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This is my code its to calculate book club points earned. i cant see where the error is if any one can help me i would be very gratefull. thank you

def main():

books = getBooks

points = getPoints

printPoints

def getBooks():

books = input("enter the books purchased")

return books

def getPoints(books):

if books <= 0:

points = 0

elif books <= 1:

points = 5

elif books <= 2:

points = 15

elif books <= 3:

points = 30

elif books <= 4:

points =60

return points

def printPoints(books,points):

print ("you bought ,books, you now have ,points,")

main()