Follow-up #15954: public API for Styler (original) (raw)

As a reminder that we need to address this for 0.20, follow-up for #15954

• Decide on public API entry (the whatsnew in the PR mentions pandas.io.api.Styler, but it is in practice also added to top-level namespace (pandas.Styler), while the API docs still use it as pandas.formats.style.Styler)
• Depending on decision above (which may also depend on API: pandas.api #13634), update docs
• Would it be needed to keep back compat shim at pandas.formats.style.Styler to deprecate? (not sure if many people would already used this object directly instead of through df.style)