Question

Write the function powersOf3ToN(n) that takes a possibly-negative float or int n, and returns a list of the positive powers of 3 up to and including n. As an example, powersOf3ToN(10.5) returns [1, 3, 9]. If no such powers of 3 exist, you should return the empty list. You may not use loops/iteration in this problem.

Answer 1

Answer:

def powersOf3ToN(n):

   try:

       num = int(round(n))

   except (ValueError, NameError, TypeError):

       print("Parameter of the function must be integer or float")

       quit()

   num_list = range(num)

   val_list = [pow(3,x) for x in num_list if pow(3,x) in num_list]

   print(val_list)

powersOf3ToN(30)

Explanation:

The python code prints out a list of integer numbers that are equivalent to the power of three. The function accepts integer and floating numbers but not strings or it prints an error message and quits the program.