how to make the result with type "float" in python ?

Question

i typed a small function in python and the code is

def perimeter(side1,side2,side3):
    ''' (number,number,number)->float
    return the sum of side1,side2 and side3
    >>>perimeter(1,2,3)
     6.0
    >>>perimeter(4,5,7.1)
    16.1 '''

    result = side1+side2+side3
    return result

but when i used it , the result was not on the shape of float , it was like the int . how can i make it in float sort ?

( i don't know how to form a the code window here so forgive me )

to get an accurate floating point sum: perimeter = lambda *sides: math.fsum(sides) — jfs
– jfs, Commented Apr 7, 2013 at 2:35

marcadian · Accepted Answer · 2013-04-07 02:33:17Z

3

typecast to float

def perimeter(side1, side2, side3):
    return float(side1 + side2 + side3)

answered Apr 7, 2013 at 2:33

marcadian

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Comments

Mark Ransom · Accepted Answer · 2013-04-07 02:32:33Z

2

Adding integers will produce an integer. You can convert one or all of them to float, or convert the result to float:

return float(result)

answered Apr 7, 2013 at 2:32

Mark Ransom

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Comments

erdekhayser · Accepted Answer · 2013-04-07 02:38:12Z

1

Maybe if his error is still happening after return float(side1 + side2 + side3), then he has to specify in the parameters that the sides are floats. def perimeter(float(side1),float(side2),float(side3)): Maybe that will work if nothing else is.

answered Apr 7, 2013 at 2:38

erdekhayser

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4 Comments

DSM Over a year ago

That's not syntactically valid.

erdekhayser Over a year ago

It isn't? It just states the type that it is. Only if you pass a character it isn't valid.

DSM Over a year ago

Simply try it at the console. You can't do def f(float(x)): pass. Where did you see this used?

erdekhayser Over a year ago

That's weird... maybe I am getting too used to Java and C++. My bad

bobrobbob · Accepted Answer · 2013-04-07 02:40:39Z

1

If you want the same precision for every result try formatting

 return '%.3f' % result

answered Apr 7, 2013 at 2:40

bobrobbob

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1 Comment

heltonbiker Over a year ago

This returns a string, not a number

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