How to paas null in bulk action when updating using helpers in python

how to paas null in bulk action when updating using helpers in python , i am passing assing in helpers to update a field as null nut it throws error .
action is as below

actions = [
{
'_op_type': 'update',
'_index': 'index_name',
'_id': 3295137582,
'doc':{
'mp_8012_n_0_32': null,
'mp_8013_n_0_32': 2.5,
'mp_8014_n_0_32': 3.7}
}

       ]

Please take care of proper formatting using markdown as well as providing a full blow example allowing others to reproduce the problem. For example the error message in this case would be crucial. Thank you!

null is not a reserved term for python. It should be only treated as an undefined variable name. The behavior is no wonder.

Have you tried 'null' or None?