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f = open('/tmp/x', 'w+')
print f.tell()
f.write('test line 1\n') # add 12-char string [0-11]
print f.tell()
print f.write('test line 2\n') # add 12-char string [12-23]
print f.tell() # tell us current file location (end))
print f.seek(-12, 1) # move back 12 bytes
print f.tell() # to beginning of line 2
print f.readline()
print f.seek(0, 0) # move back to beginning
print f.readline()
print f.tell() # back to line 2 again
print f.readline()
print f.tell() # at the end again
print f.close() # close file
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