the expected builtin modules are not present.

This includes a unittest for __get_builtin_constructor() in the face
of such an error.

Issue #6378: Further adjust idle.bat to start associated Python

Issue #6378: Further adjust idle.bat to start associated Python

Also, make sure that test_zlib tests decompress() for overly-large inputs.

Also, make sure that test_zlib tests decompress() for overly-large inputs.

attribute when called without a max_length argument.

attribute when called without a max_length argument.

attribute when called without a max_length argument.

"py-bt-full" and add a smarter "py-bt" command printing a classic Python
traceback.

a smarter "py-bt" command printing a classic Python traceback.