# Bruce Maxwell
# Fall 2010
#
# Example of scoping Python
#

topA = 1
midA = 2
botA = 3

print 'topA at top level: ', topA
print 'midA at top level: ', midA
print 'botA at top level: ', botA

def top( topA ):

    # all three are local variables in this function

    midA = 12
    botA = 13
    print 'topA in function top: ', topA
    print 'midA in function top: ', midA
    print 'botA in function top: ', botA

    def middle( midA ):

        # topA comes from the top function
        # midA and botA are local variables
        botA = 23

        print 'topA in function middle: ', topA
        print 'midA in function middle: ', midA
        print 'botA in function middle: ', botA
        

        def bottom( botA ):
            # topA comes from the top function
            # midA comes from the middle function
            # botA is a local variable

            print 'topA in function bottom: ', topA
            print 'midA in function bottom: ', midA
            print 'botA in function bottom: ', botA
            

        bottom( 33 )

    middle( 11 )

    print 'topA in function top: ', topA
    print 'midA in function top: ', midA
    print 'botA in function top: ', botA

top( 0 )

# nothing changed at the global level
print 'topA at top level: ', topA
print 'midA at top level: ', midA
print 'botA at top level: ', botA