BUG: CSS strings truncated at ":" (#59720)

* second item in tuple is no longer truncated at first colon

#59623

* added testcase for maybe_convert_css_to_tuples

#59623

* maybe_convert_css_to_tuples() raises on strings without ":"

* fixed implicit str concatination

* Fixed raise on empty string

* Update test_style.py

* attr:; -> ("attr","")

Same behavior as before patch

* add test for "attr:;", ie empty value

* str concatenation in the test broke mypy

* revert explicit str concat

* Invalidarg patch black (#1)

* black test_style

* Update style_render.py

---------

Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>

Author: invalidarg

pandas/io/formats/style_render.py

@@ -906,9 +906,9 @@ def concatenated_visible_rows(obj):
                 row_body_headers = [
                     {
                         **col,
-                        "display_value": col["display_value"]
-                        if col["is_visible"]
-                        else "",
+                        "display_value": (
+                            col["display_value"] if col["is_visible"] else ""
+                        ),
                         "cellstyle": self.ctx_index[r, c],
                     }
                     for c, col in enumerate(row[:index_levels])
@@ -2069,18 +2069,18 @@ def maybe_convert_css_to_tuples(style: CSSProperties) -> CSSList:
                                              ('border','1px solid red')]
     """
     if isinstance(style, str):
-        s = style.split(";")
-        try:
-            return [
-                (x.split(":")[0].strip(), x.split(":")[1].strip())
-                for x in s
-                if x.strip() != ""
-            ]
-        except IndexError as err:
+        if style and ":" not in style:
             raise ValueError(
                 "Styles supplied as string must follow CSS rule formats, "
                 f"for example 'attr: val;'. '{style}' was given."
-            ) from err
+            )
+        s = style.split(";")
+        return [
+            (x.split(":")[0].strip(), ":".join(x.split(":")[1:]).strip())
+            for x in s
+            if x.strip() != ""
+        ]
+
     return style
 
 

pandas/tests/io/formats/style/test_style.py

@@ -886,8 +886,19 @@ def test_maybe_convert_css_to_tuples(self):
         expected = []
         assert maybe_convert_css_to_tuples("") == expected
 
+        # issue #59623
+        expected = [("a", "b"), ("c", "url('data:123')")]
+        assert maybe_convert_css_to_tuples("a:b;c: url('data:123');") == expected
+
+        # if no value, return attr and empty string
+        expected = [("a", ""), ("c", "")]
+        assert maybe_convert_css_to_tuples("a:;c: ") == expected
+
     def test_maybe_convert_css_to_tuples_err(self):
-        msg = "Styles supplied as string must follow CSS rule formats"
+        msg = (
+            "Styles supplied as string must follow CSS rule formats, "
+            "for example 'attr: val;'. 'err' was given."
+        )
         with pytest.raises(ValueError, match=msg):
             maybe_convert_css_to_tuples("err")