Disable argument abbreviation in Python (#34934)

* Disable argument abbreviation in Python

* Grammar

Co-authored-by: tvalentyn <[email protected]>

---------

Co-authored-by: tvalentyn <[email protected]>

Author: damccorm

CHANGES.md

@@ -85,6 +85,7 @@
 * X behavior was changed ([#X](https://github.com/apache/beam/issues/X)).
 * Yapf version upgraded to 0.43.0 for formatting (Python) ([#34801](https://github.com/apache/beam/pull/34801/)).
 * Python: Added JupyterLab 4.x extension compatibility for enhanced notebook integration ([#34495](https://github.com/apache/beam/pull/34495)).
+* Python: Argument abbreviation is no longer enabled within Beam. If you previously abbreviated arguments (e.g. `--r` for `--runner`), you will now need to specify the whole argument ([#34934](https://github.com/apache/beam/pull/34934)).
 
 ## Deprecations
 

sdks/python/apache_beam/options/pipeline_options.py

@@ -296,7 +296,7 @@ def __init__(self, flags: Optional[Sequence[str]] = None, **kwargs) -> None:
 
     # Build parser that will parse options recognized by the [sub]class of
     # PipelineOptions whose object is being instantiated.
-    parser = _BeamArgumentParser()
+    parser = _BeamArgumentParser(allow_abbrev=False)
     for cls in type(self).mro():
       if cls == PipelineOptions:
         break
@@ -411,7 +411,7 @@ def get_all_options(
     # sub-classes in the main session might be repeated. Pick last unique
     # instance of each subclass to avoid conflicts.
     subset = {}
-    parser = _BeamArgumentParser()
+    parser = _BeamArgumentParser(allow_abbrev=False)
     for cls in PipelineOptions.__subclasses__():
       subset[str(cls)] = cls
     for cls in subset.values():