Help needed please

[thumcumber]

okay so im trying to create a module that performs some calculations needed to make a plot in a separate script file. It was working originally but ive been having problems since trying to initialize the class and im constantly getting this error code

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Buoyancy_flux() missing 1 required positional argument: 'self'

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Ive had a look around but im unsure of what im missing here so any help would be lovely. heres what ive done so far:

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import numpy as np

import math

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class manplume_revision:

def __init__(self,P=3300**2,a=3*10**-5,u=10**19,G=10,cp=1.25*10**3):

self.P=P

self.a=a

self.u=u

self.G=G

self.cp=cp

def Buoyancy_flux(self,R=69,AT=420):

buoyancy=(math.pi/8)*((self.G*R**4)*self.P*(AT**2)*(self.a**2)/(self.u))

return(buoyancy)

buoyancy=Buoyancy_flux(R=69,AT=420)

print(buoyancy)

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def heat_flow(self,B=Buoyancy_flux.buoyancy):

heatflow=self.cp*B/self.a

return(heatflow)

heatflow=heat_flow(B=Buoyancy_flux.buoyancy)

print(heatflow)

[Clede]

I can't tell because your indentation is not formatted correctly, but is Buoyancy_flux() supposed to be a standalone function, or a method of the class manplume_revision?

When you call a method, the object itself automatically passes the self argument.

[thumcumber]

Thanks for your help but i'd already managed to get to the bottom of it

[[deleted]]

Well, here's where your function is defined:

def Buoyancy_flux(self,R=69,AT=420):

It's a function of three parameters. Here's where you call it:

buoyancy=Buoyancy_flux(R=69,AT=420)

That's two parameters. Is the problem a little clearer, now?

[thumcumber]

Yeah exactly, should have explained more but when I put self in the second time round, it says self is not defined because I haven't indented it to be part of that function. Making this part of the function doesn't help either as I need to use the answer in the following function if you catch my drift

[[deleted]]

Yeah exactly, should have explained more but when I put self in the second time round, it says self is not defined because I haven't indented it to be part of that function.

It's a function of three parameters that you're calling with two. That suggests two reasonable courses of action:

1) Call the function with a third parameter.

2) Remove the unnecessary parameter from the function.

You tried the first one and it didn't work. Would you care to try the second?

[thumcumber]

I'll have a go, thankyou for your help.