human
Give me a the Python code you requested given the following:
I am working on the file "PwNT Notebook 4.ipynb".
The first task is:
Now we exploit this function-as-object approach to create a Python function called mult_function.  Given a function f_pp(p,e), the function mult_function outputs the multiplicative function which coincides with f_pp on prime powers.  In other words, if f = mult_function(f_pp), then f(p**e) will equal f_pp(p,e).
Can you write Python code for it?
assistant
#Here is the Python code you requested.

def mult_function(f_pp):
    '''
    When a function f_pp(p,e) of two arguments is input,
    this outputs a multiplicative function obtained from f_pp
    via prime decomposition.
    '''
    def f(n):
        D = decompose(n)
        result = 1
        for p in D:
            result = result * f_pp(p, D[p])
        return result
    
    return f