Answer: Here is an example of a post-test while loop in Python 3 that lets users enter N floating point numbers and then calculates and displays their product:
# Ask the user to enter the value of N
n = int(input("Enter the value of N: "))
# Initialize the product to 1
product = 1
# Initialize the counter
i = 1
# Post-test while loop
while i <= n:
# Ask the user to enter a floating point number
num = float(input("Enter a floating point number: "))
# Multiply the current product by the entered number
product *= num
# Increment the counter
i += 1
# Display the product
print("The product of the numbers is", product)