diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3e2920024f..3c65091a58 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,22 @@ jobs:
       - name: Check F# code
         run: dotnet fantomas . --check --verbosity d
 
+      - name: Set up Python 3.13
+        uses: actions/setup-python@v7
+        with:
+          python-version: "3.13"
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: true
+
+      - name: Check Python imports and exports
+        run: uv run --frozen ruff check --select I,RUF022,RUF068 src/fable-library-py
+
+      - name: Check Python formatting
+        run: uv run --frozen ruff format --check src/fable-library-py
+
   # Verify that Fable.sln can be restored
   # See: https://github.com/fable-compiler/Fable/issues/3687
   restore-project:
diff --git a/src/fable-library-py/fable_library/array_.py b/src/fable-library-py/fable_library/array_.py
index 72ce5665ef..2b8877c24d 100644
--- a/src/fable-library-py/fable_library/array_.py
+++ b/src/fable-library-py/fable_library/array_.py
@@ -196,6 +196,7 @@
     "UInt64ArrayCons",
     "add_in_place",
     "add_range_in_place",
+    "all_pairs",
     "append",
     "average",
     "average_by",
@@ -211,6 +212,7 @@
     "create",
     "empty",
     "equals_with",
+    "exactly_one",
     "exists",
     "exists2",
     "exists_offset",
@@ -261,8 +263,6 @@
     "partition",
     "permute",
     "pick",
-    "reduce",
-    "reduce_back",
     "random_choice",
     "random_choice_by",
     "random_choice_with",
@@ -278,6 +278,8 @@
     "random_shuffle_in_place_by",
     "random_shuffle_in_place_with",
     "random_shuffle_with",
+    "reduce",
+    "reduce_back",
     "remove_all_in_place",
     "remove_at",
     "remove_in_place",
@@ -301,8 +303,6 @@
     "split_into",
     "sum",
     "sum_by",
-    "all_pairs",
-    "exactly_one",
     "tail",
     "take",
     "take_while",
@@ -320,8 +320,8 @@
     "unzip",
     "unzip3",
     "update_at",
-    "windowed",
     "where",
+    "windowed",
     "zero_create",
     "zip",
     "zip3",
diff --git a/src/fable-library-py/fable_library/async_builder.py b/src/fable-library-py/fable_library/async_builder.py
index e3f43ead41..c65ee3e558 100644
--- a/src/fable-library-py/fable_library/async_builder.py
+++ b/src/fable-library-py/fable_library/async_builder.py
@@ -456,3 +456,23 @@ def Zero(self) -> Async[None]:
 
 
 singleton = AsyncBuilder()
+
+
+__all__ = [
+    "AnonymousAsyncContext",
+    "Async",
+    "AsyncBuilder",
+    "CancellationCallbackError",
+    "CancellationToken",
+    "Continuations",
+    "IAsyncContext",
+    "OperationCanceledError",
+    "ScheduledItem",
+    "TaskCanceledError",
+    "Trampoline",
+    "empty_continuation",
+    "protected_bind",
+    "protected_cont",
+    "protected_return",
+    "singleton",
+]
diff --git a/src/fable-library-py/fable_library/char.py b/src/fable-library-py/fable_library/char.py
index 9359054d4a..9be399678e 100644
--- a/src/fable-library-py/fable_library/char.py
+++ b/src/fable-library-py/fable_library/char.py
@@ -239,7 +239,6 @@ def parse(input: str) -> str:
     "is_number",
     "is_punctuation",
     "is_separator",
-    "is_separator",
     "is_surrogate",
     "is_surrogate_pair",
     "is_symbol",
diff --git a/src/fable-library-py/fable_library/core/__init__.py b/src/fable-library-py/fable_library/core/__init__.py
index 042ca692fa..66db388c1e 100644
--- a/src/fable-library-py/fable_library/core/__init__.py
+++ b/src/fable-library-py/fable_library/core/__init__.py
@@ -1,4 +1,7 @@
-from math import copysign as _copysign, fmod as _fmod, inf as _inf, nan as _nan
+from math import copysign as _copysign
+from math import fmod as _fmod
+from math import inf as _inf
+from math import nan as _nan
 from typing import Literal, SupportsFloat, SupportsInt
 
