PDEP-8: Inplace methods in pandas (pandas-dev#51466)

Co-authored-by: Joris Van den Bossche <1020496+jorisvandenbossche@users.noreply.github.com>
Co-authored-by: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Co-authored-by: Irv Lustig <irv@princeton.com>
Co-authored-by: Richard Shadrach <rhshadrach@gmail.com>

Author: 5 people