[Python] Python Value exception [duplicate]

I am a Python learner and just on the Exception module. I wrote this code, need two int input and then calculate sum, otherwise ask the user to re-enter the number which is not valid.

Now, when num1 is not a number, the code can ask the user to re-enter, but when the second is not a number, it come to the top, asking to re-enter the first number, not the second.

flag = True
while flag:
try:
num1 = int(input("Please enter the first number:"))
num2 = int(input("Please enter the second number:"))
except ValueError:
print("Please enter a number")
continue
else:
sum = num1 + num2
flag = False
print(sum)


I expect the code to get the user to re-enter the number (num1 or num2) which the input is invalid.

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