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typedef struct CFMessageBase {
    unsigned long       msg_code;
    unsigned long       size;
    unsigned char       body[1];
} CFMessageBase, *PCFMessageBase;

class CFMessageBase(Structure):
    _fields_ = [
        ('msg_code', c_ulong),
        ('size',     c_ulong),
        ('body',     c_uint8 * 1),
        ]

a = CFMessageBase()

print a.body[1]

Traceback (most recent call last):
  File "C:\Temp\1\test.py", line 14, in <module>
    print a.body[1]
IndexError: invalid index

class CFMessageBase(Structure):
    _fields_ = [
        ('msg_code', c_ulong),
        ('size',     c_ulong),
        ('body',     c_ulong),]

a = CFMessageBase()
body = (c_uint8 * a.size).from_address(a.body)
for i in xrange(a.size): print(body[i])

body = (c_uint8 * a.size).from_address(a.body[0])
print (body)

<__main__.c_ubyte_Array_4 object at 0x00A9A3A0>

print body[0]

body = (c_uint8 * a.size).from_address(a.body[0]) # ???

body = (c_uint8 * a.size).from_address(addressof(a.body))