vaex data

[melody-candy]

tart = datetime(2015,1,1,1,1,1)
end = datetime(2015,12,31,23,59,59)
if I want to do this d['seq'] = d.apply(lambda x: ', '.join(d[(d['username'] == x['username']) & (d['time'] >= start) & (d['time'] <= end)]['action']), axis=1) in vaex data ,how to change it,avoid Error parsing datetime string "2015-01-01-0-0-0" at position 10 problem and apply()arguement problem