[Python] How could I repeat a block of code in scope of a For loop without moving onto the...

I have written a really simple code that functions as a "school register" by asking whether a student is present or not; if something else other than a "yes" or "no" is inputted the code will simply print "invalid input".

I would like to have a "yes" or "no" answer to each register question by repeating the same For loop without moving onto the next person until the "yes" or "no" has been inputted.


students = ["Julio","Jayden","Josh","John","Jamal"]

present = 0
absent = 0
for x in students:
register=input(f"Is {x} present? ")
if register == "yes":
present += 1
elif register == "no":
absent += 1
else:
print("invalid input")
# ^^^^^^ this is where I would want to make the code repeat the For loop again without moving onto the next person on the register
print(f"{present} people are present")
print(f"{absent} people are absent")


I have tried to use a ' while register != "yes" or "no" ' loop but I don't know how could I make the For loop start all over again

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