M-Labs/nac3-spec
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notes about optional parameter value

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pca006132 2020-12-16 16:04:42 +08:00 committed by pca006132
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@ -51,6 +51,17 @@ class Foo(EnvExperiment):
* No implicit coercion, require implicit cast. Integers are int32 by default, * No implicit coercion, require implicit cast. Integers are int32 by default,
floating point numbers are double by default. floating point numbers are double by default.
* RPCs: optional parameter type signature, require return type signature. * RPCs: optional parameter type signature, require return type signature.
* Value of the optional parameter would be created by the caller, and
independent between different invokations. The following code would always
output 2 `1`, instead of `1` and `2` for actual Python:
```py
def test(a = [1]):
print(a)
a[0] += 1
test()
test()
```
## Generics ## Generics
We use [type variable](https://docs.python.org/3/library/typing.html#typing.TypeVar) for denoting generics. We use [type variable](https://docs.python.org/3/library/typing.html#typing.TypeVar) for denoting generics.