print ' '.join(['%.2X' % ord(x) for x in data])

>>> with open('X.dat', 'rb') as f:
...     byte = f.read(1)
...     while byte:
...         print hex(ord(byte))
...         byte = f.read(1)
...         
...     
... 
0x80
0x2
0x4b
0x2
0x7d
0x71
0x1
0x86
0x2e

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    print ' '.join(['%.2X' % ord(x) for x in data])
NameError: name 'data' is not defined

with open('filename.dat', 'rb') as f:
    data = f.read()
print ' '.join(['%.2X' % ord(x) for x in data])

>>> import Pickle
Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    import Pickle
ImportError: No module named Pickle