bpo-45292: [PEP-654] add except* (GH-29581)

1 files changed, 100 insertions, 0 deletions

diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index fc3c62954a..6286529d27 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -955,6 +955,48 @@ Custom error messages for try blocks that are not followed by except/finally
    Traceback (most recent call last):
    SyntaxError: expected 'except' or 'finally' block
 
+Custom error message for try block mixing except and except*
+
+   >>> try:
+   ...    pass
+   ... except TypeError:
+   ...    pass
+   ... except* ValueError:
+   ...    pass
+   Traceback (most recent call last):
+   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'
+
+   >>> try:
+   ...    pass
+   ... except* TypeError:
+   ...    pass
+   ... except ValueError:
+   ...    pass
+   Traceback (most recent call last):
+   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'
+
+   >>> try:
+   ...    pass
+   ... except TypeError:
+   ...    pass
+   ... except TypeError:
+   ...    pass
+   ... except* ValueError:
+   ...    pass
+   Traceback (most recent call last):
+   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'
+
+   >>> try:
+   ...    pass
+   ... except* TypeError:
+   ...    pass
+   ... except* TypeError:
+   ...    pass
+   ... except ValueError:
+   ...    pass
+   Traceback (most recent call last):
+   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'
+
 Ensure that early = are not matched by the parser as invalid comparisons
    >>> f(2, 4, x=34); 1 $ 2
    Traceback (most recent call last):
@@ -1070,6 +1112,13 @@ Specialized indentation errors:
 
    >>> try:
    ...     something()
+   ... except* A:
+   ... pass
+   Traceback (most recent call last):
+   IndentationError: expected an indented block after 'except*' statement on line 3
+
+   >>> try:
+   ...     something()
    ... except A:
    ...     pass
    ... finally:
@@ -1077,6 +1126,15 @@ Specialized indentation errors:
    Traceback (most recent call last):
    IndentationError: expected an indented block after 'finally' statement on line 5
 
+   >>> try:
+   ...     something()
+   ... except* A:
+   ...     pass
+   ... finally:
+   ... pass
+   Traceback (most recent call last):
+   IndentationError: expected an indented block after 'finally' statement on line 5
+
    >>> with A:
    ... pass
    Traceback (most recent call last):
@@ -1180,6 +1238,48 @@ raise a custom exception
    SyntaxError: multiple exception types must be parenthesized
 
 
+   >>> try:
+   ...   pass
+   ... except* A, B:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: multiple exception types must be parenthesized
+
+   >>> try:
+   ...   pass
+   ... except* A, B, C:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: multiple exception types must be parenthesized
+
+   >>> try:
+   ...   pass
+   ... except* A, B, C as blech:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: multiple exception types must be parenthesized
+
+   >>> try:
+   ...   pass
+   ... except* A, B, C as blech:
+   ...   pass
+   ... finally:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: multiple exception types must be parenthesized
+
+Custom exception for 'except*' without an exception type
+
+   >>> try:
+   ...   pass
+   ... except* A as a:
+   ...   pass
+   ... except*:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: expected one or more exception types
+
+
 >>> f(a=23, a=234)
 Traceback (most recent call last):
    ...