Lazily import bleach HTML sanitizer (#6179)

panel/util/__init__.py

@@ -23,7 +23,6 @@
 from importlib import import_module
 from typing import Any, AnyStr
 
-import bleach
 import bokeh
 import numpy as np
 import param
@@ -51,7 +50,23 @@
 
 PARAM_NAME_PATTERN = re.compile(r'^.*\d{5}$')
 
-HTML_SANITIZER = bleach.sanitizer.Cleaner(strip=True)
+class LazyHTMLSanitizer:
+    """
+    Wraps bleach.sanitizer.Cleaner lazily importing it on the first
+    call to the clean method.
+    """
+
+    def __init__(self, **kwargs):
+        self._cleaner = None
+        self._kwargs = kwargs
+
+    def clean(self, text):
+        if self._cleaner is None:
+            import bleach
+            self._cleaner = bleach.sanitizer.Cleaner(**self._kwargs)
+        return self._cleaner.clean(text)
+
+HTML_SANITIZER = LazyHTMLSanitizer(strip=True)
 
 
 def hashable(x):
@@ -87,8 +102,6 @@ def param_name(name: str) -> str:
     return name[:name.index(match[0])] if match else name
 
 
-
-
 def abbreviated_repr(value, max_length=25, natural_breaks=(',', ' ')):
     """
     Returns an abbreviated repr for the supplied object. Attempts to

pyproject.toml

@@ -6,7 +6,6 @@ requires = [
     "bokeh >=3.3.0,<3.4.0",
     "pyviz_comms >=0.7.4",
     "requests",
-    "bleach",
     "packaging",
     "tqdm >=4.48.0",
     "markdown",