Added __str__ methods to some units.

cyclinglib/energy.py

@@ -24,6 +24,9 @@ class Energy:
         """
         return self.kilocalories()
 
+    def __str__(self) -> str:
+        return f"J: {self.joules()} kJ: {self.kilojoules()} kcal: {self.kcal()}"
+
 
 def calculate_energy(force: Force, distance: Length) -> Energy:
     joules = force.newtons() * distance.metre()

cyclinglib/force.py

@@ -13,6 +13,9 @@ class Force:
     def kilonewtons(self) -> float:
         return self._newtons / 1_000
 
+    def __str__(self) -> str:
+        return f"N: {self.newtons()} kN: {self.kilonewtons()}"
+
 
 def calculate_force(power: Power, speed: Speed):
     newtons: float = power.watts() * speed.meters_per_second()

cyclinglib/length.py

@@ -17,3 +17,6 @@ class Length:
 
     def miles(self) -> float:
         return self._metre * 0.000621371192
+
+    def __str__(self) -> str:
+        return f"m: {self.metre()} km: {self.metre()} mi: {self.miles()}"

cyclinglib/power.py

@@ -13,6 +13,9 @@ class Power:
     def kilowatts(self) -> float:
         return self._watts / 1_000
 
+    def __str__(self) -> str:
+        return f"W: {self.watts()}"
+
 
 def calculate_power(force: Force, speed: Speed) -> Power:
     watts = force.newtons() * speed.meters_per_second()