forsofintinlist.py

# sum of integers in list
l=eval(input())  # l = [3,4,6,5,7]
sum=0
for num in l:
    if isinstance(num,int): # we can also use if type(num)==int:
        sum+=num 
print(sum)

'''
Step 1: Initialize variables
The input list l = is taken.​​
Initialize sum = 0 to store the running total.
Step 2: Begin the for loop iteration over each element in the list.
Step 3: First iteration (num = 3)
Check if num is an integer using isinstance(num, int) → True.
Add num (3) to sum → sum = 0 + 3 = 3.
Step 4: Second iteration (num = 4)
Check if num is an integer → True.
Add num (4) to sum → sum = 3 + 4 = 7.
Step 5: Third iteration (num = 6)
Check if num is an integer → True.
Add num (6) to sum → sum = 7 + 6 = 13.
Step 6: Fourth iteration (num = 5)
Check if num is an integer → True.
Add num (5) to sum → sum = 13 + 5 = 18.
Step 7: Fifth iteration (num = 7)
Check if num is an integer → True.
Add num (7) to sum → sum = 18 + 7 = 25.
Step 8: End of loop
The loop ends after processing all elements in the list.
Step 9: Print the result
Print the final value of sum → 25.
'''