Bug report

Bug description:

In theLib/tabnanny.py module, the exception handling forIndentationError might not be reachable afterSyntaxError is caught and areturn statement is executed.

Seehttps://github.com/python/cpython/blob/main/Lib/tabnanny.py#L108-L114

exceptSyntaxErrorasmsg:errprint("%r: Token Error: %s"% (file,msg))returnexceptIndentationErrorasmsg:errprint("%r: Indentation Error: %s"% (file,msg))return

Why This Happens:
According tohttps://docs.python.org/3/library/exceptions.html#exception-hierarchy , we can learn thatSyntaxError detection range thanIndentationError bigger, Is the inclusion relationship.IndentationError is written afterSyntaxError, which causes the program to never executeIndentationError

How to Fix:
We need to put the more specificIndentationError beforeSyntaxError

Linked PRs

• gh-120495: Fix incorrect exception handling in Tab Nanny #120498
• [3.13] gh-120495: Fix incorrect exception handling in Tab Nanny (GH-120498) #120548
• [3.12] gh-120495: Fix incorrect exception handling in Tab Nanny (GH-120498) #120549