Question: Question:
I'm using Python 3.4.3.
While creating my own module, I cut out the common processing of the instance method of the class and make it another instance method, but I want to prevent the latter instance method from being called other than the above instance method (or) I want to see when I look at the code that I only use it for the instance methods mentioned above)
class testclass:
def __init__(self):
pass
def get_power_two(self, number): # 2のnumber乗を返す
answer = 1
for i in range(0, number):
answer = self.twice(answer)
return answer
def twice(self, answer): # get_power_two以外からは呼び出されない
return 2*answer
A = testclass()
print(A.get_power_two(4)) # 16
A.twice(2) # これがエラーになってほしい
In the above code, a part of the process of get_power_two() is cut out to an instance method called twice() , which can be called A.twice(2) . I'd like to make it clear that this method isn't or shouldn't be called by anyone other than a method in the same class. Is there a good way?
Thank you.
Answer: Answer:
Let's name the method _twice .
In Python, add _ to indicate that you don't want it to be used from the outside.
It may be used ignoring it, but that is the responsibility of the user.
There is also a way to add __ , but it is not recommended because it will be too inconvenient.