Function as a returned value, Python

Question

I am to return a function such that:

add1 = make_adder(1)
add1(5)
#Result: 6

make_adder(5)(10)
#Result: 15

I currently have

def make_adder(n):

    return lambda n: n+1

add1 = make_adder(1)

** Mistake noted!!*

BUT I have another similiar question where I need to check where the numbers match each other.

def is_same(x,y): 
    return x == y 

def make_verifier(key): 
    return lambda n: is_same(262010771,key ) 
check_password = make_verifier(262010771)

If the key is having a different number, I am supposed to get a False, but I do not get where it is wrong

You should make another question, because you already have an accepted answer for this one. — warvariuc
– warvariuc, Commented Feb 7, 2014 at 11:14

icedtrees · Accepted Answer · 2014-02-07 09:48:50Z

4

I think what you want is:

def make_adder(n):
    return lambda x: n + x

As far as I can see, make_adder(n) should return a function that adds n to something that calls it. But what you have done is return lambda n: n+1, which is a function that adds 1 to something that calls it.

More explanation: In the first example, add1 or make_adder(1) is a function that adds 1 to a value passed in. In the second example: make_adder(5) is a function by itself (which adds 5), and 10 is passed into this function to give 5 + 10.

make_adder by itself is a function that creates a function that adds n to a value passed in.

edited Feb 7, 2014 at 9:48

answered Feb 7, 2014 at 9:43

icedtrees

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Comments

warvariuc · Accepted Answer · 2014-02-07 09:50:08Z

1

Python 2.7.5+ (default, Sep 19 2013, 13:48:49) 
>>> class Adder(int):
...     def __call__(self, number):
...             return self.__class__(self + number)
... 
>>> Adder(5)(10)
15
>>> Adder(5)(10)(15)
30
>>>

answered Feb 7, 2014 at 9:50

warvariuc

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Comments

Wolf · Accepted Answer · 2016-02-06 18:15:16Z

0

def is_same(x,y): 
    return x == y 

def make_verifier(key): 
    return lambda n: is_same(n,key) 
check_password = make_verifier(262010771)

Instead of putting in the number 262010771, you should put n to allow the flexibility to change n later in check_password(262010771), if not it'll be fixed and always be True.

edited Feb 6, 2016 at 18:15

Wolf

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answered Feb 6, 2016 at 18:03

Guest 123571113

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