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Small changes to the section about SyntaxErrors in the 3.10 What's New document (GH-25461)

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Pablo Galindo 2021-04-17 22:41:46 +01:00 • committed by GitHub
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Doc/whatsnew/3.10.rst
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@ -176,90 +176,102 @@ have been incorporated. Some of the most notable ones:
* Missing ``:`` before blocks:
.. code-block:: python
.. code-block:: python
>>> if rocket.position > event_horizon
File "<stdin>", line 1
if rocket.position > event_horizon
^
SyntaxError: expected ':'
>>> if rocket.position > event_horizon
File "<stdin>", line 1
if rocket.position > event_horizon
^
SyntaxError: expected ':'
(Contributed by Pablo Galindo in :issue:`42997`)
* Unparenthesised tuples in comprehensions targets:
.. code-block:: python
.. code-block:: python
>>> {x,y for x,y in range(100)}
File "<stdin>", line 1
{x,y for x,y in range(100)}
^
SyntaxError: did you forget parentheses around the comprehension target?
>>> {x,y for x,y in range(100)}
File "<stdin>", line 1
{x,y for x,y in range(100)}
^
SyntaxError: did you forget parentheses around the comprehension target?
* Missing commas in collection literals:
(Contributed by Pablo Galindo in :issue:`43017`)
.. code-block:: python
* Missing commas in collection literals and between expressions:
>>> items = {
... x: 1,
... y: 2
... z: 3,
File "<stdin>", line 3
y: 2
^
SyntaxError: invalid syntax. Perhaps you forgot a comma?
.. code-block:: python
>>> items = {
... x: 1,
... y: 2
... z: 3,
File "<stdin>", line 3
y: 2
^
SyntaxError: invalid syntax. Perhaps you forgot a comma?
(Contributed by Pablo Galindo in :issue:`43822`)
* Exception groups without parentheses:
.. code-block:: python
.. code-block:: python
>>> try:
... build_dyson_sphere()
... except NotEnoughScienceError, NotEnoughResourcesError:
File "<stdin>", line 3
except NotEnoughScienceError, NotEnoughResourcesError:
^
SyntaxError: exception group must be parenthesized
>>> try:
... build_dyson_sphere()
... except NotEnoughScienceError, NotEnoughResourcesError:
File "<stdin>", line 3
except NotEnoughScienceError, NotEnoughResourcesError:
^
SyntaxError: exception group must be parenthesized
(Contributed by Pablo Galindo in :issue:`43149`)
* Missing ``:`` and values in dictionary literals:
.. code-block:: python
.. code-block:: python
>>> values = {
... x: 1,
... y: 2,
... z:
... }
File "<stdin>", line 4
z:
^
SyntaxError: expression expected after dictionary key and ':'
>>> values = {
... x: 1,
... y: 2,
... z:
... }
File "<stdin>", line 4
z:
^
SyntaxError: expression expected after dictionary key and ':'
>>> values = {x:1, y:2, z w:3}
File "<stdin>", line 1
values = {x:1, y:2, z w:3}
^
SyntaxError: ':' expected after dictionary key
>>> values = {x:1, y:2, z w:3}
File "<stdin>", line 1
values = {x:1, y:2, z w:3}
^
SyntaxError: ':' expected after dictionary key
(Contributed by Pablo Galindo in :issue:`43823`)
* Usage of ``=`` instead of ``==`` in comparisons:
.. code-block:: python
.. code-block:: python
>>> if rocket.position = event_horizon:
File "<stdin>", line 1
if rocket.position = event_horizon:
^
SyntaxError: cannot assign to attribute here. Maybe you meant '==' instead of '='?
>>> if rocket.position = event_horizon:
File "<stdin>", line 1
if rocket.position = event_horizon:
^
SyntaxError: cannot assign to attribute here. Maybe you meant '==' instead of '='?
(Contributed by Pablo Galindo in :issue:`43797`)
* Usage of ``*`` in f-strings:
.. code-block:: python
.. code-block:: python
>>> f"Black holes {*all_black_holes} and revelations"
File "<stdin>", line 1
(*all_black_holes)
^
SyntaxError: f-string: cannot use starred expression here
>>> f"Black holes {*all_black_holes} and revelations"
File "<stdin>", line 1
(*all_black_holes)
^
SyntaxError: f-string: cannot use starred expression here
(Contributed by Pablo Galindo in :issue:`41064`)
AttributeErrors
~~~~~~~~~~~~~~~