 from ._core import (
diff --git a/src/fable-library-py/fable_library/diagnostics.py b/src/fable-library-py/fable_library/diagnostics.py
index 03c78829ca..fbe00a6a4e 100644
--- a/src/fable-library-py/fable_library/diagnostics.py
+++ b/src/fable-library-py/fable_library/diagnostics.py
@@ -54,3 +54,11 @@ def frequency() -> int:
 
 def get_timestamp() -> int64:
     return int64(time.perf_counter_ns())
+
+
+__all__ = [
+    "StopWatch",
+    "TimerError",
+    "frequency",
+    "get_timestamp",
+]
diff --git a/src/fable-library-py/fable_library/event.py b/src/fable-library-py/fable_library/event.py
index 115f2e7f7f..26aebcd35b 100644
--- a/src/fable-library-py/fable_library/event.py
+++ b/src/fable-library-py/fable_library/event.py
@@ -217,3 +217,25 @@ def create_event[T](
     remove_handler: Callable[[DotNetDelegate[T]], None],
 ) -> IEvent[T]:
     return AnonymousEvent[T](add_handler, remove_handler)
+
+
+__all__ = [
+    "AnonymousEvent",
+    "Delegate",
+    "DotNetDelegate",
+    "Event",
+    "EventDelegate",
+    "IDelegateEvent",
+    "IEvent",
+    "IEvent_2",
+    "add",
+    "choose",
+    "create_event",
+    "filter",
+    "map",
+    "merge",
+    "pairwise",
+    "partition",
+    "scan",
+    "split",
+]
diff --git a/src/fable-library-py/fable_library/exception_bases.py b/src/fable-library-py/fable_library/exception_bases.py
index 6e66ff5c20..817c257320 100644
--- a/src/fable-library-py/fable_library/exception_bases.py
+++ b/src/fable-library-py/fable_library/exception_bases.py
@@ -50,3 +50,16 @@ class MemoryErrorBase(ExceptionBase, MemoryError):
 
 class TimeoutErrorBase(ExceptionBase, TimeoutError):
     """A timeout error with .NET message and inner-exception support."""
+
+
+__all__ = [
+    "ExceptionBase",
+    "IndexErrorBase",
+    "MemoryErrorBase",
+    "NotImplementedErrorBase",
+    "OverflowErrorBase",
+    "RuntimeErrorBase",
+    "TimeoutErrorBase",
+    "ValueErrorBase",
+    "ZeroDivisionErrorBase",
+]
diff --git a/src/fable-library-py/fable_library/file.py b/src/fable-library-py/fable_library/file.py
index b2fb8b6ea3..dced0abab9 100644
--- a/src/fable-library-py/fable_library/file.py
+++ b/src/fable-library-py/fable_library/file.py
@@ -107,3 +107,24 @@ def replace(source_file_name: str, destination_file_name: str, destination_backu
     with open(destination_backup_file_name, "wb") as f:
         f.write(data)
     os.replace(source_file_name, destination_file_name)
+
+
+__all__ = [
+    "copy",
+    "delete",
+    "exists",
+    "move",
+    "read_all_bytes",
+    "read_all_bytes_async",
+    "read_all_lines",
+    "read_all_lines_async",
+    "read_all_text",
+    "read_all_text_async",
+    "replace",
+    "write_all_bytes",
+    "write_all_bytes_async",
+    "write_all_lines",
+    "write_all_lines_async",
+    "write_all_text",
+    "write_all_text_async",
+]
diff --git a/src/fable-library-py/fable_library/long.py b/src/fable-library-py/fable_library/long.py
index 90febfa89f..0936936fbf 100644
--- a/src/fable-library-py/fable_library/long.py
+++ b/src/fable-library-py/fable_library/long.py
@@ -304,54 +304,29 @@ def to_string(x: int64 | uint64) -> str:
     "from_value",
     "get_range",
     "max",
-    "max",
-    "min",
     "min",
     "op_addition",
-    "op_addition",
-    "op_bitwise_and",
     "op_bitwise_and",
     "op_bitwise_or",
-    "op_bitwise_or",
-    "op_division",
     "op_division",
     "op_equality",
-    "op_equality",
     "op_exclusive_or",
-    "op_exclusive_or",
-    "op_greater_than",
     "op_greater_than",
     "op_greater_than_or_equal",
-    "op_greater_than_or_equal",
     "op_inequality",
-    "op_inequality",
-    "op_left_shift",
     "op_left_shift",
     "op_less_than",
-    "op_less_than",
     "op_less_than_or_equal",
-    "op_less_than_or_equal",
-    "op_logical_not",
     "op_logical_not",
     "op_modulus",
-    "op_modulus",
     "op_multiply",
-    "op_multiply",
-    "op_right_shift",
     "op_right_shift",
     "op_subtraction",
-    "op_subtraction",
     "op_unary_negation",
-    "op_unary_negation",
-    "op_unary_plus",
     "op_unary_plus",
     "parse",
-    "parse",
-    "sign",
     "sign",
     "to_number",
     "to_string",
-    "to_string",
-    "try_parse",
     "try_parse",
 ]
diff --git a/src/fable-library-py/fable_library/map_util.py b/src/fable-library-py/fable_library/map_util.py
index d33794bb5b..69ea4909a6 100644
--- a/src/fable-library-py/fable_library/map_util.py
+++ b/src/fable-library-py/fable_library/map_util.py
@@ -272,3 +272,31 @@ def assign(key: str, case_rule: CaseRules, value: Any):
             fail(kv_pair)
 
