perf: a small stage validation optimization

dvc/stage.py

@@ -359,7 +359,7 @@ def update(self):
 
     @staticmethod
     def validate(d, fname=None):
-        from dvc.utils import convert_to_unicode
+        from dvc.utils.compat import convert_to_unicode
 
         try:
             Schema(Stage.SCHEMA).validate(convert_to_unicode(d))

dvc/utils/__init__.py

@@ -292,16 +292,6 @@ def fix_env(env=None):
     return env
 
 
-def convert_to_unicode(data):
-    if isinstance(data, builtin_str):
-        return str(data)
-    if isinstance(data, dict):
-        return dict(map(convert_to_unicode, data.items()))
-    if isinstance(data, (list, tuple)):
-        return type(data)(map(convert_to_unicode, data))
-    return data
-
-
 def tmp_fname(fname):
     """ Temporary name for a partial download """
     return fspath(fname) + "." + str(uuid()) + ".tmp"

dvc/utils/compat.py

@@ -143,6 +143,15 @@ def __enter__(self):
         def __exit__(self, *args):
             self.close()
 
+    def convert_to_unicode(data):
+        if isinstance(data, builtin_str):
+            return str(data)
+        if isinstance(data, dict):
+            return dict(map(convert_to_unicode, data.items()))
+        if isinstance(data, (list, tuple)):
+            return type(data)(map(convert_to_unicode, data))
+        return data
+
 
 elif is_py3:
     import pathlib  # noqa: F401
@@ -170,6 +179,9 @@ def __exit__(self, *args):
     range = range  # noqa: F821
     FileNotFoundError = FileNotFoundError
 
+    def convert_to_unicode(data):
+        return data
+
 
 # Backport os.fspath() from Python 3.6
 try: