[Python] How do I loop all the way back to the beginning?

print("================")
print("Area Calculator")
print("================")

base = 0
height = 0
length = 0
width = 0
area = 0
pie = 3.14
shape = 0

print("1) Triangle\n2) Rectangle\n3) Square\n4) Circle\n5) Quit")

shape = int(input("Please type the number of the shape you would like to know the area of here: "))

while shape > 4 or shape < 1:
print("Incorrect input")
shape = int(input("Please type the number of the shape you would like to know the area of here: "))
else:
print("continue")

if (shape == 1):
base = int(input("base:"))
height = int(input("Height:"))
area = base * height / 2
print(area)
elif (shape == 2):
length = int(input("Length:"))
width = int(input("Width:"))
area = length * width
print(area)
elif (shape == 3):
side = int(input("Side:"))
area = side **2
print(area)
elif (shape == 4):
radius = int(input("Radius:"))
area = pie * radius **2
print(area)

else:
print("Something went wrong")


I want the user to be able to find the area of another shape after their first.

I know I can do something like this at the end

if not input("play again").lower() == "y":


but not sure how to start it, having a loop inside another loop through me off. Thanks for the help!

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