Fixed import issue

Author: rads-1996

opentelemetry-api/src/opentelemetry/attributes/__init__.py

@@ -17,10 +17,16 @@
 from collections import OrderedDict
 from collections.abc import MutableMapping
 from typing import Mapping, Optional, Sequence, Tuple, Union
-import django
-from django.core.handlers.wsgi import WSGIRequest
 from opentelemetry.util import types
 
+# Optional Django imports - only available if Django is installed
+try:
+    from django.core.handlers.wsgi import WSGIRequest
+    _HAS_DJANGO = True
+except ImportError:
+    WSGIRequest = None  # type: ignore
+    _HAS_DJANGO = False
+
 # bytes are accepted as a user supplied value for attributes but
 # decoded to strings internally.
 _VALID_ATTR_VALUE_TYPES = (bool, str, bytes, int, float)
@@ -34,8 +40,7 @@
     str,
     Sequence,
     Mapping,
-    WSGIRequest,
-)
+) + ((WSGIRequest,) if _HAS_DJANGO else ())
 
 
 _logger = logging.getLogger(__name__)
@@ -130,7 +135,7 @@ def _clean_extended_attribute_value(
             value = value[:max_len]
         return value
 
-    if isinstance(value, WSGIRequest):
+    if _HAS_DJANGO and WSGIRequest is not None and isinstance(value, WSGIRequest):
         wsgi_data = {
             "method": getattr(value, "method", None),
             "path": getattr(value, "path", None),