Question

Write a (PYTHON) program to find and change all even numbers in a list by adding 2 and all odd numbers

by subtracting 2. ( L=[2, 5, 12, 14, 23, 45] )
​

Answer 1

Answer:

This is the required python program for the question.

L=[2, 5, 12, 14, 23, 45]

print("List Before: ",L)

for i in range(len(L)):

if L[i]%2==0:

L[i]+=2

else:

L[i]-=2

print("List After: ",L)

Algorithm:

1. START.
2. Initialise L=[2, 5, 12, 14, 23, 45]
3. Iterate a loop through the list.
4. Check if the list element is odd or not. If odd, subtract 2 or else, add 2.
5. Display the list.
6. STOP.

See the attachment for output ☑.

Answer 2

$\textsf{\large One-Liner}$

   $\texttt{print(\[[i + 2 if i \% 2 == 0 else i - 2 for i in \[[2, 5, 12, 23, 45\]]\]])}$

$\textsf{\large Detailed}$

   $\texttt{original\_list, modified\_list = \[[2, 5, 12, 23, 45\]], \[[\]]}\\\texttt{for element in original\_list:}\\\texttt{\hspace{1em} if element \% 2 == 0:}\\\texttt{\hspace{2em} modified\_list.append(element + 2)}\\\texttt{\hspace{1em} else:}\\\texttt{\hspace{2em} modified\_list.append(element - 2)}\\\texttt{print(modified\_list)}$