我的程序没有给出正确的输出？

Question

I'm trying to get the absolute value of -2 to appear on python.

   def distance_from_zero(a):

            if type(a) == int or type(a) == float:

                 return abs(a)

            else:

                 return "Nope"

   distance_from_zero(-2)

The programs just says "None". I want it to give me the absolute value of -2 or say "nope" is the number is not an int or float.

Answer 1

slightly a better way,

def distance_from_zero(dist):
    a = 'Nope'
    if isinstance(dist, int) or isinstance(dist, float):
        a = abs(dist)
    return a

Answer 2

Add print to see the output.

def distance_from_zero(a):
    if type(a) == int or type(a) == float:
        return abs(a)
    else:
        return "Nope"

print distance_from_zero(-2)
print distance_from_zero('hi')

Output:

➜  python ./distance.py
2
Nope 

Demo