Update electric_power.py

Author: MaximSmolskiy

electronics/electric_power.py

@@ -23,11 +23,11 @@ def electric_power(voltage: float, current: float, power: float) -> tuple:
     >>> electric_power(voltage=2, current=4, power=2)
     Traceback (most recent call last):
         ...
-    ValueError: Only one argument must be 0
+    ValueError: Exactly one argument must be 0
     >>> electric_power(voltage=0, current=0, power=2)
     Traceback (most recent call last):
         ...
-    ValueError: Only one argument must be 0
+    ValueError: Exactly one argument must be 0
     >>> electric_power(voltage=0, current=2, power=-4)
     Traceback (most recent call last):
         ...
@@ -38,7 +38,7 @@ def electric_power(voltage: float, current: float, power: float) -> tuple:
     Result(name='current', value=3.0)
     """
     if (voltage, current, power).count(0) != 1:
-        raise ValueError("Only one argument must be 0")
+        raise ValueError("Exactly one argument must be 0")
     elif power < 0:
         raise ValueError(
             "Power cannot be negative in any electrical/electronics system"
@@ -49,8 +49,6 @@ def electric_power(voltage: float, current: float, power: float) -> tuple:
         return Result("current", power / voltage)
     elif power == 0:
         return Result("power", float(round(abs(voltage * current), 2)))
-    else:
-        raise ValueError("Exactly one argument must be 0")
 
 
 if __name__ == "__main__":