BUG: reset_index can reset index name #17067
Description
import pandas as pd assert (pd.DataFrame(index=pd.Index([], name='x')) .reset_index(level=[]).index.name) is NoneThe root of the problem is in pandas.core.common._default_index:
def _default_index(n): from pandas.core.index import RangeIndex return RangeIndex(0, n, name=None)Probably, a new optional argument name can be introduced to _default_index and used in reset_index.