sum=0
for i in range(100,501):
    if(i%2==0):
        sum=sum+i
print("Sum of number 100 to 500 -", sum)

Explain :
Step 1: Declare a variable which store 0 and name assign sum.
Step 2: Start a loop set range (100,501), Start value-100 and stop value- 500.
Step 3: Set condtion i %2 means number divide by 2 remainder 0 means this number divide by 2.
Step 4: The number divide by 2 is add in varaible sum.
Step 5: print the sum variable value.