Apply formatting fixes from linter

- Fix formatting in test_html.py
- Fix formatting in test_offline.py
- Fix formatting in _html.py

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ddworken

plotly/io/_html.py

@@ -14,9 +14,9 @@
 def _generate_sri_hash(content):
     """Generate SHA256 hash for SRI (Subresource Integrity)"""
     if isinstance(content, str):
-        content = content.encode('utf-8')
+        content = content.encode("utf-8")
     sha256_hash = hashlib.sha256(content).digest()
-    return 'sha256-' + base64.b64encode(sha256_hash).decode('utf-8')
+    return "sha256-" + base64.b64encode(sha256_hash).decode("utf-8")
 
 
 # Build script to set global PlotlyConfig object. This must execute before
@@ -265,14 +265,14 @@ def to_html(
         # Generate SRI hash from the bundled plotly.js content
         plotlyjs_content = get_plotlyjs()
         sri_hash = _generate_sri_hash(plotlyjs_content)
-        
+
         load_plotlyjs = """\
         {win_config}
         <script charset="utf-8" src="{cdn_url}" integrity="{integrity}" crossorigin="anonymous"></script>\
     """.format(
-            win_config=_window_plotly_config, 
+            win_config=_window_plotly_config,
             cdn_url=plotly_cdn_url(),
-            integrity=sri_hash
+            integrity=sri_hash,
         )
 
     elif include_plotlyjs == "directory":

tests/test_core/test_offline/test_offline.py

@@ -37,9 +37,7 @@
 <script type="text/javascript">\
 window.PlotlyConfig = {MathJaxConfig: 'local'};</script>"""
 
-cdn_script = '<script charset="utf-8" src="{cdn_url}"'.format(
-    cdn_url=plotly_cdn_url()
-)
+cdn_script = '<script charset="utf-8" src="{cdn_url}"'.format(cdn_url=plotly_cdn_url())
 
 directory_script = '<script charset="utf-8" src="plotly.min.js"></script>'
 

tests/test_io/test_html.py

@@ -53,32 +53,40 @@ def test_html_deterministic(fig1):
 def test_cdn_includes_integrity_attribute(fig1):
     """Test that the CDN script tag includes an integrity attribute with SHA256 hash"""
     html_output = pio.to_html(fig1, include_plotlyjs="cdn")
-    
+
     # Check that the script tag includes integrity attribute
     assert 'integrity="sha256-' in html_output
     assert 'crossorigin="anonymous"' in html_output
-    
+
     # Verify it's in the correct script tag
     import re
-    cdn_pattern = re.compile(r'<script[^>]*src="' + re.escape(plotly_cdn_url()) + r'"[^>]*integrity="sha256-[A-Za-z0-9+/=]+"[^>]*>')
+
+    cdn_pattern = re.compile(
+        r'<script[^>]*src="'
+        + re.escape(plotly_cdn_url())
+        + r'"[^>]*integrity="sha256-[A-Za-z0-9+/=]+"[^>]*>'
+    )
     match = cdn_pattern.search(html_output)
     assert match is not None, "CDN script tag with integrity attribute not found"
 
 
 def test_cdn_integrity_hash_matches_bundled_content(fig1):
     """Test that the SRI hash in CDN script tag matches the bundled plotly.js content"""
     html_output = pio.to_html(fig1, include_plotlyjs="cdn")
-    
+
     # Extract the integrity hash from the HTML output
     import re
+
     integrity_pattern = re.compile(r'integrity="(sha256-[A-Za-z0-9+/=]+)"')
     match = integrity_pattern.search(html_output)
     assert match is not None, "Integrity attribute not found"
     extracted_hash = match.group(1)
-    
+
     # Generate expected hash from bundled content
     plotlyjs_content = get_plotlyjs()
     expected_hash = _generate_sri_hash(plotlyjs_content)
-    
+
     # Verify they match
-    assert extracted_hash == expected_hash, f"Hash mismatch: expected {expected_hash}, got {extracted_hash}"
+    assert (
+        extracted_hash == expected_hash
+    ), f"Hash mismatch: expected {expected_hash}, got {extracted_hash}"