diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 37c4d8ec2..456d2672f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -51,6 +51,23 @@ repos:
       # - id: sort-simple-yaml
       - id: trailing-whitespace
 
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.33.0
+    hooks:
+      - id: markdownlint
+        args: ["--disable", "MD013"]
+
+  # - repo: https://github.com/markdownlint/markdownlint
+  #   rev: v0.12.0
+  #   hooks:
+  #     - id: markdownlint
+
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: "v0.0.257"
+    hooks:
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+
   - repo: https://github.com/asottile/add-trailing-comma
     rev: v2.4.0
     hooks:
@@ -141,16 +158,5 @@ repos:
   #    hooks:
   #      - id: codespell
 
-  - repo: https://github.com/igorshubovych/markdownlint-cli
-    rev: v0.33.0
-    hooks:
-      - id: markdownlint
-        args: ["--disable", "MD013"]
-
-  # - repo: https://github.com/markdownlint/markdownlint
-  #   rev: v0.12.0
-  #   hooks:
-  #     - id: markdownlint
-
 default_language_version:
   python: python3.10
diff --git a/chapters/translations/1_download.py b/chapters/translations/1_download.py
index a3c8d9426..4ad07ed01 100755
--- a/chapters/translations/1_download.py
+++ b/chapters/translations/1_download.py
@@ -24,7 +24,7 @@ def download_file(url: str, filepath: str):
     Download file from url to filepath.
     """
     headers = {
-        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 ",
+        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 ",  # noqa: E501
     }
     cont = requests.get(url, headers=headers, verify=True, timeout=3).content
     # verify=False -> skip SSL cert verification: CERTIFICATE_VERIFY_FAILED
@@ -32,7 +32,7 @@ def download_file(url: str, filepath: str):
         fh.write(cont)
 
 
-def download_all_chapters():
+def download_all_chapters() -> None:
     """
     Download all chapters.
 
diff --git a/chapters/translations/3_clean.py b/chapters/translations/3_clean.py
index 3df2dd062..f78c6232b 100755
--- a/chapters/translations/3_clean.py
+++ b/chapters/translations/3_clean.py
@@ -37,11 +37,6 @@ def html_modify():
     for translator in translators:
         print("===" + translator + "===")
 
-        # fhAll = open(
-        #     f"4-join/hpmor-{translator}.html", mode="w", encoding="utf-8", newline="\n"
-        # )
-        # fhAll.write(html_start)
-
         for fileIn in sorted(glob.glob(f"2-extract/{translator}/*.html")):
             (filePath, fileName) = os.path.split(fileIn)
             fileOut = f"3-clean/{translator}/{fileName}"
@@ -74,10 +69,6 @@ def html_modify():
                 fh.write(html_start)
                 fh.write(out)
                 fh.write(html_end)
-            # fhAll.write(out)
-            # break
-        # fhAll.write(html_end)
-        # fhAll.close()
 
 
 def html_tuning(s: str) -> str:
diff --git a/scripts/check_chapters.py b/scripts/check_chapters.py
index 630430d9e..bd6aed88c 100755
--- a/scripts/check_chapters.py
+++ b/scripts/check_chapters.py
@@ -131,7 +131,7 @@ def process_file(file_in: Path) -> bool:
                 encoding="utf-8",
             ) as file2:
                 diff = difflib.ndiff(file1.readlines(), file2.readlines())
-            delta = "".join(l for l in diff if l.startswith("+ ") or l.startswith("- "))
+            delta = "".join(x for x in diff if x.startswith("+ ") or x.startswith("- "))
             print(file_in.name + "\n" + delta)
 
     return issues_found
diff --git a/scripts/compare-translations.py b/scripts/compare-translations.py
index 24b328c36..c0d34bab0 100755
--- a/scripts/compare-translations.py
+++ b/scripts/compare-translations.py
@@ -59,7 +59,7 @@ def download_file(url: str, filepath: str):
     Download file from url to filepath.
     """
     headers = {
-        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 ",
+        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 ",  # noqa: E501
     }
     cont = requests.get(url, headers=headers, verify=True, timeout=3).content
     # verify=False -> skip SSL cert verification: CERTIFICATE_VERIFY_FAILED
@@ -69,7 +69,7 @@ def download_file(url: str, filepath: str):
 
 # TODO: FR uses master as branch name
 def download_all_chapters():
-    baseurl = "https://raw.githubusercontent.com/<<repo>>/main/chapters/hpmor-chapter-<<chapter-no>>.tex"
+    baseurl = "https://raw.githubusercontent.com/<<repo>>/main/chapters/hpmor-chapter-<<chapter-no>>.tex"  # noqa: E501
 
     # for lang in translations.keys():
     lang = other_lang
diff --git a/scripts/ebook/6.py b/scripts/ebook/6.py
index ba824613d..3f7beb4fb 100755
--- a/scripts/ebook/6.py
+++ b/scripts/ebook/6.py
@@ -38,7 +38,7 @@
 
 # remove duplication of author name
 cont = re.sub(
-    r"""<p>Fanfiction.*?<p>Basierend auf der Harry Potter Reihe von J. K. Rowling.*?</p>""",
+    r"""<p>Fanfiction.*?<p>Basierend auf der Harry Potter Reihe von J. K. Rowling.*?</p>""",  # noqa: E501
     "<p>Fanfiction basierend auf der Harry Potter Reihe von J. K. Rowling</p>",
     cont,
     flags=re.DOTALL | re.IGNORECASE,
diff --git a/scripts/ebook/v1/1_latex2html.py b/scripts/ebook/v1/1_latex2html.py
index aeabead22..f5de32ee9 100755
--- a/scripts/ebook/v1/1_latex2html.py
+++ b/scripts/ebook/v1/1_latex2html.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 # by Torben Menke https://entorb.net
+# flake8: noqa
 """
 Converter script.