ENH: read_parquet as a class method

[davetapley]

Feature Type

• Adding new functionality to pandas

• Changing existing functionality in pandas

• Removing existing functionality in pandas

Problem Description

I wish I could use read_parquet on a DataFrame subclass and it would Just Work.

Currently I have to:

class Foo(pd.DataFrame):
    # stuff from
    # https://pandas.pydata.org/pandas-docs/stable/development/extending.html#override-constructor-properties
    ....

df = read_parquet(file)
foo = Foo(df)
foo.attrs = df.attrs
# maybe I missed something else?

Feature Description

A Foo.read_parquet(file) which would return a Foo with attrs and everything else.

Alternative Solutions

As shown in description I can manually copy attrs, but it's not idea.

Additional Context

Related to:

• API: interaction between subclasses (implementing __finalize__) and attrs/flags handling in __finalize__ #37099
• DEPR: attrs #52166

[jbrockmendel]

For the most part we want either pd.function or DataFrame.method, not both.