Log Message:
Update py-pandas to 0.18.1

Highlights in changelog:

v0.18.1:
    .groupby(...) has been enhanced to provide convenient syntax when working \ 
with .rolling(..), .expanding(..) and .resample(..) per group, see here
    pd.to_datetime() has gained the ability to assemble dates from a DataFrame, \ 
see here
    Method chaining improvements, see here.
    Custom business hour offset, see here.
    Many bug fixes in the handling of sparse, see here
    Expanded the Tutorials section with a feature on modern pandas, courtesy of \ 
@TomAugsburger. (GH13045).

v0.18.0:
    Moving and expanding window functions are now methods on Series and \ 
DataFrame, similar to .groupby, see here.
    Adding support for a RangeIndex as a specialized form of the Int64Index for \ 
memory savings, see here.
    API breaking change to the .resample method to make it more .groupby like, \ 
see here.
    Removal of support for positional indexing with floats, which was deprecated \ 
since 0.14.0. This will now raise a TypeError, see here.
    The .to_xarray() function has been added for compatibility with the xarray \ 
package, see here.
    The read_sas function has been enhanced to read sas7bdat files, see here.
    Addition of the .str.extractall() method, and API changes to the \ 
.str.extract() method and .str.cat() method.
    pd.test() top-level nose test runner is available (GH4327).

Update by K.I.A.Derouiche in PR pkg/51272
Slightly modified.