     return obj
+
+
+__all__ = [
+    "CaseRules",
+    "add_to_dict",
+    "add_to_set",
+    "change_case",
+    "contains_in_set",
+    "contains_value",
+    "copy_to_array_from_set",
+    "dashify",
+    "except_with_set",
+    "get_item_from_dict",
+    "intersect_with_set",
+    "is_proper_subset_of_set",
+    "is_proper_superset_of_set",
+    "is_subset_of_set",
+    "is_superset_of_set",
+    "key_value_list",
+    "make_dict",
+    "overlaps_with_set",
+    "remove_from_dict",
+    "remove_from_set",
+    "set_equals_set",
+    "symmetric_except_with_set",
+    "try_get_value",
+    "union_with_set",
+]
diff --git a/src/fable-library-py/fable_library/observable.py b/src/fable-library-py/fable_library/observable.py
index 9c5cef70ae..7cb80d1fe1 100644
--- a/src/fable-library-py/fable_library/observable.py
+++ b/src/fable-library-py/fable_library/observable.py
@@ -216,3 +216,22 @@ def split[T, U, V](
         choose(lambda v: Choice_tryValueIfChoice1Of2(splitter(v)), source),
         choose(lambda v: Choice_tryValueIfChoice2Of2(splitter(v)), source),
     )
+
+
+__all__ = [
+    "IObservable",
+    "IObserver",
+    "Observable",
+    "Observer",
+    "add",
+    "choose",
+    "filter",
+    "map",
+    "merge",
+    "pairwise",
+    "partition",
+    "protect",
+    "scan",
+    "split",
+    "subscribe",
+]
diff --git a/src/fable-library-py/fable_library/protocols.py b/src/fable-library-py/fable_library/protocols.py
index 49bd980945..a123a17f49 100644
--- a/src/fable-library-py/fable_library/protocols.py
+++ b/src/fable-library-py/fable_library/protocols.py
@@ -442,3 +442,31 @@ def keys(self, __unit: Unit = None) -> Iterable[K]:
     def __getitem__(self, key: K, /) -> V:
         """Get the value for a key."""
         ...
+
+
+__all__ = [
+    "HashCode",
+    "ICollection",
+    "IComparable",
+    "IComparable_1",
+    "IComparer",
+    "IComparer_1",
+    "IDictionary_2",
+    "IDisposable",
+    "IEnumerable",
+    "IEnumerable_1",
+    "IEnumerator",
+    "IEqualityComparer",
+    "IEqualityComparer_1",
+    "IEquatable",
+    "IGenericAdder",
+    "IGenericAverager",
+    "IReadOnlyCollection_1",
+    "IReadOnlyDictionary",
+    "IReadOnlyDictionary_2",
+    "IReadOnlySet_1",
+    "ISet",
+    "IStructuralComparable",
+    "IStructuralEquatable",
+    "SupportsLessThan",
+]
diff --git a/src/fable-library-py/fable_library/quotation.py b/src/fable-library-py/fable_library/quotation.py
index 8f2a821dd3..df41ab4a0a 100644
--- a/src/fable-library-py/fable_library/quotation.py
+++ b/src/fable-library-py/fable_library/quotation.py
@@ -698,3 +698,72 @@ def is_specific_call(template: Expr, expr: Expr) -> tuple[Expr | None, FSharpLis
     # names rather than System.Type, so it is always empty; callers match it with
     # a wildcard.
     return (instance, of_array(Array([])), of_array(expr.args))
+
+
+__all__ = [
+    "Expr",
+    "ExprApplication",
+    "ExprCall",
+    "ExprFieldGet",
+    "ExprFieldSet",
+    "ExprIfThenElse",
+    "ExprLambda",
+    "ExprLet",
+    "ExprNewList",
+    "ExprNewRecord",
+    "ExprNewTuple",
+    "ExprNewUnion",
+    "ExprSequential",
+    "ExprTupleGet",
+    "ExprUnionField",
+    "ExprUnionTag",
+    "ExprValue",
+    "ExprVarExpr",
+    "ExprVarSet",
+    "Var",
+    "call_declaring_type",
+    "evaluate",
+    "expr_to_string",
+    "get_free_vars",
+    "get_type",
