BUG: DataFrame.style displays wrong value for long integers #52272 FIX (#52686)

* BUG: DataFrame.style displays wrong value for long integers #52272. Fixed bug and added test to test_to_html and test_to_latex.

* BUG: DataFrame.style displays wrong value for long integers #52272 add documentation

* BUG: DataFrame.style displays wrong value for long integers #52272 FIX documentation and tests

---------

Co-authored-by: Luciana Solorzano <[email protected]>

Author: lusolorz

doc/source/whatsnew/v2.1.0.rst

@@ -312,6 +312,7 @@ Numeric
 
 Conversion
 ^^^^^^^^^^
+- Bug in :func:`DataFrame.style.to_latex` and :func:`DataFrame.style.to_html` if the DataFrame contains integers with more digits than can be represented by floating point double precision (:issue:`52272`)
 - Bug in :meth:`ArrowDtype.numpy_dtype` returning nanosecond units for non-nanosecond ``pyarrow.timestamp`` and ``pyarrow.duration`` types (:issue:`51800`)
 - Bug in :meth:`DataFrame.info` raising  ``ValueError`` when ``use_numba`` is set (:issue:`51922`)
 -

pandas/io/formats/style_render.py

@@ -1747,7 +1747,7 @@ def _default_formatter(x: Any, precision: int, thousands: bool = False) -> Any:
     if is_float(x) or is_complex(x):
         return f"{x:,.{precision}f}" if thousands else f"{x:.{precision}f}"
     elif is_integer(x):
-        return f"{x:,.0f}" if thousands else f"{x:.0f}"
+        return f"{x:,.0f}" if thousands else str(x)
     return x
 
 

pandas/tests/io/formats/data/html/gh52272_expected_output.html

@@ -0,0 +1,14 @@
+<table border="1" class="dataframe">
+  <thead>
+    <tr style="text-align: right;">
+      <th></th>
+      <th>test</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th>0</th>
+      <td>1234567890123456789</td>
+    </tr>
+  </tbody>
+</table>

pandas/tests/io/formats/test_to_html.py

@@ -896,3 +896,11 @@ def test_to_html_float_format_object_col(datapath):
     result = df.to_html(float_format=lambda x: f"{x:,.0f}")
     expected = expected_html(datapath, "gh40024_expected_output")
     assert result == expected
+
+
+def test_to_html_float_point_double(datapath):
+    # GH#52272
+    df = DataFrame(data=[[1234567890123456789]], columns=["test"])
+    result = df.to_html()
+    expected = expected_html(datapath, "gh52272_expected_output")
+    assert result == expected

pandas/tests/io/formats/test_to_latex.py

@@ -1499,3 +1499,15 @@ def test_get_strrow_multindex_multicolumn(self, row_num, expected):
         )
 
         assert row_string_converter.get_strrow(row_num=row_num) == expected
+
+    def test_to_latex_exceeding_float_point_double(self):
+        df = DataFrame(data=[[1234567890123456789]], columns=["test"])
+        expected = _dedent(
+            r"""
+            \begin{tabular}{lr}
+             & test \\
+            0 & 1234567890123456789 \\
+            \end{tabular}
+            """
+        )
+        assert df.style.to_latex() == expected