The below example shows how to use python to create a union and use it.
from ctypes import *
class barley_amount(Union):
_fields_ = [
("barley_long", c_long),
("barley_int", c_int),
("barley_char", c_char * 8),
]
value = raw_input("Enter the amount of barley to put into the beer vat:")
my_barley = barley_amount(int(value))
print "Barley amount as a long: %ld" % my_barley.barley_long
print "Barley amount as an int: %d" % my_barley.barley_long
print "Barley amount as a char: %s" % my_barley.barley_char
(ref: gray hat python)
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