[Python] Provide a method to select a subset of columns of a Table

[asfimport]

I looked through the open issues and in our API, but didn't directly find something about selecting a subset of columns of a table.

Assume you have a table like:

table = pa.table({'a': [1, 2], 'b': [.1, .2], 'c': ['a', 'b']})

You can select a single column with table.column('a') or table['a'] to get a chunked array. You can add, append, remove and replace columns (with add_column, append_column, remove_column, set_column).
But an easy way to get a subset of the columns (without the manuall removing the ones you don't want one by one) doesn't seem possible.

I would propose something like:

table.select(['a', 'c'])

Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Joris Van den Bossche / @jorisvandenbossche

PRs and other links:

• GitHub Pull Request #7272

_{Note: This issue was originally created as ARROW-8314. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 7272
#7272