Converting cubic cm to litres in python -

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i want write function when input dimensions of truncated cone (a cup) , amount of liquid in litres returns how many of these cups can filled amount of liquid.

def number_of_cups(bottom_radius, top_radius, height, litres_of_liquid):      volume = math.pi / 3 * height * (bottom_radius**2 + top_radius * bottom_radius +  top_radius**2)      return int(filled_cup)

this far have got, don't understand how convert volume in cm^3 litres using python. how incorporate conversion of 1l = 1000 code

i running python 3 clear version confusion.

any obliged.

there 1000 cubic centimeters in liter, divide 1000.


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