How to use a function within a function in python

Question

I want to use the function f in the function radiationExposure, but this code return nothing.

def f(x):
    import math
    return 10*math.e**(math.log(0.5)/5.27*x)


def radiationExposure(start, stop, step):    
    if start < 0 or stop < start or step < 0:
        print("Invalid inputs!")
    else:
        result = 0 # Total radiation exposure area
        for i in range(start, stop + 1):
            result += f(i)*step
        return result


radiationExposure(5, 10, 1)

Don't use local imports, they make it harder to understand your code and are usually only used to break cyclic dependencies (a bad thing to have), or to make conditional imports based e.g. on operating-system or availability of extension modules. No need for you to use them. — deets
– deets, Commented Oct 26, 2014 at 11:48

Martijn Pieters · Accepted Answer · 2014-10-26 11:10:28Z

4

When you run a Python script, it will not auto-echo the result. Your code runs fine, but you need to explicitly print the result:

print(radiationExposure(5, 10, 1))

Your script, when run, will now print 22.9424104106.

answered Oct 26, 2014 at 11:10

Martijn Pieters

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2 Comments

Charles Li Over a year ago

but I thought my radiationExposure function will return a result?

deets Over a year ago

It does return a result. But you are not doing anything with it. You need to print it, as Martijn showed you.

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