Base π²

from math import pi, log, ceil, floor
base = pi ** 2
num = orig = float(input("Number: "))
result = ""
error = float(input("Maximum error %: ")) / 100
power = floor(log(num, base))
while num > orig * error or power >= 0:
    mul = num // (base ** power)
    num -= mul * (base ** power)
    if power == -1:
        result += "."
    result += str(int(mul))
    power -= 1
print(result)
print("Error: %4.1f%%" % (100 * num / orig))