and n is a numeric value by which all elements of the list are shifted to left.

Sample Input Data of the list Arr= [ 10,20,30,40,12,11], n=2

Output Arr = [30,40,12,11,10,20]

Solution:

def LShift(Arr,n):

L=len(Arr)

for x in range(0,n):

y=Arr[0]

for i in range(0,L-1):

Arr[i]=Arr[i+1]

Arr[L-1]=y

print(Arr)

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Answer 2

Here's a function in Python that performs a left shift operation on a given list by a given number of positions:

def LShift(Arr, n):

for i in range(n):

Arr.append(Arr.pop(0))

return Arr

Here's how it works:

• Arr is the list that we want to shift to the left, and n is the number of positions by which we want to shift it.
• We use a for loop to iterate n times, since we want to shift the list by n positions.
• Inside the loop, we use the pop method to remove the first element of the list (which will be shifted to the end of the list), and then use the append method to add it to the end of the list.
• After the loop is finished, the shifted list is returned.
• Note that this function modifies the input list in place, so if you don't want to modify the original list, you should make a copy of it before passing it to the function.

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