[pre-commit.ci] auto fixes from pre-commit.com hooks

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electronics/star_delta_conversions.py

@@ -1,52 +1,49 @@
 # https://www.electrical4u.com/delta-star-transformation-star-delta-transformation/#:~:text=The%20relation%20of%20delta%20%E2%80%93%20star,of%20the%20delta%20connected%20resistances.
 # https://en.wikipedia.org/wiki/Y-%CE%94_transform
 
+
 def star_to_delta(
- resistor_a: float, resistor_b: float, resistor_c: float,
-)->list[float]:
-
-
- """
-
- Convert's star resistor arrangment to delta 
-
- >>> star_to_delta(5,7.5,3.0)
- [15.0, 10.0, 25.0]
- >>> star_to_delta(5,75,12)
- [267.0, 17.8, 111.25]
- >>> star_to_delta(-5,75,12)
- Traceback (most recent call last):
- ...
- ValueError: resistance value is zero or negative
- """
-
-
- if (
- resistor_a <= 0
- or resistor_b <= 0
- or resistor_c <= 0
- ):
- raise ValueError("resistance value is zero or negative")
-
- delta_arrangment = []
- resistance_chain = resistor_a * resistor_b + resistor_b * resistor_c + resistor_c * resistor_a
- delta_arrangment.append(resistance_chain / resistor_a)
- delta_arrangment.append(resistance_chain / resistor_b)
- delta_arrangment.append(resistance_chain / resistor_c)
+ resistor_a: float,
+ resistor_b: float,
+ resistor_c: float,
+) -> list[float]:
+ """
+
+ Convert's star resistor arrangment to delta
 
- return delta_arrangment
+ >>> star_to_delta(5,7.5,3.0)
+ [15.0, 10.0, 25.0]
+ >>> star_to_delta(5,75,12)
+ [267.0, 17.8, 111.25]
+ >>> star_to_delta(-5,75,12)
+ Traceback (most recent call last):
+ ...
+ ValueError: resistance value is zero or negative
+ """
 
+ if resistor_a <= 0 or resistor_b <= 0 or resistor_c <= 0:
+ raise ValueError("resistance value is zero or negative")
 
+ delta_arrangment = []
+ resistance_chain = (
+ resistor_a * resistor_b + resistor_b * resistor_c + resistor_c * resistor_a
+ )
+ delta_arrangment.append(resistance_chain / resistor_a)
+ delta_arrangment.append(resistance_chain / resistor_b)
+ delta_arrangment.append(resistance_chain / resistor_c)
 
-def delta_to_star(
- resistor_a: float, resistor_b: float, resistor_c: float,
-)->list[float]:
+ return delta_arrangment
 
 
+def delta_to_star(
+ resistor_a: float,
+ resistor_b: float,
+ resistor_c: float,
+) -> list[float]:
  """
 
  Convert's delta resistor arrangment to star
- 
+
  Exaples:
  >>> delta_to_star(10,25,15)
  [5.0, 7.5, 3.0]
@@ -58,23 +55,19 @@ def delta_to_star(
  ValueError: resistance value is zero or negative
  """
 
- if (
- resistor_a <= 0
- or resistor_b <= 0
- or resistor_c <= 0
- ):
+ if resistor_a <= 0 or resistor_b <= 0 or resistor_c <= 0:
  raise ValueError("resistance value is zero or negative")
 
  star_arrangment = []
- resistance_sum  = resistor_a + resistor_b + resistor_c
- star_arrangment.append( ( resistor_a * resistor_b ) / resistance_sum )
- star_arrangment.append( ( resistor_b * resistor_c ) / resistance_sum )
- star_arrangment.append( ( resistor_c * resistor_a ) / resistance_sum )
+ resistance_sum = resistor_a + resistor_b + resistor_c
+ star_arrangment.append((resistor_a * resistor_b) / resistance_sum)
+ star_arrangment.append((resistor_b * resistor_c) / resistance_sum)
+ star_arrangment.append((resistor_c * resistor_a) / resistance_sum)
 
  return star_arrangment
 
 
 if __name__ == "__main__":
  import doctest
 
- doctest.testmod()
+ doctest.testmod()