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

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

maths/autocorrelation.py

@@ -34,17 +34,17 @@ def autocorrelation(data: list[float], lag: int) -> float:
     if variance == 0:
         raise ValueError("Variance of data is zero, autocorrelation undefined.")
 
-    covariance = sum(
-        (data[i] - mean) * (data[i - lag] - mean)
-        for i in range(lag, n)
-    ) / n
+    covariance = (
+        sum((data[i] - mean) * (data[i - lag] - mean) for i in range(lag, n)) / n
+    )
 
     return covariance / variance
 
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()
     data = [1, 2, 3, 4, 5, 4, 3, 2, 1]
     for lag in range(5):
-        print(f"Lag {lag}: {autocorrelation(data, lag):.4f}")
+        print(f"Lag {lag}: {autocorrelation(data, lag):.4f}")