如何定义一个函数以返回两个函数的和？

Question

I am working on a Python lesson about functions. I created a simple square root function:

def sqrt(x):
     return x ** 0.5

print(sqrt(9))

Now, I wanted to create a function which can call sqrt (as a parameter) twice:

def add_function(func, x):
    return((func, x) + (func, x))

    print(add_function(sqrt, 9))

However, this gets a syntax error. In my mind, the add_function should return the sqrt function with the argument 9 added to the same.

I am looking for a some enlightenment.

Answer 1

I suspect this is what you want: use the func variable to call whatever function is passed in.

def sqrt(x):
     return x ** 0.5

def add_function(func, x):
    return func(x) + func(x)

print(sqrt(9))
print(add_function(sqrt, 9))

Output:

3.0
6.0