Add CoreSchemaType Literal

pydantic_core/__init__.py

@@ -13,12 +13,13 @@
     __version__,
     to_json,
 )
-from .core_schema import CoreConfig, CoreSchema
+from .core_schema import CoreConfig, CoreSchema, CoreSchemaType
 
 __all__ = (
     '__version__',
     'CoreConfig',
     'CoreSchema',
+    'CoreSchemaType',
     'SchemaValidator',
     'SchemaSerializer',
     'Url',

pydantic_core/core_schema.py

@@ -2587,6 +2587,48 @@ def multi_host_url_schema(
     MultiHostUrlSchema,
 ]
 
+# to update this, call `pytest -k test_core_schema_type_literal` and copy the output
+CoreSchemaType = Literal[
+    'any',
+    'none',
+    'bool',
+    'int',
+    'float',
+    'str',
+    'bytes',
+    'date',
+    'time',
+    'datetime',
+    'timedelta',
+    'literal',
+    'is-instance',
+    'is-subclass',
+    'callable',
+    'list',
+    'tuple',
+    'set',
+    'frozenset',
+    'generator',
+    'dict',
+    'function',
+    'default',
+    'nullable',
+    'union',
+    'tagged-union',
+    'chain',
+    'lax-or-strict',
+    'typed-dict',
+    'model',
+    'arguments',
+    'call',
+    'recursive-ref',
+    'custom-error',
+    'json',
+    'url',
+    'multi-host-url',
+]
+
+
 # used in _pydantic_core.pyi::PydanticKnownError
 # to update this, call `pytest -k test_all_errors` and copy the output
 ErrorType = Literal[

tests/serializers/test_functions.py

@@ -164,19 +164,19 @@ def append_args(value, info):
     )
     assert s.to_python(123) == (
         "123 info=SerializationInfo(include=None, exclude=None, mode='python', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )
     assert s.to_python(123, mode='other') == (
         "123 info=SerializationInfo(include=None, exclude=None, mode='other', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )
     assert s.to_python(123, include={'x'}) == (
         "123 info=SerializationInfo(include={'x'}, exclude=None, mode='python', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )
     assert s.to_python(123, mode='json', exclude={1: {2}}) == (
         "123 info=SerializationInfo(include=None, exclude={1: {2}}, mode='json', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )
     assert s.to_json(123) == (
         b'"123 info=SerializationInfo(include=None, exclude=None, mode=\'json\', by_alias=True, exclude_unset=False, '

tests/test_misc.py

@@ -1,10 +1,11 @@
 import re
 import sys
 from pathlib import Path
+from typing import get_args
 
 import pytest
 
-from pydantic_core import core_schema
+from pydantic_core import CoreSchema, CoreSchemaType, core_schema
 from pydantic_core._pydantic_core import (
     SchemaError,
     SchemaValidator,
@@ -178,3 +179,18 @@ def test_all_errors():
         literal = ''.join(f'\n    {e!r},' for e in error_types)
         print(f'python code (end of pydantic_core/core_schema.py):\n\nErrorType = Literal[{literal}\n]')
         pytest.fail('core_schema.ErrorType needs to be updated')
+
+
+def test_core_schema_type_literal():
+    def get_type_value(schema):
+        type_ = schema.__annotations__['type']
+        m = re.search(r"Literal\['(.+?)']", type_.__forward_arg__)
+        assert m, f'Unknown schema type: {type_}'
+        return m.group(1)
+
+    schema_types = tuple(get_type_value(x) for x in CoreSchema.__args__)
+    schema_types = tuple(dict.fromkeys(schema_types))  # remove duplicates while preserving order
+    if get_args(CoreSchemaType) != schema_types:
+        literal = ''.join(f'\n    {e!r},' for e in schema_types)
+        print(f'python code (near end of pydantic_core/core_schema.py):\n\nCoreSchemaType = Literal[{literal}\n]')
+        pytest.fail('core_schema.CoreSchemaType needs to be updated')

tests/test_typing.py

@@ -189,7 +189,7 @@ def f(__input: Any, __info: core_schema.SerializationInfo) -> str:
     )
     assert s.to_python(123) == (
         "SerializationInfo(include=None, exclude=None, mode='python', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )
 
 
@@ -204,7 +204,7 @@ def f(__input: Any, __serialize: core_schema.SerializeWrapHandler, __info: core_
     )
     # insert_assert(s.to_python(123, mode='json'))
     assert s.to_python(123, mode='json') == (
-        "SerializationCallable(serializer=str) "
+        'SerializationCallable(serializer=str) '
         "SerializationInfo(include=None, exclude=None, mode='json', by_alias=True, exclude_unset=False, "
-        "exclude_defaults=False, exclude_none=False, round_trip=False)"
+        'exclude_defaults=False, exclude_none=False, round_trip=False)'
     )