BUG: styler initialise precision=0 (#43343)

Author: attack68

pandas/io/formats/style_render.py

@@ -108,7 +108,9 @@ def __init__(
         self.cell_context: DefaultDict[tuple[int, int], str] = defaultdict(str)
         self._todo: list[tuple[Callable, tuple, dict]] = []
         self.tooltips: Tooltips | None = None
-        precision = precision or get_option("styler.format.precision")
+        precision = (
+            get_option("styler.format.precision") if precision is None else precision
+        )
         self._display_funcs: DefaultDict[  # maps (row, col) -> formatting function
             tuple[int, int], Callable[[Any], str]
         ] = defaultdict(lambda: partial(_default_formatter, precision=precision))
@@ -1032,7 +1034,9 @@ def _maybe_wrap_formatter(
     elif callable(formatter):
         func_0 = formatter
     elif formatter is None:
-        precision = precision or get_option("styler.format.precision")
+        precision = (
+            get_option("styler.format.precision") if precision is None else precision
+        )
         func_0 = partial(
             _default_formatter, precision=precision, thousands=(thousands is not None)
         )

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

@@ -298,3 +298,10 @@ def test_format_options():
     with option_context("styler.format.formatter", {"int": "{:,.2f}"}):
         ctx_with_op = df.style._translate(True, True)
         assert ctx_with_op["body"][0][1]["display_value"] == "2,000.00"
+
+
+def test_precision_zero(df):
+    styler = Styler(df, precision=0)
+    ctx = styler._translate(True, True)
+    assert ctx["body"][0][2]["display_value"] == "-1"
+    assert ctx["body"][1][2]["display_value"] == "-1"