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Oracle
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df = {'cell_name':
['#_marS_8_all_0M#_[BC]',
'#_marS_8_all_0M#_[BC]',
'Контрольная группа [ВС]',
'#_marS_8_all_0M#_[BC]',
'#_marS_8_all_0M#_[Баннер]']}
print(['#'.join(d.split('#')[:2]) for d in df['cell_name']])