Looi - 8 months ago 19

Python Question

Im trying to make a program which can calculate density, terminal velocity and viscosity.

I've seperated them so that it's easier for a user to understand.

The flow is as follows:

It's pretty simple but when the density() function is called, its meant to calculate denCould someone help? The code is below, and so is the error.

`import sys`

def terminalvelandviscocalc(ms,ds,pa):

import math as m

masssteel=ms

diametersteel=ds

projectarea=pa

termvelo=m.sqrt((2*masssteel*9.81)/(density*projectarea*0.5))

visco=((masssteel*9.8)-((4.0/3.0)*((diametersteel/2)**3)*9.8*density))/(6*m.pi*(diametersteel/2)*termvelo)

print 'The terminal velocity is: %.2f' %termvelo

print 'The viscosity is: %.2f' %visco

return termvelo

return visco

And the error :

`termvelo=m.sqrt((2*masssteel*9.81)/(density*projectarea*0.5))`

TypeError: unsupported operand type(s) for *: 'function' and 'float'

Answer

`density`

is a function, yet in the line `termvelo=m.sqrt((2*masssteel*9.81)/(density*projectarea*0.5))`

you use it as a variable.

You should call it with `()`

, and provide the 3 arguments that it expects (I called them `arg1`

, `arg2`

, `arg3`

. You should use the correct variable names from your code):

`termvelo=m.sqrt((2*masssteel*9.81)/(density(arg1, arg2, arg3)*projectarea*0.5))`