BUG: set_precision format fixed (pandas-dev#13257)

Co-Authored-By: Tom Augspurger <[email protected]>

conflit whatsnew

conflit whatsnew

testes

Author: AntonioAndraues

doc/source/whatsnew/v1.0.0.rst

@@ -263,6 +263,7 @@ Other
 - Using :meth:`DataFrame.replace` with overlapping keys in a nested dictionary will no longer raise, now matching the behavior of a flat dictionary (:issue:`27660`)
 - :meth:`DataFrame.to_csv` and :meth:`Series.to_csv` now support dicts as ``compression`` argument with key ``'method'`` being the compression method and others as additional compression options when the compression method is ``'zip'``. (:issue:`26023`)
 - :meth:`Series.append` will no longer raise a ``TypeError`` when passed a tuple of ``Series`` (:issue:`28410`)
+- Bug in :meth:`pandas.io.formats.style.Styler` formatting for floating values not displaying decimals correctly (:issue:`13257`)
 
 .. _whatsnew_1000.contributors:
 

pandas/io/formats/style.py

@@ -151,7 +151,8 @@ def __init__(
 
         def default_display_func(x):
             if is_float(x):
-                return "{:>.{precision}g}".format(x, precision=self.precision)
+                display_format = "{0:.{precision}f}".format(x, precision=self.precision)
+                return display_format
             else:
                 return x
 

pandas/tests/io/formats/test_style.py

@@ -1157,6 +1157,32 @@ def test_display_format_raises(self):
         with pytest.raises(TypeError):
             df.style.format(True)
 
+    def test_display_set_precision(self):
+        df = pd.DataFrame(data=[[1.0, 2.0090], [3.2121, 4.566]], columns=["a", "b"])
+        s = Styler(df)
+
+        ctx = s.set_precision(1)._translate()
+
+        assert s.precision == 1
+        assert ctx["body"][0][1]["display_value"] == "1.0"
+        assert ctx["body"][0][2]["display_value"] == "2.0"
+        assert ctx["body"][1][1]["display_value"] == "3.2"
+        assert ctx["body"][1][2]["display_value"] == "4.6"
+
+        ctx = s.set_precision(2)._translate()
+        assert s.precision == 2
+        assert ctx["body"][0][1]["display_value"] == "1.00"
+        assert ctx["body"][0][2]["display_value"] == "2.01"
+        assert ctx["body"][1][1]["display_value"] == "3.21"
+        assert ctx["body"][1][2]["display_value"] == "4.57"
+
+        ctx = s.set_precision(3)._translate()
+        assert s.precision == 3
+        assert ctx["body"][0][1]["display_value"] == "1.000"
+        assert ctx["body"][0][2]["display_value"] == "2.009"
+        assert ctx["body"][1][1]["display_value"] == "3.212"
+        assert ctx["body"][1][2]["display_value"] == "4.566"
+
     def test_display_subset(self):
         df = pd.DataFrame([[0.1234, 0.1234], [1.1234, 1.1234]], columns=["a", "b"])
         ctx = df.style.format(