Write a function that takes base and power as arguments and calculate the sum of all digits of the base to the specified power.
def power_base_sum(base, power):
    return sum([int(i) for i in str(pow(base, power))])
assert power_base_sum(2,100)==115 assert power_base_sum(8,10)==37 assert power_base_sum(8,15)==62 assert power_base_sum(3,3)==9