学步园

In [63]: f.tell()
Out[63]: 1048611

In [64]:
In [64]:
In [64]: f.seek(3,2)
---------------------------------------------------------------------------
UnsupportedOperation                      Traceback (most recent call last)
<ipython-input-64-aa18fa7b01a3> in <module>()
----> 1 f.seek(3,2)

UnsupportedOperation: can't do nonzero end-relative seeks

待后续有时间再解决。