+    "is_and_also",
+    "is_application",
+    "is_call",
+    "is_field_get",
+    "is_if_then_else",
+    "is_lambda",
+    "is_let",
+    "is_new_record",
+    "is_new_tuple",
+    "is_new_union_case",
+    "is_or_else",
+    "is_sequential",
+    "is_specific_call",
+    "is_tuple_get",
+    "is_value",
+    "is_var",
+    "mk_application",
+    "mk_call",
+    "mk_field_get",
+    "mk_field_set",
+    "mk_if_then_else",
+    "mk_lambda",
+    "mk_let",
+    "mk_new_list",
+    "mk_new_record",
+    "mk_new_tuple",
+    "mk_new_union",
+    "mk_null",
+    "mk_quot_var",
+    "mk_sequential",
+    "mk_tuple_get",
+    "mk_union_field",
+    "mk_union_tag",
+    "mk_value",
+    "mk_var",
+    "mk_var_set",
+    "substitute",
+    "var_get_is_mutable",
+    "var_get_name",
+    "var_get_type",
+]
diff --git a/src/fable-library-py/fable_library/reflection.py b/src/fable-library-py/fable_library/reflection.py
index 071b0636d8..b9e1fef101 100644
--- a/src/fable-library-py/fable_library/reflection.py
+++ b/src/fable-library-py/fable_library/reflection.py
@@ -500,3 +500,90 @@ def get_case_name(x: Any) -> str:
 def get_case_fields(x: Any) -> list[Any]:
     assert_union(x)
     return x.fields
+
+
+__all__ = [
+    "CaseInfo",
+    "Constructor",
+    "EnumCase",
+    "FieldInfo",
+    "MethodInfo",
+    "ParameterInfo",
+    "PropertyInfo",
+    "TypeInfo",
+    "anon_record_type",
+    "array_type",
+    "assert_union",
+    "bigint_type",
+    "bool_type",
+    "char_type",
+    "class_type",
+    "create_instance",
+    "decimal_type",
+    "delegate_type",
+    "enum_type",
+    "equals",
+    "float32_type",
+    "float64_type",
+    "full_name",
+    "get_case_fields",
+    "get_case_name",
+    "get_case_tag",
+    "get_element_type",
+    "get_enum_case",
+    "get_enum_name",
+    "get_enum_names",
+    "get_enum_underlying_type",
+    "get_enum_values",
+    "get_function_elements",
+    "get_generic_type_definition",
+    "get_generics",
+    "get_record_elements",
+    "get_record_field",
+    "get_record_fields",
+    "get_tuple_elements",
+    "get_tuple_field",
+    "get_tuple_fields",
+    "get_union_case_fields",
+    "get_union_cases",
+    "get_union_fields",
+    "get_value",
+    "int8_type",
+    "int16_type",
+    "int32_type",
+    "int64_type",
+    "is_array",
+    "is_enum",
+    "is_enum_defined",
+    "is_erased_to_number",
+    "is_function",
+    "is_generic_type",
+    "is_instance_of_type",
+    "is_record",
+    "is_subclass_of",
+    "is_tuple",
+    "is_union",
+    "lambda_type",
+    "list_type",
+    "make_generic_type",
+    "make_record",
+    "make_tuple",
+    "make_union",
+    "name",
+    "namespace",
+    "nativeint_type",
+    "obj_type",
+    "option_type",
+    "parse_enum",
+    "record_type",
+    "string_type",
+    "try_parse_enum",
+    "tuple_type",
+    "uint8_type",
+    "uint16_type",
+    "uint32_type",
+    "uint64_type",
+    "unativeint_type",
+    "union_type",
+    "unit_type",
+]
diff --git a/src/fable-library-py/fable_library/seq_native.py b/src/fable-library-py/fable_library/seq_native.py
index 1e2342442b..335ba69ebe 100644
--- a/src/fable-library-py/fable_library/seq_native.py
+++ b/src/fable-library-py/fable_library/seq_native.py
@@ -29,6 +29,7 @@
 from .types import UNIT, Unit
 from .util import Enumerator, get_enumerator, to_iterator
 
