style: format code with Black

This commit fixes the style issues introduced in 1413838 according to the output
from Black.

Details: https://github.com/MilesCranmer/PySR/pull/564

pysr/julia_extensions.py

@@ -1,4 +1,5 @@
 """This file installs and loads extensions for SymbolicRegression."""
+
 from .julia_import import jl
 
 

pysr/sr.py

@@ -1,4 +1,5 @@
 """Define the PySRRegressor scikit-learn interface."""
+
 import copy
 import os
 import pickle as pkl
@@ -1659,9 +1660,9 @@ class PySRRegressor(MultiOutputMixin, RegressorMixin, BaseEstimator):
             fraction_replaced_hof=self.fraction_replaced_hof,
             should_simplify=self.should_simplify,
             should_optimize_constants=self.should_optimize_constants,
-            warmup_maxsize_by=0.0
-            if self.warmup_maxsize_by is None
-            else self.warmup_maxsize_by,
+            warmup_maxsize_by=(
+                0.0 if self.warmup_maxsize_by is None else self.warmup_maxsize_by
+            ),
             use_frequency=self.use_frequency,
             use_frequency_in_tournament=self.use_frequency_in_tournament,
             adaptive_parsimony_scaling=self.adaptive_parsimony_scaling,
@@ -1743,9 +1744,11 @@ class PySRRegressor(MultiOutputMixin, RegressorMixin, BaseEstimator):
             ),
             y_variable_names=jl_y_variable_names,
             X_units=jl_array(self.X_units_),
-            y_units=jl_array(self.y_units_)
-            if isinstance(self.y_units_, list)
-            else self.y_units_,
+            y_units=(
+                jl_array(self.y_units_)
+                if isinstance(self.y_units_, list)
+                else self.y_units_
+            ),
             options=options,
             numprocs=cprocs,
             parallelism=parallelism,