Fix path handling in `pip` line magic (#13052)...
Fix path handling in `pip` line magic (#13052)
* Fix path handling in `pip` line magic
* Remove unused import
* code style fix
* Remove `_get_full_path()` (`sys.executable` is always absolute)
* Quote executable path selectively, leaving whitespaces untouched.
* forgotten join
* reduce shlex usage - remove line split, leave only path quotation