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base repository: python/mypy
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  • 4 commits
  • 12 files changed
  • 4 contributors

Commits on Dec 11, 2025

  1. [mypyc] Fix calling async methods through vectorcall (#20393) 

    Fixes mypyc/mypyc#1170

Fixed a bug introduced when adding the async function wrapper in
81eaa5d
that would result in `TypeErrors` being raised when the wrapped function
was called using the vectorcall protocol.

The exception was caused by the wrapper keeping the `self` argument of
methods in the `args` vector instead of extracting it to a separate c
function argument. The called function would not expect the `self`
argument to be part of `args` so it appeared as if too many arguments
were passed.
    @p-sawicki
    p-sawicki authored Dec 11, 2025
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  2. [mypyc] Add primitive for bytes.startswith (#20387) 

    Implements `bytes.startswith` in mypy. Potentially could be more
efficient without relying on `memcmp` but not sure.

Tested with the following benchmark code, which shows a ~6.3x
performance improvement compared to standard Python:

```
import time

def bench(prefix: bytes, a: list[bytes], n: int) -> int:
    i = 0
    for x in range(n):
        for b in a:
            if b.startswith(prefix):
                i += 1
    return i


a = [b"foo", b"barasdfsf", b"foobar", b"ab", b"asrtert", b"sertyeryt"]
n = 5 * 1000 * 1000
prefix = b"foo"

bench(prefix, a, n)

t0 = time.time()
bench(prefix, a, n)
td = time.time() - t0
print(f"{td}s")
```

Output:
```
$ python /tmp/bench.py
1.0015509128570557s
$ python -c 'import bench'
0.154998779296875s
```
    @esarp
    esarp authored Dec 11, 2025
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  3. [mypyc] feat: use get_expr_length_value in translate_len (#20074) 

    Currently, `translate_len` can determine the length of an RTuple at
compile time

This PR extends this capability to all expressions supported by
`get_expr_length_value`

This will constant fold the code example displayed in
mypyc/mypyc#1152 without waiting for the
implementation of #19886 which has a few steps ahead of it

Before:
```python
def extend_and_specialize(items: list[dict[str, Any]]) -> None:
    types: Final[dict[str, Any]] = {i["name"]: i for i in items}
    types.update(
        {
            k[len("https://w3id.org/cwl/salad#") :]: v
            for k, v in types.items()
            if k.startswith("https://w3id.org/cwl/salad#")
        }
    )
```

After:
```python
def extend_and_specialize(items: list[dict[str, Any]]) -> None:
    types: Final[dict[str, Any]] = {i["name"]: i for i in items}
    types.update(
        {
            k[27 : ]: v
            for k, v in types.items()
            if k.startswith("https://w3id.org/cwl/salad#")
        }
    )
```

Even after #19986, this will also work for some situations that constant
folding cannot handle but `get_expr_length` can.
    @BobTheBuidler
    BobTheBuidler authored Dec 11, 2025
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  4. Fix Typo attr -> attrs (#20400) 

    In the example, `attrs` is used, even though `attr` is imported.
Picking either one isn't important, but the code gives a runtime error
when the other one is used.
    @George-Ogden
    George-Ogden authored Dec 11, 2025
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