# recover.py
# Walker M. White (wmw2)
# September 9, 2012
"""Module to show off hwo to recover from an error

You will notice that the functions have been broken up so that
we assign the computation to a variable before returning it.
This is so we can add trace statements to better visualize
the error here."""

def function_1(x,y):
    """Have function_2 do all the work"""
    print 'Starting function_1'
    result = 0 # try-catch is like if-else.  Initialize a var for right scope
    try:
        print 'Starting try'
        result = function_2(x,y)
        print 'Completing try'
    except:
        print 'Starting except'
        result = float('inf')
        print 'Completing except'
    print 'Completing function_1'
    return result

def function_2(x,y):
    """Have function_3 do all the work"""
    print 'Starting function_2'
    result = function_3(x,y)
    print 'Completing function_2'
    return result

def function_3(x,y):
    """Returns: x divided by y"""
    print 'Starting function_3'
    result = x/y
    print 'Completing function_3'
    return result

# Application Code
if __name__ == "__main__":
    print function_1(1,0)
    print '' # blank line
    print function_1(2,2)