[Tutor] Print result of function doesn't work

[Torbjorn Svensson Diaz]

On 7/21/24 10:24 AM, Alan Gauld via Tutor wrote:
> On 20/07/2024 17:20, Torbjorn Svensson Diaz via Tutor wrote:
>
>> print("What is the length of the first leg of the triangle?")
>> leg1 = input()
> You do know that you can put the prompt inside the input()?
>
> leg1 = input("What is the length of the first leg of the triangle?")

Yes, "3" as leg1 and "4" as leg2.



>
>> print("What is the length of the second leg of the triangle?")
>> leg2 = input()
>>
>> def hypotenuse(leg1, leg2):
>>       legs = leg1**2 + leg2**2
>>       result = math.sqrt(legs)
>>       return result
>>
>> x = hypotenuse
> Here you assign x to the function hypotenuse. But you do not yet call
> the function. Similar in Lisp to doing
>
> (setq x hypotenuse)
>
>
>> print(x)
> So this will print the function object
>
>> When I run it in Thonny it says as follows
>> What is the length of the first leg of the triangle?
>> 3
>> What is the lenght of the second leg of the triangle?
>> 4
>> <function hypotenuse at 0x7fa05d5a1940>
> Just as shown here.
>
>> terminal but when I use interactive mode I have no difficulties.
> Cut n paste your interactive session.
> I suspect the line where you assign x looks different.

 >>> import math

 >>> def hypotenuse(leg1, leg2):
...     legs = leg1**2 + leg2**2
...     result = math.sqrt(legs)
...     return result
...
 >>> hypotenuse(3, 4)
5.0

>> The same program in Scheme is
>>
>> (define (hypotenuse leg1 leg2) (sqrt (+ (expt leg1 2) (expt leg2 2))))
>> (hypotenuse 3 4)
> Notice that you do not assign the result of the function call, so its
> not "the same"

Ok, but the following works as a Scheme script

(define (hypotenuse leg1 leg2) (sqrt (+ (expt leg1 2) (expt leg2 2))))
(display (hypotenuse 3 4))

What I mean is that I get the display to work in Scheme but I don't get 
the print to work in Python.


> Also you are not simply evaluating hypotenuse, that would be
>
> (hypotenuse)
>
> Can you see what's missing?

The parameters of the function? Is that what you mean?


If i write like this

import math

print("What is the length of the first leg of the triangle?")
leg1 = input()

print("What is the length of the second leg of the triangle?")
leg2 = input()

def hypotenuse(leg1, leg2):
     legs = leg1**2 + leg2**2
     result = math.sqrt(legs)
     return result

x = hypotenuse(leg1, leg2)
print(x)


it still doesn't work.