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Eagerly populate the class dict for cudf.pandas proxy types (#14534)
Rather than dynamically looking up class attributes (and methods), this PR makes it so that we eagerly populate the class with all known methods and attributes (by inspecting the "slow" class). This solves a number of problems: - it makes `getattr` trivially inexpensive (no dynamic `__getattr__` for each attribute access) - it ensures the _same_ object is returned every time you do, e.g., `DataFrame.max` - it makes tab completion fast because the attributes don't have to be computed each time - it no longer exposes attributes that are specific to cuDF - for example `Series.list` - it allows subclassing of proxy types to work better. For example, derived types can now call `super().` to access attributes of base types Authors: - Ashwin Srinath (https://github.com/shwina) - GALI PREM SAGAR (https://github.com/galipremsagar) - Matthew Roeschke (https://github.com/mroeschke) - Vyas Ramasubramani (https://github.com/vyasr) Approvers: - Bradley Dice (https://github.com/bdice) - GALI PREM SAGAR (https://github.com/galipremsagar) - Matthew Roeschke (https://github.com/mroeschke) URL: #14534
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