bluebinary · bluebinary · Feb 4, 2026 · Feb 4, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Classicist Library Change Log
 
+## [1.0.4] - 2026-02-03
+### Added
+- Added support for the new `@runtimer` decorator which can be used to gather run times
+for functions, class methods and instance methods.
+
+### Updated
+- Improved top-level import availability for the `AliasError` and `AnnotationError` classes.
+
 ## [1.0.3] - 2026-01-30
 ### Updated
 - Improved logging for aliasing functionality.

diff --git a/README.md b/README.md
@@ -8,6 +8,7 @@ The Classicist library provides several useful decorators and helper methods inc
  * `@deprecated` – a decorator that can be used to mark functions, classes and methods as being deprecated;
  * `@alias` – a decorator that can be used to add aliases to classes, methods defined within classes, module-level functions, and nested functions when overriding the aliasing scope;
  * `@nocache` – a decorator that can be used to mark functions and methods as not being suitable for caching;
+ * `@runtimer` – a decorator that can be used to time function and method calls;
  * `shadowproof` – a metaclass that can be used to protect subclasses from class-level attributes
   being overwritten (or shadowed) which can otherwise negatively affect class behaviour in some cases.
 
@@ -449,6 +450,48 @@ class Test(object):
         pass
 ```
 
+#### Runtimer: Function & Method Call Timing
+
+The `@runtimer` decorator can be used to obtain run times for function and method calls,
+including the start and stop `datetime`, the `timedelta` and the duration in seconds.
+
+To collect timing information simply import the `runtimer` decorator from the library,
+and apply it to the function, class method or instance method that you wish to time, and
+after the call has been made, you can obtain the run time information from the function
+or method via the `classicist` library's `runtime` helper method, which provides access
+to an instance of the library's `Runtimer` class which is used to track the run time:
+
+```python
+from classicist import runtimer, runtime, Runtimer
+from datetime import datetime
+from time import sleep
+
+@runtimer
+def function_to_time(value: int) -> int:
+  sleep(0.01)
+  return value * 100
+
+# Obtain a reference to the function's Runtimer (created by the @runtimer decorator)
+# This reference can be obtained before or after a call to the decorated function
+runtimer: Runtimer = runtime(function_to_time)
+assert isinstance(runtimer, Runtimer)
+
+# Obtain the time before the function call for illustrative purposes (not needed in use)
+started: datetime = datetime.now()
+
+# Call the method to perform its work, and its runtime will be gathered
+assert function_to_time(2) == 200
+
+# Obtain the time after the function call for illustrative purposes (not needed in use)
+stopped: datetime = datetime.now()
+
+# Use the gathered runtime information as needed
+assert runtimer.started > started
+assert runtimer.duration >= 0.01
+assert runtimer.timedelta.total_seconds() >= 0.01
+assert runtimer.stopped < stopped
+```
+
 #### ShadowProof: Attribute Shadowing Protection Metaclass
 
 The `shadowproof` metaclass can be used to protect classes and subclasses from attribute

diff --git a/source/classicist/__init__.py b/source/classicist/__init__.py
@@ -1,20 +1,39 @@
-# Decorator Classes
+# Decorators
 from classicist.decorators import (
+    # @alias decorator
     alias,
-    annotate,
+    # @annotation decorator
     annotation,
-    annotations,
+    # @classproperty decorator
     classproperty,
+    # @deprecated decorator
     deprecated,
+    # @hybridmethod decorator
     hybridmethod,
+    # @nocache decorator
     nocache,
+    # @runtimer decorator
+    runtimer,
 )
 
 # Decorator Helper Methods
 from classicist.decorators import (
+    # @alias decorator helper methods
     is_aliased,
     aliases,
+    # @annotation decorator helper methods
+    annotate,
+    annotations,
+    # @deprecated decorator helper methods
     is_deprecated,
+    # @runtimer decorator helper methods
+    runtime,
+    has_runtimer,
+)
+
+# Decorator Related Classes
+from classicist.decorators import (
+    Runtimer,
 )
 
 # Meta Classes
@@ -25,6 +44,8 @@
 
 # Exception Classes
 from classicist.exceptions import (
+    AliasError,
+    AnnotationError,
     AttributeShadowingError,
 )
 
@@ -38,13 +59,20 @@
     "deprecated",
     "hybridmethod",
     "nocache",
+    "runtimer",
     # Decorator Helper Methods
     "is_aliased",
     "aliases",
     "is_deprecated",
+    "runtime",
+    "has_runtimer",
+    # Decorator Related Classes
+    "Runtimer",
     # Meta Classes
     "aliased",
     "shadowproof",
     # Exception Classes
+    "AliasError",
+    "AnnotationError",
     "AttributeShadowingError",
 ]
diff --git a/source/classicist/decorators/__init__.py b/source/classicist/decorators/__init__.py
@@ -4,6 +4,7 @@
 from classicist.decorators.deprecated import deprecated, is_deprecated
 from classicist.decorators.hybridmethod import hybridmethod
 from classicist.decorators.nocache import nocache
+from classicist.decorators.runtimer import Runtimer, runtimer, runtime, has_runtimer
 
 __all__ = [
     "alias",
@@ -17,4 +18,8 @@
     "is_deprecated",
     "hybridmethod",
     "nocache",
+    "Runtimer",
+    "runtimer",
+    "runtime",
+    "has_runtimer",
 ]
diff --git a/source/classicist/decorators/runtimer/__init__.py b/source/classicist/decorators/runtimer/__init__.py
@@ -0,0 +1,165 @@
+from __future__ import annotations
