#!/usr/bin/python

maxCalled = 0

minCalled = 0

def max_val(a,b):

'''Returns the maximum of the specified arguments.

Arguments must be numbers'''

global maxCalled

maxCalled = maxCalled + 1

if(a > b):

return a

elif(b > a):

return b

else:

return a

def min_val(a,b):

'''Returns the minimum of the specified arguments.

Arguments must be numbers'''

global minCalled

minCalled = minCalled + 1

if(a < b):

return a

elif(b < a):

return b

else:

return a

def print_usage(init_msg, max_val=True, min_val=True):

global maxCalled, minCalled

print init_msg

if max_val:

print 'functin max_val was called', maxCalled, ' times'

if min_val:

print 'function min_val was called', minCalled, ' times'

print 'Calling function max_val'

print max_val.__doc__

max_val(1,4)

max_val(2,b=1)

max_val(b=4,a=3)

print 'Calling function min_val'

print min_val.__doc__

min_val(1,4)

min_val(2,4)

min_val(4,b=9)

print_usage('The usage of functions min_val and max_val')