How do I write a high order function that accepts a function (like the ones below) and an integer?

Question

So it is a function that accepts a function and an integer as arguments. Depending on the function argument, digits will either return either the sum or count of the digits of the integer argument.
Example: >>> digits(f,245)
11
>>> digits(g,245)
3
def sum_digits(x):
if x < 10:
return x
else:
all_but_last, last = x // 10, x % 10
return sum_digits(all_but_last) + last

def count_digits(x):
if x < 10:
return 1
else:
return 1 + count_digits(x / 10)

Answer 1

def digits(func, number):
if number < 10:
return func(number)
return digits(func, number//10)+func(number%10)

Answer 2

https://code.sololearn.com/cQHouGI6yrPc/