+
+from datetime import datetime, timedelta
+from functools import wraps
+from inspect import unwrap
+
+from classicist.logging import logger
+
+logger = logger.getChild(__name__)
+
+
+class Runtimer(object):
+    """The Runtimer class times and tracks the runtime of function calls."""
+
+    _funcobj: callable = None
+    _started: datetime = None
+    _stopped: datetime = None
+
+    def __init__(self, function: callable):
+        """Supports instantiating an instance of the Runtimer class."""
+
+        if not callable(function):
+            raise TypeError("The 'function' argument must reference a callable!")
+
+        self._funcobj = function
+
+    def __str__(self) -> str:
+        """Returns a string representation of the current Runtimer instance."""
+
+        return f"<{self.__class__.__name__}(started: {self.started}, stopped: {self.stopped}, duration: {self.duration})>"
+
+    def __repr__(self) -> str:
+        """Returns a debug string representation of the current Runtimer instance."""
+
+        return f"<{self.__class__.__name__}(started: {self.started}, stopped: {self.stopped}, duration: {self.duration}) @ {hex(id(self))}>"
+
+    def reset(self) -> Runtimer:
+        """Supports resetting the Runtimer timing information."""
+
+        self._started = None
+        self._stopped = None
+
+        return self
+
+    def start(self) -> Runtimer:
+        """Supports starting the Runtimer timer by recording the current datetime."""
+
+        self._started = datetime.now()
+        self._stopped = None
+
+        return self
+
+    def stop(self) -> Runtimer:
+        """Supports stopping the Runtimer timer by recording the current datetime."""
+
+        if self._started is None:
+            self._started = datetime.now()
+        self._stopped = datetime.now()
+
+        return self
+
+    @property
+    def function(self) -> callable:
+        """Supports returning the Runtimer instance's associated function/method."""
+
+        return self._funcobj
+
+    @property
+    def started(self) -> datetime:
+        """Supports returning the started datetime or the current time as a fallback."""
+
+        return self._started or datetime.now()
+
+    @property
+    def stopped(self) -> datetime:
+        """Supports returning the stopped datetime or the current time as a fallback."""
+
+        return self._stopped or datetime.now()
+
+    @property
+    def timedelta(self) -> timedelta:
+        """Supports returning the timedelta for the decorated function's call time."""
+
+        if isinstance(self._started, datetime) and isinstance(self._stopped, datetime):
+            return self._stopped - self._started
+        else:
+            return timedelta(0)
+
+    @property
+    def duration(self) -> float:
+        """Supports returning the duration of the decorated function's call time."""
+
+        return self.timedelta.total_seconds()
+
+
+def runtimer(function: callable) -> callable:
+    """The runtimer decorator method creates an instance of the Runtimer class for the
+    specified function, allowing calls to the function to be timed."""
+
+    if not callable(function):
+        raise TypeError("The 'function' argument must reference a callable!")
+
+    logger.debug("runtimer(function: %s)", function)
+
+    # If the function already has an associated Runtimer instance, reset it
+    if isinstance(
+        _runtimer := getattr(function, "_classicist_runtimer", None), Runtimer
+    ):
+        _runtimer.reset()
+    else:
+        # Otherwise, create a new instance and associate it with the function
+        _runtimer = function._classicist_runtimer = Runtimer(function)
+
+    @wraps(function)
+    def wrapper(*args, **kwargs):
+        logger.debug(
+            "runtimer(function: %s).wrapper(args: %s, kwargs: %s)",
+            function,
+            args,
+            kwargs,
+        )
+
+        _runtimer.start()
+        result = function(*args, **kwargs)
+        _runtimer.stop()
+
+        return result
+
+    return wrapper
+
+
+def runtime(function: callable) -> Runtimer | None:
+    """The runtime helper method can be used to obtain the Runtimer instance for the
+    specified function, if one is present, allowing access to the most recent function
+    call start and stop time stamps and call duration."""
+
+    if not callable(function):
+        raise TypeError("The 'function' argument must reference a callable!")
+
+    function = unwrap(function)
+
+    logger.debug("runtime(function: %s)" % (function))
+
+    if isinstance(
+        _runtimer := getattr(function, "_classicist_runtimer", None), Runtimer
+    ):
+        return _runtimer
+
+
+def has_runtimer(function: callable) -> bool:
+    """The has_runtimer helper method can be used to determine if the specified function
+    has an associated Runtimer instance or not, returning a boolean to indicate this."""
+
+    if isinstance(getattr(function, "_classicist_runtimer", None), Runtimer):
+        return True
+    else:
+        return False
+
+
+__all__ = [
+    "Runtimer",
+    "runtimer",
+    "runtime",
+    "hasruntimer",
+]
diff --git a/source/classicist/exceptions/__init__.py b/source/classicist/exceptions/__init__.py
@@ -1,4 +1,5 @@
 from classicist.exceptions.decorators import (
+    AliasError,
     AnnotationError,
 )
 
@@ -7,6 +8,7 @@
 )
 
 __all__ = [
+    "AliasError",
     "AnnotationError",
     "AttributeShadowingError",
 ]
diff --git a/source/classicist/version.txt b/source/classicist/version.txt
@@ -1 +1 @@
-1.0.3
+1.0.4