A couple of thoughts:
Does attrs have anything similar?
Is this just a subset of a more general-purpose idea to have a different
attribute name than the __init__ parameter name?
What should repr show? The __init__ parameter name? Or the attribute
name? I'd guess the __init__ parameter name.
I'm not crazy about adding more uses of runtime type inspection, but I
guess that ship has sailed with InitVar and ClassVar.
Eric
On 8/23/2020 5:36 PM, zachb1996--- via Python-ideas wrote:
I have a proposal for an addition to the dataclasses module that I think would
make it
easier to use private and name mangled variables. One of the benefits of the
dataclass
decorator is that it helps lessen the amount of code when you just need a simple
constructor. A common pattern in python that isn't addressed by the current
implementation is the pattern
```python
class MyClass:
def __init__(self, a: str, b: str):
self._a = a
self.__b = b
```
right now the only straightforward way of doing this with a dataclass is
```python
@dataclass
class MyClass:
a: InitVar[str]
b: InitVar[str]
def __post_init__(self, a, b):
self._a = a
self.__b = b
```
My proposal would be to add two types to the dataclasses module, one called
PrivateVar
and one called MangledVar. These would add The above pattern (without the
post_init
) using the syntax,
```python
@dataclass
class MyClass:
a: PrivateVar[str]
b: MangledVar[str]
```
I've already looked into what would need to be added to dataclasses to implement
these and it's just a few lines of code since the class implementation would
be very
similar to InitVar. Is this something that other see the possibility of
being added
to python? (Also, I know name mangling isn't super common but I think it
may as well be added alongside a private variable implementation))
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