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Eric Traut 2022-05-08 11:12:37 -07:00
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docs/type-concepts.md
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@ -419,7 +419,7 @@ Some functions or methods can return one of several different types. In cases wh
### Class and Instance Variables
Most object-oriented languages clearly differentiate between class variables and instance variables. Python allows an object to overwrite a class variable with an instance variable of the same name.
Most object-oriented languages clearly differentiate between class variables and instance variables. Python is a bit looser in that it allows an object to overwrite a class variable with an instance variable of the same name.
```python
class A:
@ -445,7 +445,7 @@ print(A.my_var) # Updated class variable value of 2
print(a.my_var) # Instance variable value of "hi!"
```
Pyright differentiates between the following three types of variables:
Pyright differentiates between three types of variables: pure class variables, regular class variables, and pure instance variables.
#### Pure Class Variables
If a class variable is declared with a `ClassVar` annotation as described in [PEP 526](https://peps.python.org/pep-0526/#class-and-instance-variable-annotations), it is considered a “pure class variable” and cannot be overwritten by an instance variable of the same name.