hello,
is that OK?
In [1]: from obspy.core import read
In [2]: A = read('test_A.mseed')
In [3]: A[0].stats.starttime.precision
Out[3]: 6
In [4]: A[0].stats.starttime.precision = 5
In [5]: A[0].stats.starttime.precision
Out[5]: 5
In [6]: A.write('test_B.mseed', format='MSEED')
In [7]: B = read('test_B.mseed')
In [8]: B[0].stats.starttime.precision = 5
In [9]: B = read('test_B.mseed')
In [10]: B[0].stats.starttime.precision
Out[10]: 6
Dear Emiliano,
there are multiple issues with the script you attached
1. the used precision will not be stored into the MiniSEED file itself -
AFAIK there is not even a way to to that
2. line 9 completely overwrites variable B, ignoring line 8 and
therefore using the default precision of 6
3. setting a precision on a certain UTCDateTime object will not set the
precision globally
Take a look at
http://docs.obspy.org/packages/autogen/obspy.core.utcdatetime.UTCDateTime.html#precision
(second option) on how to set/unset this for your application on a
global scope (needs trunk as its not released yet).
Precision support is not trivial and has been recently added - I expect
some bugs 
Hope it helps,
Robert
hello,
is that OK?
In [1]: from obspy.core import read
In [2]: A = read('test_A.mseed')
In [3]: A[0].stats.starttime.precision
Out[3]: 6In [4]: A[0].stats.starttime.precision = 5
In [5]: A[0].stats.starttime.precision
Out[5]: 5In [6]: A.write('test_B.mseed', format='MSEED')
In [7]: B = read('test_B.mseed')
In [8]: B[0].stats.starttime.precision = 5
In [9]: B = read('test_B.mseed')
In [10]: B[0].stats.starttime.precision
Out[10]: 6_______________________________________________
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