[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

nbconvert/exporters/slides.py

@@ -41,7 +41,7 @@ def preprocess(self, nb, resources=None):
 
         in_fragment = False
 
-        for index, cell in enumerate(nb.cells[first_slide_ix + 1:], start=(first_slide_ix + 1)):
+        for index, cell in enumerate(nb.cells[first_slide_ix + 1 :], start=(first_slide_ix + 1)):
             previous_cell = nb.cells[index - 1]
 
             # Slides are <section> elements in the HTML, subslides (the vertically

nbconvert/filters/ansi.py

@@ -197,7 +197,7 @@ def _ansi2anything(text, converter):
                     pass  # Invalid color specification
             else:
                 pass  # Not a color code
-            chunk, text = text[: m.start()], text[m.end():]
+            chunk, text = text[: m.start()], text[m.end() :]
         else:
             chunk, text = text, ""
 

nbconvert/filters/citation.py

@@ -42,7 +42,7 @@ def citation2latex(s):
     outtext = ""
     startpos = 0
     for citation in parser.citelist:
-        outtext += s[startpos: citation[1]]
+        outtext += s[startpos : citation[1]]
         outtext += "\\cite{%s}" % citation[0]
         startpos = citation[2] if len(citation) == 3 else -1
     outtext += s[startpos:] if startpos != -1 else ""

nbconvert/filters/markdown_mistune.py

@@ -14,14 +14,14 @@
 import bs4
 import mistune
 from mistune.renderers.markdown import MarkdownRenderer
+from nbformat import NotebookNode
 from pygments import highlight
 from pygments.formatters import HtmlFormatter
 from pygments.lexer import Lexer
 from pygments.lexers import get_lexer_by_name
 from pygments.util import ClassNotFound
 
 from nbconvert.filters.strings import add_anchor
-from nbformat import NotebookNode
 
 try:  # for Mistune >= 3.0
     from mistune import (  # type:ignore[attr-defined]
@@ -386,7 +386,7 @@ def _embed_image_or_attachment(self, src: str) -> str:
 
         attachment_prefix = "attachment:"
         if src.startswith(attachment_prefix):
-            name = src[len(attachment_prefix):]
+            name = src[len(attachment_prefix) :]
 
             if name not in self.attachments:
                 msg = f"missing attachment: {name}"
@@ -528,7 +528,7 @@ def extract_titles_from_notebook_node(nb: NotebookNode):
                 newline = newline.replace("</h4>", "")
                 newline = newline.replace("</h5>", "")
                 newline = newline.replace("</h6>", "")
-            if newline.startswith('#'):
+            if newline.startswith("#"):
                 markdown_collection = markdown_collection + newline.strip() + "\n"
 
     titles_array = []

tests/base.py

@@ -176,15 +176,15 @@ def assert_big_text_equal(a, b, chunk_size=80):
     to give better info than vanilla assertEqual for large text blobs.
     """
     for i in range(0, len(a), chunk_size):
-        chunk_a = a[i: i + chunk_size]
-        chunk_b = b[i: i + chunk_size]
+        chunk_a = a[i : i + chunk_size]
+        chunk_b = b[i : i + chunk_size]
         assert chunk_a == chunk_b, "[offset: %i]\n%r != \n%r" % (i, chunk_a, chunk_b)
 
     if len(a) > len(b):
         raise AssertionError(
-            "Length doesn't match (%i > %i). Extra text:\n%r" % (len(a), len(b), a[len(b):])
+            "Length doesn't match (%i > %i). Extra text:\n%r" % (len(a), len(b), a[len(b) :])
         )
     if len(a) < len(b):
         raise AssertionError(
-            "Length doesn't match (%i < %i). Extra text:\n%r" % (len(a), len(b), a[len(b):])
+            "Length doesn't match (%i < %i). Extra text:\n%r" % (len(a), len(b), a[len(b) :])
         )