eg_1.py

#!/usr/bin/env python
import math
from math import radius
from math import radians

e = math.exp(1.0)
height = radius * math.sin(radians)


# def area(radius):
#    temp = math.pi * radius ** 2
#    return temp


# a more concise version
def area(radius):
    return math.pi * radius ** 2


# temporary variables like temp make debugging easier
#def absolute_value(x):
#    if x < 0:
#        return -x
#    else:
#        return x


# Since these return statement are in an alternative
# conditional, only one will be executed.
# It is a good idea to ensure that every possible path
# through the program hits a return statement.
def absolute_value(x):
    if x < 0:
        return -x
    if x > 0:
        return x