Fix formatter python compatibility (#3640)

2 files changed, 6 insertions, 2 deletions

diff --git a/dev/format_check.py b/dev/format_check.py
index de099516f..9c2f04066 100644
--- a/dev/format_check.py
+++ b/dev/format_check.py
@@ -45,7 +45,8 @@ if __name__ == "__main__":
                     item["raw_path"],
                 ],
                 encoding="utf-8",
-                capture_output=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
             )
             if run_result.returncode != 0:
                 # erlfmt sometimes returns a non-zero status code with no
diff --git a/dev/format_lib.py b/dev/format_lib.py
index 269311414..454d92120 100644
--- a/dev/format_lib.py
+++ b/dev/format_lib.py
@@ -23,7 +23,10 @@ import subprocess
 
 def get_source_paths():
     for item in subprocess.run(
-        ["git", "ls-files"], encoding="utf-8", capture_output=True
+        ["git", "ls-files"],
+        encoding="utf-8",
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
     ).stdout.split("\n"):
         item_path = pathlib.Path(item)
         if item_path.suffix != ".erl":