Question

Use Python 3.7 to write the following program: Given a list of n numbers, write a function to shift the numbers circularly by some integer k (k < n). The function should take a list, the amount to shift k, and an argument specifying the direction to shift (left or right). Suggestion: use the % operation and also you need a number between 0 inclusive and the length of the list.

Answer 1

Below is the Python code I hope that i have provided sufficient comments for your better understanding Note that I have done proper indentation but this code is automatically left alligned on this interface

def Rotate(lists, k, direction):
   if direction == 0:   #left rotation
      output_list = []
      for item in range(k, len(lists)):
         output_list.append(lists[item]) #add items from index k to end
      for item in range(0, k):
         output_list.append(lists[item]) #add items from index 0 to k-1
      return output_list
   else: #right rotation
      output_list = []
      for item in range(len(lists) - k, len(lists)): #add items from index end-k to end
         output_list.append(lists[item])
      for item in range(0, len(lists) - k): #add items from index 0 to end-k-1
         output_list.append(lists[item])
      return output_list
    
k = 3
lst = [1, 2, 3, 4, 5, 6,7,8,9,10]
print(Rotate(lst, k, 0))
print(Rotate(lst, k, 1))

test.py - C\WindowslSystem32test.py (3.5.0) File Edit Format Run Options Window Help def Rotate (lists, k, direction) if direction-: 0: #left rotation for item in range (k, len (lists)) #add items from index k to end output_list.append (11sts [item]) for item in range (0, k) output_list.append(lists [item]) #add items from index 0 to k-1 return output_list else: #right rotation output_1ist[ for item in range (len(11sts) -k, len (11sts)) : #add items from index end-k to end output_1ist.append (lists[item]) for item in range (0, len (lists) -k): #add items from index 0 to end-k-1 output list . append (1 i sts [item] ) - return output_list 1st[1, 2, 3, 4, 5, 6,7,8,9,10] print (Rotate (lst, k, 0)) print (Rotate (1st, k, 1))

Below is the screenshot of output

Python 3.5.0 Shell File Edit Shell Debug Options Window Help Python 3.5.0 (v3.5.0: 374f501f4567, Sep 13 2015, 02:16:59) [MSC v.1900 32 bit (Intel) on win32 Type "copyright", "credits" or "license )" for more information. [4, 5, 6, 7, 8, 9, 10, 1, 2, 3] [8, 9, 10, 1, 2, 3, 4, 5, 6,7]

I have tried to explain it in very simple language and I hope that i have answered your question satisfactorily.Leave doubts in comment section if any.