ruff rule PLR1714 Consider merging multiple comparisons

Author: cclauss

web_programming/emails_from_url.py

@@ -31,12 +31,7 @@ def handle_starttag(self, tag: str, attrs: list[tuple[str, str | None]]) -> None
             # Check the list of defined attributes.
             for name, value in attrs:
                 # If href is defined, not empty nor # print it and not already in urls.
-                if (
-                    name == "href"
-                    and value != "#"
-                    and value != ""
-                    and value not in self.urls
-                ):
+                if name == "href" and value not in set(self.urls + ["", "#"]):
                     url = parse.urljoin(self.domain, value)
                     self.urls.append(url)