如何計算功率？

Question

def is_power_of(number, base):
  # Base case: when number is smaller than base.
  if number < base:
    # If number is equal to 1, it's a power (base**0).
    return True

  # Recursive case: keep dividing number by base.
  return is_power_of(number/base , base)

print(is_power_of(8,2)) # Should be True
print(is_power_of(64,4)) # Should be True
print(is_power_of(70,10)) # Should be False

我唯一改變的是True和number/base, base 。 我不知道如何使True對於除.=1 之外的所有情況都是正確的。

Answer 1

由於歸結為number == 1與否，您可以直接返回該bool ：

def is_power_of(number, base):
  # Base case: when number is smaller than base.
  if number < base:
    # If number is equal to 1, it's a power (base**0).
    return number == 1

  # Recursive case: keep dividing number by base.
  return is_power_of(number/base , base)

您的測試的輸出是：

True
True
False

這是預期的。