"""Using some of python's built in functions, the math module,
and our celsius to fahrenheit conversion function """

# Most functions have arguments that provide the function data on
# which to work

# Example:  the absolute value function:

print "the absolute value of 5 is", abs(5)
print "the absolute value of -5 is", abs(-5)

# notice that this function RETURNS a value.
# you can reassign that value to a variable:

a = abs(-5)

# some functions take more than one argument:

print pow(2, 3)
# pow is a more flexible version of the exponentiation operator

# the max function returns the maximum number among its arguments
print max(1, 10)
# it can take as many arguments as you want
print max(1, 10, 3)

# let's use the celsius2fahrenheit function we wrote
# to do that we first need to IMPORT the module in which it exists:

import celsius2fahrenheit
# now we can access the function using dot notation
celsius2fahrenheit.celsius2fahrenheit(21)

import math
# the math module is described at
# http://docs.python.org/library/math.html
# it provides all kinds of mathematical functions for example:

# sqrt
print math.sqrt(9)
print math.log10(1000)

# it also includes constants like e and pi
print math.pi
print math.e

# the sys module is a module that provides system specific functions
# and constants. see http://docs.python.org/library/sys.html
import sys
# sys.path is the set of directories where the interpreter 
# looks for modules
print sys.path