# Source code for pm4py.objects.log.util.move_attrs_to_trace

```
'''
This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
PM4Py is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PM4Py is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PM4Py. If not, see <https://www.gnu.org/licenses/>.
'''
from pm4py.objects.log.obj import EventLog, XESExtension
from typing import Optional, Dict, Any, Union
from enum import Enum
from pm4py.util import exec_utils
from copy import deepcopy
[docs]def apply(log: EventLog, parameters: Optional[Dict[Union[str, Parameters], Any]] = None) -> EventLog:
"""
Moves the attributes that are constant for all the events of the trace, and they
do not belong to a standard extension, to the trace level
Parameters
----------------
log
Event log
parameters
Parameters of the algorithm, including:
- Parameters.DEEPCOPY => enables the deepcopy of the event log
Returns
----------------
log
Event log, where some attribute has been possibly moved from the event to the trace level
"""
if parameters is None:
parameters = {}
enable_deepcopy = exec_utils.get_param_value(Parameters.ENABLE_DEEPCOPY, parameters, False)
if enable_deepcopy:
log = deepcopy(log)
main_extensions = set()
for e in XESExtension:
main_extensions.add(e.value[1])
candidates = None
for trace in log:
values_count = {}
for eve in trace:
for attr in eve:
if attr.split(":")[0] not in main_extensions:
if attr not in trace.attributes:
if attr not in values_count:
values_count[attr] = [eve[attr]]
else:
values_count[attr].append(eve[attr])
trace_candidates = set(x for x in values_count if len(values_count[x]) == len(trace) and len(set(values_count[x])) == 1)
if candidates is not None:
candidates = trace_candidates.intersection(candidates)
else:
candidates = trace_candidates
for attr in candidates:
for trace in log:
trace.attributes[attr] = trace[0][attr]
for ev in trace:
del ev[attr]
return log
```