add

ccxt/static_dependencies/ethereum/utils/numeric.py

@@ -0,0 +1,43 @@
+from abc import (
+    ABC,
+    abstractmethod,
+)
+import decimal
+import numbers
+from typing import (
+    Any,
+    TypeVar,
+    Union,
+)
+
+
+class Comparable(ABC):
+    @abstractmethod
+    def __lt__(self, other: Any) -> bool:
+        ...
+
+    @abstractmethod
+    def __gt__(self, other: Any) -> bool:
+        ...
+
+
+TComparable = Union[Comparable, numbers.Real, int, float, decimal.Decimal]
+
+
+TValue = TypeVar("TValue", bound=TComparable)
+
+
+def clamp(lower_bound: TValue, upper_bound: TValue, value: TValue) -> TValue:
+    # The `mypy` ignore statements here are due to doing a comparison of
+    # `Union` types which isn't allowed. (per cburgdorf). This approach was
+    # chosen over using `typing.overload` to define multiple signatures for
+    # each comparison type here since the added value of "proper" typing
+    # doesn't seem to justify the complexity of having a bunch of different
+    # signatures defined. The external library perspective on this function
+    # should still be adequate under this approach
+    if value < lower_bound:  # type: ignore
+        return lower_bound
+    elif value > upper_bound:  # type: ignore
+        return upper_bound
+    else:
+        return value