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

pre-commit-ci[bot] · pre-commit-ci[bot] · commit 08fe78c7242a · 2022-11-03T13:16:42.000Z
for more information, see https://pre-commit.ci
diff --git a/janitor/functions/concatenate_columns.py b/janitor/functions/concatenate_columns.py
@@ -53,10 +53,7 @@ def concatenate_columns(
 
     df = df.copy()  # avoid mutating original data
     df[new_column_name] = (
-        df[column_names]
-        .astype("string")
-        .fillna("")
-        .agg(sep.join, axis=1)
+        df[column_names].astype("string").fillna("").agg(sep.join, axis=1)
     )
 
     if ignore_empty:
