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Improve the section with SyntaxError message improvements to the What's New of 3.10 (GH-25428)
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@ -145,7 +145,7 @@ For instance, consider the following code (notice the unclosed '{'):
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previous versions of the interpreter reported confusing places as the location of
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the syntax error:
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.. code-block:: text
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.. code-block:: python
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File "example.py", line 3
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some_other_code = foo()
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@ -154,7 +154,7 @@ the syntax error:
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but in Python3.10 a more informative error is emitted:
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.. code-block:: text
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.. code-block:: python
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File "example.py", line 1
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expected = {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4,
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@ -170,6 +170,95 @@ These improvements are inspired by previous work in the PyPy interpreter.
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(Contributed by Pablo Galindo in :issue:`42864` and Batuhan Taskaya in
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:issue:`40176`.)
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A considerable ammount of new specialized messages for :exc:`SyntaxError` exceptions
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have been incorporated. Some of the most notable ones:
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* Missing ``:`` before blocks:
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.. code-block:: python
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>>> if rocket.position > event_horizon
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File "<stdin>", line 1
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if rocket.position > event_horizon
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^
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SyntaxError: expected ':'
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* Unparenthesised tuples in comprehensions targets:
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.. code-block:: python
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>>> {x,y for x,y in range(100)}
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File "<stdin>", line 1
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{x,y for x,y in range(100)}
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^
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SyntaxError: did you forget parentheses around the comprehension target?
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* Missing commas in collection literals:
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.. code-block:: python
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>>> items = {
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... x: 1,
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... y: 2
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... z: 3,
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File "<stdin>", line 3
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y: 2
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^
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SyntaxError: invalid syntax. Perhaps you forgot a comma?
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* Exception groups without parentheses:
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.. code-block:: python
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>>> try:
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... build_dyson_sphere()
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... except NotEnoughScienceError, NotEnoughResourcesError:
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File "<stdin>", line 3
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except NotEnoughScienceError, NotEnoughResourcesError:
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^
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SyntaxError: exception group must be parenthesized
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* Missing ``:`` and values in dictionary literals:
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.. code-block:: python
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>>> values = {
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... x: 1,
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... y: 2,
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... z:
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... }
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File "<stdin>", line 4
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z:
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^
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SyntaxError: expression expected after dictionary key and ':'
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>>> values = {x:1, y:2, z w:3}
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File "<stdin>", line 1
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values = {x:1, y:2, z w:3}
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^
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SyntaxError: ':' expected after dictionary key
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* Usage of ``=`` instead of ``==`` in comparisons:
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.. code-block:: python
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>>> if rocket.position = event_horizon:
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File "<stdin>", line 1
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if rocket.position = event_horizon:
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^
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SyntaxError: cannot assign to attribute here. Maybe you meant '==' instead of '='?
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* Usage of ``*`` in f-strings:
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.. code-block:: python
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>>> f"Black holes {*all_black_holes} and revelations"
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File "<stdin>", line 1
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(*all_black_holes)
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^
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SyntaxError: f-string: cannot use starred expression here
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AttributeErrors
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~~~~~~~~~~~~~~~
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