def t(s, sinceBegin=False):
"""Pretty-print timing information."""
global CTIME, CTIMES
nt = int(time.time())
ntimes = os.times()
if not sinceBegin:
ct = CTIME
cts = CTIMES
else:
ct = BEGIN_TIME
cts = BEGIN_TIMES
print '# TIME', s, \
': %dmin, %dsec (wall) %dmin, %dsec (user) %dmin, %dsec (system)' \
% _minSec(nt-ct, ntimes[0]-cts[0], ntimes[1]-cts[1])
if not sinceBegin:
CTIME = nt
CTIMES = ntimes
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