Convert int to byte array

iLength # 32 bit integer

data = array.array('B')
data.append( ((iLength>>24)&0xFF) )
data.append( ((iLength>>16)&0xFF) )
data.append( ((iLength>>8)&0xFF) ) 
data.append( ((iLength)&0xFF) ) 
file_out.write( data )

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Ref:http://stackoverflow.com/questions/16887493/write-a-binary-integer-or-string-to-a-file-in-python