+
 _SENTINEL: Any = object()
 
 
diff --git a/src/fable-library-py/fable_library/thread.py b/src/fable-library-py/fable_library/thread.py
index b704c56ba4..4f0a17b78f 100644
--- a/src/fable-library-py/fable_library/thread.py
+++ b/src/fable-library-py/fable_library/thread.py
@@ -6,3 +6,8 @@
 def sleep(milliseconds: int | TimeSpan) -> None:
     milliseconds_value = to_milliseconds(milliseconds)
     time.sleep(milliseconds_value / 1000.0)
+
+
+__all__ = [
+    "sleep",
+]
diff --git a/src/fable-library-py/fable_library/time_span.py b/src/fable-library-py/fable_library/time_span.py
index 3467ce29ad..3e5de67fde 100644
--- a/src/fable-library-py/fable_library/time_span.py
+++ b/src/fable-library-py/fable_library/time_span.py
@@ -340,14 +340,10 @@ def to_milliseconds(value: int | TimeSpan) -> float:
     "subtract",
     "to_milliseconds",
     "total_days",
-    "total_days",
-    "total_hours",
     "total_hours",
     "total_microseconds",
     "total_milliseconds",
     "total_minutes",
-    "total_minutes",
-    "total_seconds",
     "total_seconds",
     "try_parse",
 ]
diff --git a/src/fable-library-py/fable_library/uri.py b/src/fable-library-py/fable_library/uri.py
index 1b71567eb5..1925728356 100644
--- a/src/fable-library-py/fable_library/uri.py
+++ b/src/fable-library-py/fable_library/uri.py
@@ -108,3 +108,9 @@ def try_create(uri: str | Uri, kind_or_uri: UriKind | Uri | str | int, out: FSha
             return True
         except Exception:
             return False
+
+
+__all__ = [
+    "Uri",
+    "UriKind",
+]
diff --git a/src/fable-library-py/fable_library/util.py b/src/fable-library-py/fable_library/util.py
index a808660b3b..e4aaf03d4c 100644
--- a/src/fable-library-py/fable_library/util.py
+++ b/src/fable-library-py/fable_library/util.py
@@ -967,19 +967,19 @@ def range(start: int, stop: int, step: int = 1) -> Iterable[int]:
     "Unit",
     "array_hash",
     "copy_to_array",
+    "create_random",
     "erase_unit_callable",
     "escape_data_string",
     "escape_uri_string",
-    "create_random",
     "get_platform",
     "identity_hash",
     "ignore",
     "nullable",
     "number_hash",
     "physical_hash",
-    "random_int",
     "random_bytes",
     "random_double",
+    "random_int",
     "range",
     "round",
     "to_iterable",
diff --git a/src/fable-library-py/tests/test_ints.py b/src/fable-library-py/tests/test_ints.py
index 828de2a5b0..cb30093192 100644
--- a/src/fable-library-py/tests/test_ints.py
+++ b/src/fable-library-py/tests/test_ints.py
@@ -2,7 +2,6 @@
 from decimal import Decimal
 
 import pytest
-
 from fable_library.core import FSharpRef, Int32, byte, float32, int16, int32, int64, sbyte, uint16, uint32, uint64
 from fable_library.int32 import parse as int32_parse
 from fable_library.int32 import try_parse as int32_try_parse