[Python] Rename all Cython extensions to "private" status with leading underscore

[asfimport]

We can do this after the dust settles with the in-flight patches, but it would be good to have pyarrow._array instead of pyarrow.array. If we need to expose a module "publicly" to the user, it would be better to do it in pure Python (as we've done already with pyarrow._parquet).

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• Arrow 0.3 release (blocks)

_{Note: This issue was originally created as ARROW-751. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
PR: #533

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 533
#533