check PYTHONWARNDEFAULTENCODING

materialsvirtuallab · Dec 20, 2024 · 412c18b · 412c18b
1 parent cb6b560
commit 412c18b
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/src/monty/io.py b/src/monty/io.py
@@ -76,8 +76,12 @@ def zopen(
             stacklevel=2,
         )
 
-    # Warn against default `encoding` in text mode
-    if "t" in mode and kwargs.get("encoding", None) is None:
+    # Warn against default `encoding` in text mode if `PYTHONWARNDEFAULTENCODING` is set
+    if (
+        os.getenv("PYTHONWARNDEFAULTENCODING", False)
+        and "t" in mode
+        and kwargs.get("encoding", None) is None
+    ):
         warnings.warn(
             "We strongly encourage explicit `encoding`, "
             "and we would use UTF-8 by default as per PEP 686",