emcee.py: run black

bilby/core/sampler/emcee.py

@@ -332,15 +332,18 @@ class Emcee(MCMCSampler):
 
     def write_chains_to_file(self, sample):
         chain_file = self.checkpoint_info.chain_file
-        temp_chain_file = chain_file + '.temp'
+        temp_chain_file = chain_file + ".temp"
         if self.prerelease:
             points = np.hstack([sample.coords, sample.blobs])
         else:
             points = np.hstack([sample[0], np.array(sample[3])])
-        data_to_write = "\n".join(self.checkpoint_info.chain_template.format(ii, *point) for ii, point in enumerate(points))
+        data_to_write = "\n".join(
+            self.checkpoint_info.chain_template.format(ii, *point)
+            for ii, point in enumerate(points)
+        )
         with open(temp_chain_file, "w") as ff:
             ff.write(data_to_write)
-        with open(temp_chain_file, 'rb') as ftemp, open(chain_file, 'ab') as fchain:
+        with open(temp_chain_file, "rb") as ftemp, open(chain_file, "ab") as fchain:
             shutil.copyfileobj(ftemp, fchain)
         os.remove(temp_chain_file)