##### help with math fuctions

# I have problem to understand this question:

math_funcs

Complete the following functions. You MUST, MUST, MUST add:

- a doc comment in the proper location for EACH function that describes

the basic purpose of the function. - AT LEAST 5 doc test comments in EACH function that:
- test that the function does what it is supposed to do
- tests that it does what it's supposed to do with odd inputs
- tests "edge" cases (numbers at, just above, just below min/max, empty strings, etc.)

You MUST, MUST, MUST then test each of your methods by BOTH:

- running the "main.py" script
- running this module directly to run the doc tests

Except as noted, you can implement the functions however you like. And if your grade-school

math's out of date, Google's your friend for formulas (BUT NOT FOR CODE).

CHALLENGE: Use try/except blocks to avoid crashes when passing in unexpected parameters.

## circle_area

RETURN the area of a circle with a radius supplied by the parameter.

Note that you MUST use the "pi" constant from the math module, so

use an import statement. If the radius passed is less than 1 or

greater than 1000, PRINT "ERROR" and RETURN 0.

## sphere_surface_area

RETURN the surface area of a sphere with the supplied radius. Slightly

different error check here: if the radius passed is less than 1 or

greater than 250, PRINT "ERROR" and RETURN 0.

## sphere_volume

RETURN the volume of a sphere with the supplied radius. Again, slightly

different error check here: if the radius passed is less than 1 or

greater than 100, PRINT "ERROR" and RETURN 0.

'''

# IMPORT THAT PI CONSTANT HERE

def circle_area(radius):

def sphere_surface_area(radius):

def sphere_volume(radius):

if **name** == "**main**":

import doctest

doctest.testmod()

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