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Examples :

  Input:  l1 = [10, 20, 30, 40, 50, 60] l2 = [60, 50, 40, 30, 20, 10]  Output:  [10, 20, 30, 10, 30, 50]  Input:  l1 = [15, 9, 10, 56, 23, 78, 5, 4, 9] l2 = [9, 4, 5, 36, 47, 26, 10, 45, 87]  Output:  [6, 5, 5, 20, 23 , 52, 5, 4, 9]

Method 1: A naive approach is to traverse both lists at the same time, and if the item in the first list is larger than the item in the second list, then subtract it, otherwise if the item in the first list is less than the item in the second list, then return the item only in the first list.

# Python code to subtract the first element
# the list is larger than the element in the second list
# otherwise we display the element in the first list .

# Initialize the input list

Input1 = [ 10 , 20 , 30 , 40 , 50 , 60 ]

Input2 = [ 60 , 50 , 40 , 30 , 20 , 10 ]

# Initializing the output list

Output = []


   
  for   i   in   range   (  len   (Input1)):  
   if   Input1 [i] & gt; Input2 [i]: 
   Output.append (Input1 [i]   -   Input2 [i]) 
   else  : 
   Output.append (Input1 [i]) 
   
  print   (  "Original list are:"  )  
  print   (Input1) 
  print   (Input2) 
  
  print   (  "Output list is"  )  
  print   (Outp ut)

Output:

 Original list are: [10, 20, 30, 40, 50, 60] [60, 50, 40, 30, 20, 10] Output list is [10, 20, 30, 10, 30, 50]

Method 2: Using zip () we subtract if the item in the first list is larger than the item in the second list, otherwise we output the item from the first list.

# Python code for subtracting the first element
# the list is bigger than the item in the second list,
# otherwise we display the item in the first list.

# Initialize the input list

Input1 = [ 10 , 20 , 30 , 40 , 50 , 60 ]


  Input2   =   [  60  ,   50  ,   40  ,   30  ,   20  ,   10  ] 
   
  # using zip ()  
  Output   =   [e1   -   e2   if   e1 & gt; e2   else   e1   for   (e1, e2)   in   zip   (Input1, Input2)] 

  
  # Printout  
  print   (  "Original list are:"  ) 
  print   (Input1) 
  print   (Input2) 
  
  print   ( " Output list is " ) 
  print   (Output)

Exit:

 Original list are: [10 , 20, 30, 40, 50, 60] [60, 50, 40, 30, 20, 10] Output list is [10, 20, 30, 10, 30, 50]

Method 3: Using comprehension list.

# Python code to subtract the first element
# the list is larger than the item in the second list,
# otherwise we display the item in the first list.

# Initialize the input list

Input1 = [ 10 , 20 , 30 , 40 , 50 , 60 ]


  Input2   =   [  60  ,   50  ,   40  ,   30  ,   20  ,   10  ] 
  
  # Initialize the output list  
  Output   =   [Input1 [i]   -   Input2 [i]   if   Input1 [i] & gt; Input2 [i] 
   else   Input1 [i]   for   i   in   range   (  len   (Input1))]  
  
  # Printout  
  print   (  "Original list are:"  ) 
  print   (Input1) 
  print   (Input2) 
  
  print   (  "Output list is"  ) 
  print   (Output)

Output:

 Original list are: [10, 20, 30, 40, 50, 60] [60, 50, 40, 30, 20, 10] Output list is [10, 20, 30, 10, 30, 50]

Method 4: Using numpy () to accomplish the above task.






  # Python code to subtract the first element  
  # the list is larger than the element in the second list,  
  # otherwise we display the first list item.  
  
  
  import   numpy as np  

  
  # Initialize the input list  
  Inp ut1   =   np.array ([  10  ,   20  ,   30  ,   40  ,   50  ,   60  ]) 
  Input2   =   np.array ([  60  ,   50  ,   40  ,   30  ,   20  ,   10  ])   
  
  # using NumPy  
  Output   =   np.where (Input1 & gt;   =   Input2, Input1   -   Input2, Input1)  
  
  # Printout  
  print   (  "Original list are:"  ) 
  print   (Input1) 
  print   (Input2) 
  
  print   (  "Output list is"  ) 
  print   (Output)

Output: < / p>

 Original list are: [10 20 30 40 50 60] [60 50 40 30 20 10] Output list is [10 20 30 10 30 50]

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