Why `a: 2` is not raising a syntax exception in python
Question:
As per title, does anybody know why the python interpreter is not raising exception on the expression
$ python3
Python 3.10.6 (main, May 29 2023, 11:10:38) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a : 2
>>>
?
I’d expect a syntax error
Answers:
Python interprets
a : 2
as a variable annotation (see PEP 526).
Annotations can be used by code analysis tools such as type checkers.
You can access annotations of all variables via module attribute __annotations__
For instance in the code interpreter you’d get
>>> a : 2
>>> __annotations__
{'a': 2}
As per title, does anybody know why the python interpreter is not raising exception on the expression
$ python3
Python 3.10.6 (main, May 29 2023, 11:10:38) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a : 2
>>>
?
I’d expect a syntax error
Python interprets
a : 2
as a variable annotation (see PEP 526).
Annotations can be used by code analysis tools such as type checkers.
You can access annotations of all variables via module attribute __annotations__
For instance in the code interpreter you’d get
>>> a : 2
>>> __annotations__
{'a': 2}