[Python] Reading binary file in python

I wrote a python script to create a binary file of integers.

import struct
pos = [7623, 3015, 3231, 3829]
inh = open('test.bin', 'wb')
for e in pos:
inh.write(struct.pack('i', e))
inh.close()


It worked well, then I tried to read the 'test.bin' file using the below code.

import struct
inh = open('test.bin', 'rb')
for rec in inh:
pos = struct.unpack('i', rec)
print pos
inh.close()


But it failed with an error message:

Traceback (most recent call last):
File "readbinary.py", line 10, in <module>
pos = struct.unpack('i', rec)
File "/usr/lib/python2.5/struct.py", line 87, in unpack
return o.unpack(s)
struct.error: unpack requires a string argument of length 4


How can I read this file using struct.unpack?

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