Improve error messages when positional arguments are missing #20591
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Diff from mypy_primer, showing the effect of this PR on open source code: spark (https://github.com/apache/spark)
+ python/pyspark/streaming/dstream.py:236: error: Unused "type: ignore[arg-type]" comment [unused-ignore]
+ python/pyspark/streaming/dstream.py:410: error: Unused "type: ignore[arg-type]" comment [unused-ignore]
+ python/pyspark/streaming/dstream.py:453: error: Unused "type: ignore[arg-type]" comment [unused-ignore]
prefect (https://github.com/PrefectHQ/prefect)
+ src/prefect/cli/work_pool.py:206: error: Incompatible arguments for "provision"; check for missing arguments [call-arg]
- src/prefect/cli/work_pool.py:206: error: Missing positional argument "self" in call to "provision" of "Provisioner" [call-arg]
- src/prefect/cli/work_pool.py:207: error: Argument "base_job_template" to "provision" of "Provisioner" has incompatible type "dict[str, Any] | None"; expected "dict[str, Any]" [arg-type]
hydra-zen (https://github.com/mit-ll-responsible-ai/hydra-zen)
+ tests/annotations/mypy_checks.py:86: error: Unused "type: ignore[arg-type]" comment [unused-ignore]
ibis (https://github.com/ibis-project/ibis)
- ibis/expr/datatypes/core.py:304: error: Too few arguments for "Array" [call-arg]
+ ibis/expr/datatypes/core.py:304: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/expr/datatypes/core.py:304: error: Argument 1 to "Array" has incompatible type "Int64"; expected "bool" [arg-type]
- ibis/expr/datatypes/core.py:307: error: Too few arguments for "Map" [call-arg]
+ ibis/expr/datatypes/core.py:307: error: Incompatible arguments for "Map"; check for missing arguments [call-arg]
- ibis/expr/datatypes/core.py:307: error: Argument 1 to "Map" has incompatible type "Int64"; expected "bool" [arg-type]
- ibis/expr/datatypes/core.py:968: error: "Struct" gets multiple values for keyword argument "nullable" [misc]
- ibis/expr/datatypes/core.py:968: error: Too few arguments for "Struct" [call-arg]
+ ibis/expr/datatypes/core.py:968: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/expr/datatypes/core.py:968: error: Argument 1 to "Struct" has incompatible type "dict[str, str | DataType]"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:48: error: Too few arguments for "Struct" [call-arg]
+ ibis/expr/datatypes/value.py:48: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:48: error: Argument 1 to "Struct" has incompatible type "dict[str, Any]"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:55: error: Too few arguments for "Map" [call-arg]
+ ibis/expr/datatypes/value.py:55: error: Incompatible arguments for "Map"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:55: error: Argument 1 to "Map" has incompatible type "Null"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:69: error: Too few arguments for "Array" [call-arg]
+ ibis/expr/datatypes/value.py:69: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:69: error: Argument 1 to "Array" has incompatible type "Null"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:101: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/datatypes/value.py:101: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:101: error: Argument 1 to "Interval" has incompatible type "IntervalUnit"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:104: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/datatypes/value.py:104: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:104: error: Argument 1 to "Interval" has incompatible type "IntervalUnit"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:106: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/datatypes/value.py:106: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:106: error: Argument 1 to "Interval" has incompatible type "IntervalUnit"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:108: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/datatypes/value.py:108: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:108: error: Argument 1 to "Interval" has incompatible type "IntervalUnit"; expected "bool" [arg-type]
- ibis/expr/datatypes/value.py:205: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/datatypes/value.py:205: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/datatypes/value.py:205: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/expr/schema.py:306: error: Too few arguments for "Struct" [call-arg]
+ ibis/expr/schema.py:306: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/expr/schema.py:306: error: Argument 1 to "Struct" has incompatible type "Schema"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:208: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:208: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:208: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:209: error: Argument 1 to "Array" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:211: error: Argument "nullable" to "Array" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:254: error: "Map" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:254: error: Too few arguments for "Map" [call-arg]
+ ibis/backends/sql/datatypes.py:254: error: Incompatible arguments for "Map"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:254: error: Argument 1 to "Map" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:254: error: Argument "nullable" to "Map" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:272: error: "Struct" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:272: error: Too few arguments for "Struct" [call-arg]
+ ibis/backends/sql/datatypes.py:272: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:272: error: Argument 1 to "Struct" has incompatible type "dict[Any, DataType]"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:272: error: Argument "nullable" to "Struct" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:319: error: "Interval" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:319: error: Too few arguments for "Interval" [call-arg]
+ ibis/backends/sql/datatypes.py:319: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:319: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:319: error: Argument "nullable" to "Interval" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:514: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:514: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:514: error: Argument 1 to "Array" has incompatible type "LineString"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:516: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:516: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:516: error: Argument 1 to "Array" has incompatible type "Polygon"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:518: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:518: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:518: error: Argument 1 to "Array" has incompatible type "Point"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:520: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:520: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:520: error: Argument 1 to "Array" has incompatible type "MACADDR"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:522: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:522: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:522: error: Argument 1 to "Array" has incompatible type "MACADDR"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:711: error: Too few arguments for "Interval" [call-arg]
