[Python] How to put an input check for a calculator in python? [duplicate]

print("Welcome to the Kinetic Energy and Gravitational Potential Energy Calculator")
print("Which Calculator would you like to access?")

Choice = str(input("Type in KE for Kinetic Energy and GPE for Gravitational Potential Energy:"))

while Choice != "KE" or "GPE":
print("Error. You have not entered a valid choice. Please type KE or GPE.")
Choice = str(input("Type in KE for Kinetic Energy and GPE for Gravitational Potential Energy:"))


while Choice == "KE":
print("You have chosen the Kinetic Energy Calculator.")
mass = float(input("Type in the mass of the object in kilograms (kg):"))
velocity = float(input("Type in the velocity of the object in metres per second (m/s):"))
result = 0.5*mass*(velocity**2)
print("The KE is:", result, "J(Joules)")
Choice = str(input("Type in KE for Kinetic Energy and GPE for Gravitational Potential Energy:"))

while Choice == "GPE":
print("You have chosen the Gravitational Potential Energy Calculator.")
mass = float(input("Type in the mass of the object in kilograms (kg):"))
height = float(input("Type in the height at which the object is in metres (m):"))
result = 9.81*mass*height
print("The GPE is:", result, "J(Joules)")
Choice = str(input("Type in KE for Kinetic Energy and GPE for Gravitational Potential Energy:"))


I have tried using "or" so the check can include both 'KE' and 'GPE', but when you run the program, even if I input KE or GPE, the first while loop keeps going! How can I make it work?

Continue reading...