[26660] compare int with double by subtracting during describe percentiles formatting

Author: jkovacevic

pandas/io/formats/format.py

@@ -1246,7 +1246,7 @@ def format_percentiles(percentiles):
             raise ValueError("percentiles should all be in the interval [0,1]")
 
     percentiles = 100 * percentiles
-    int_idx = (percentiles.astype(int) == percentiles)
+    int_idx = ((percentiles.astype(int) - percentiles) < 1e-4)
 
     if np.all(int_idx):
         out = percentiles.astype(int).astype(str)

pandas/tests/io/formats/test_format.py

@@ -2729,6 +2729,11 @@ def test_format_percentiles():
     expected = ['0%', '50%', '2.0%', '50%', '66.67%', '99.99%']
     assert result == expected
 
+    result = fmt.format_percentiles(np.linspace(0, 1, 10 + 1))
+    expected = ['0%', '10%', '20%', '30%', '40%', '50%',
+                '60%', '70%', '80%', '90%', '100%']
+    assert result == expected
+
     msg = r"percentiles should all be in the interval \[0,1\]"
     with pytest.raises(ValueError, match=msg):
         fmt.format_percentiles([0.1, np.nan, 0.5])