+ ibis/backends/sql/datatypes.py:711: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:711: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:712: error: Too few arguments for "Interval" [call-arg]
+ ibis/backends/sql/datatypes.py:712: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:712: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:865: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:865: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:865: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:865: error: Argument 1 to "Array" has incompatible type "JSON"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:865: error: Argument "nullable" to "Array" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1252: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:1252: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:1252: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:1252: error: Argument 1 to "Array" has incompatible type "Null"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1253: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:1253: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:1253: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:1253: error: Argument 1 to "Array" has incompatible type "Null"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1317: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:1317: error: Too few arguments for "Array" [call-arg]
+ ibis/backends/sql/datatypes.py:1317: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:1317: error: Argument 1 to "Array" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1317: error: Argument "nullable" to "Array" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1320: error: "Struct" gets multiple values for keyword argument "nullable" [misc]
- ibis/backends/sql/datatypes.py:1320: error: Too few arguments for "Struct" [call-arg]
+ ibis/backends/sql/datatypes.py:1320: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/backends/sql/datatypes.py:1320: error: Argument 1 to "Struct" has incompatible type "tuple[Any, ...]"; expected "bool" [arg-type]
- ibis/backends/sql/datatypes.py:1320: error: Argument "nullable" to "Struct" has incompatible type "bool | None"; expected "bool" [arg-type]
- ibis/formats/pyarrow.py:95: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/pyarrow.py:95: error: Too few arguments for "Array" [call-arg]
+ ibis/formats/pyarrow.py:95: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/formats/pyarrow.py:95: error: Argument 1 to "Array" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/formats/pyarrow.py:98: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/pyarrow.py:98: error: Too few arguments for "Array" [call-arg]
+ ibis/formats/pyarrow.py:98: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/formats/pyarrow.py:98: error: Argument 1 to "Array" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/formats/pyarrow.py:103: error: "Struct" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/pyarrow.py:103: error: Too few arguments for "Struct" [call-arg]
+ ibis/formats/pyarrow.py:103: error: Incompatible arguments for "Struct"; check for missing arguments [call-arg]
- ibis/formats/pyarrow.py:103: error: Argument 1 to "Struct" has incompatible type "dict[Any, DataType]"; expected "bool" [arg-type]
- ibis/formats/pyarrow.py:108: error: "Map" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/pyarrow.py:108: error: Too few arguments for "Map" [call-arg]
+ ibis/formats/pyarrow.py:108: error: Incompatible arguments for "Map"; check for missing arguments [call-arg]
- ibis/formats/pyarrow.py:108: error: Argument 1 to "Map" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/formats/polars.py:70: error: "Array" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/polars.py:70: error: Too few arguments for "Array" [call-arg]
+ ibis/formats/polars.py:70: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/formats/polars.py:70: error: Argument 1 to "Array" has incompatible type "DataType"; expected "bool" [arg-type]
- ibis/formats/numpy.py:54: error: "Interval" gets multiple values for keyword argument "nullable" [misc]
- ibis/formats/numpy.py:54: error: Too few arguments for "Interval" [call-arg]
+ ibis/formats/numpy.py:54: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/formats/numpy.py:54: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/expr/operations/strings.py:267: error: Too few arguments for "Array" [call-arg]
+ ibis/expr/operations/strings.py:267: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/expr/operations/strings.py:267: error: Argument 1 to "Array" has incompatible type "String"; expected "bool" [arg-type]
- ibis/expr/operations/strings.py:302: error: Too few arguments for "Array" [call-arg]
+ ibis/expr/operations/strings.py:302: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/expr/operations/strings.py:302: error: Argument 1 to "Array" has incompatible type "String"; expected "bool" [arg-type]
- ibis/expr/operations/temporal.py:308: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/operations/temporal.py:308: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/operations/temporal.py:308: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/expr/operations/temporal.py:338: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/operations/temporal.py:338: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/operations/temporal.py:338: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/expr/operations/temporal.py:368: error: Too few arguments for "Interval" [call-arg]
+ ibis/expr/operations/temporal.py:368: error: Incompatible arguments for "Interval"; check for missing arguments [call-arg]
- ibis/expr/operations/temporal.py:368: error: Argument 1 to "Interval" has incompatible type "str"; expected "bool" [arg-type]
- ibis/expr/operations/json.py:34: error: Too few arguments for "Array" [call-arg]
+ ibis/expr/operations/json.py:34: error: Incompatible arguments for "Array"; check for missing arguments [call-arg]
- ibis/expr/operations/json.py:34: error: Argument 1 to "Array" has incompatible type "JSON"; expected "bool" [arg-type]
- ibis/expr/operations/json.py:47: error: Too few arguments for "Map" [call-arg]
+ ibis/expr/operations/json.py:47: error: Incompatible arguments for "Map"; check for missing arguments [call-arg]
- ibis/expr/operations/json.py:47: error: Argument 1 to "Map" has incompatible type "String"; expected "bool" [arg-type]
+ ibis/expr/types/generic.py:1284: error: Incompatible arguments for "GroupConcat"; check for missing arguments [call-arg]
... (truncated 772 lines) ...
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Summary
This PR improves error messages when positional arguments are missing from a function call.
Problem
When a user forgets a positional argument, mypy would previously emit multiple confusing type errors because the subsequent arguments would be "shifted" and mismatched with their expected types.
Solution
Detect patterns where a forgotten positional argument causes subsequent arguments to be misaligned with their expected parameters. Instead of showing multiple type errors, emit a single consolidated message that suggests which argument might be missing.