implemented additionally functionality of formatters_col in to_latex

doc/source/whatsnew/v1.2.0.rst

@@ -1,3 +1,4 @@
+
 .. _whatsnew_120:
 
 What's new in 1.2.0 (??)
@@ -435,6 +436,18 @@ ExtensionArray
 - Fixed bug where ``astype()`` with equal dtype and ``copy=False`` would return a new object (:issue:`284881`)
 -
 
+ToLatex
+^^^^^^^
+
+- Can now substitute simple fstrings in place of callable functions in to_latex
+
+.. ipython:: python
+
+    data = [[1, 2, 3], [4, 5, 6], [7, 8, 9.001]]
+    df = pd.DataFrame(data, columns=["a", "b", "c"], 
+        index=["foo", "bar", "foobar"])
+    result = df.to_latex(formatters=["d", ".2f", lambda x: f"{x:.3f}"])
+
 
 Other
 ^^^^^

pandas/core/generic.py

@@ -3017,7 +3017,7 @@ def to_latex(
             Write row names (index).
         na_rep : str, default 'NaN'
             Missing data representation.
-        formatters : list of functions or dict of {{str: function}}, optional
+        formatters : list of functions/str or dict of {{str: function}}, optional
             Formatter functions to apply to columns' elements by position or
             name. The result of each function must be a unicode string.
             List must be of length equal to the number of columns.
@@ -3112,6 +3112,22 @@ def to_latex(
         if multirow is None:
             multirow = config.get_option("display.latex.multirow")
 
+        if is_list_like(formatters) and not isinstance(formatters, dict):
+            formatter_elems_type = all(
+                isinstance(elem, str) or callable(elem) for elem in formatters
+            )
+            if formatter_elems_type:
+                formatters = [
+                    (lambda style: lambda x: "{0:{1}}".format(x, style))(style)
+                    if isinstance(style, str)
+                    else style
+                    for style in formatters
+                ]
+            else:
+                raise ValueError(
+                    "Formatters elements should be f-strings or callable functions"
+                )
+
         formatter = DataFrameFormatter(
             self,
             columns=columns,

pandas/tests/io/formats/test_to_latex.py

@@ -174,6 +174,24 @@ def test_to_latex_midrule_location(self):
         )
         assert result == expected
 
+    def test_to_latex_with_float_format_list(self):
+        # GH: 26278
+        data = [[1, 2, 3], [4, 5, 6], [7, 8, 9.001]]
+        df = DataFrame(data, columns=["a", "b", "c"], index=["foo", "bar", "foobar"])
+
+        result = df.to_latex(formatters=["d", ".2f", lambda x: f"{x:.3f}"])
+        expected = r"""\begin{tabular}{lrrr}
+\toprule
+{} & a &    b &     c \\
+\midrule
+foo    & 1 & 2.00 & 3.000 \\
+bar    & 4 & 5.00 & 6.000 \\
+foobar & 7 & 8.00 & 9.001 \\
+\bottomrule
+\end{tabular}
+"""
+        assert result == expected
+
 
 class TestToLatexLongtable:
     def test_to_latex_empty_longtable(self):