Create speed_conversions.py

conversions/speed_conversions.py

@@ -0,0 +1,70 @@
+"""
+Convert speed units
+
+https://en.wikipedia.org/wiki/Kilometres_per_hour
+https://en.wikipedia.org/wiki/Miles_per_hour
+https://en.wikipedia.org/wiki/Knot_(unit)
+https://en.wikipedia.org/wiki/Metre_per_second
+"""
+
+speed_chart: dict[str, float] = {
+    "km/h": 1.0,
+    "m/s": 3.6,
+    "mph": 1.609344,
+    "knot": 1.852,
+}
+
+speed_chart_inverse: dict[str, float] = {
+    "km/h": 1.0,
+    "m/s": 0.277777778,
+    "mph": 0.621371192,
+    "knot": 0.539956803,
+}
+
+
+def convert_speed(speed: float, unit_from: str, unit_to: str) -> float:
+    """
+    Convert speed from one unit to another using the speed_chart above.
+
+    "km/h": 1.0,
+    "m/s": 3.6,
+    "mph": 1.609344,
+    "knot": 1.852,
+
+    >>> convert_speed(100, "km/h", "m/s")
+    27.778
+    >>> convert_speed(100, "km/h", "mph")
+    62.137
+    >>> convert_speed(100, "km/h", "knot")
+    53.996
+    >>> convert_speed(100, "m/s", "km/h")
+    360.0
+    >>> convert_speed(100, "m/s", "mph")
+    223.694
+    >>> convert_speed(100, "m/s", "knot")
+    194.384
+    >>> convert_speed(100, "mph", "km/h")
+    160.934
+    >>> convert_speed(100, "mph", "m/s")
+    44.704
+    >>> convert_speed(100, "mph", "knot")
+    86.898
+    >>> convert_speed(100, "knot", "km/h")
+    185.2
+    >>> convert_speed(100, "knot", "m/s")
+    51.444
+    >>> convert_speed(100, "knot", "mph")
+    115.078
+    """
+    if unit_to not in speed_chart or unit_from not in speed_chart_inverse:
+        raise ValueError(
+            f"Incorrect 'from_type' or 'to_type' value: {unit_from!r}, {unit_to!r}\n"
+            f"Valid values are: {', '.join(speed_chart_inverse)}"
+        )
+    return round(speed * speed_chart[unit_from] * speed_chart_inverse[unit_to], 3)
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()

conversions/volume_conversions.py

@@ -52,11 +52,7 @@ def volume_conversion(value: float, from_type: str, to_type: str) -> float:
     0.000236588
     >>> volume_conversion(4, "wrongUnit", "litre")
     Traceback (most recent call last):
-      File "/usr/lib/python3.8/doctest.py", line 1336, in __run
-        exec(compile(example.source, filename, "single",
-      File "<doctest __main__.volume_conversion[7]>", line 1, in <module>
-        volume_conversion(4, "wrongUnit", "litre")
-      File "<string>", line 62, in volume_conversion
+        ...
     ValueError: Invalid 'from_type' value: 'wrongUnit'  Supported values are:
     cubicmeter, litre, kilolitre, gallon, cubicyard, cubicfoot, cup
     """