clearer error messages

src/arraytex/api.py

@@ -41,10 +41,10 @@ def to_matrix(
     if len(arr.shape) > 2:
         raise TooManyDimensionsError
 
-    environment = f"{style}matrix"
-
     lines = _parse_lines(arr, num_format, scientific_notation)
 
+    environment = f"{style}matrix"
+
     rv = [f"\\begin{{{environment}}}"]
     rv += [line.strip() + r" \\" for line in lines]
     rv += [f"\\end{{{environment}}}"]
@@ -96,17 +96,17 @@ def to_tabular(
 
     if isinstance(col_align, list) and len(col_align) != n_cols:
         raise DimensionMismatchError(
-            "Number of `col_align` items doesn't match number of columns "
-            + f"({len(col_align)} against {n_cols})"
+            f"Number of `col_align` items ({len(col_align)}) "
+            + f"doesn't match number of columns ({n_cols})"
         )
 
     if isinstance(col_align, str):
         col_align = [col_align for _ in range(n_cols)]
 
     if cols and len(cols) != n_cols:
         raise DimensionMismatchError(
-            "Number of `cols` items doesn't match number of columns "
-            + f"({len(cols)} against {n_cols})"
+            f"Number of `cols` items ({len(cols)}) "
+            + f"doesn't match number of columns ({n_cols})"
         )
 
     if not cols:

tests/test_api.py

@@ -5,8 +5,8 @@
 import numpy as np
 import pytest
 
-from arraytex.api import to_matrix
-from arraytex.api import to_tabular
+from arraytex import to_matrix
+from arraytex import to_tabular
 from arraytex.errors import DimensionMismatchError
 from arraytex.errors import TooManyDimensionsError
 
@@ -176,8 +176,7 @@ def test_mismatch_col_align(self) -> None:
             to_tabular(mat, col_align=["c", "c"])
 
         assert str(exc.value) == (
-            "Number of `col_align` items doesn't match number of "
-            + "columns (2 against 3)"
+            "Number of `col_align` items (2) doesn't match number of columns (3)"
         )
 
     def test_mismatch_cols(self) -> None:
@@ -188,7 +187,7 @@ def test_mismatch_cols(self) -> None:
             to_tabular(mat, cols=["1", "2"])
 
         assert str(exc.value) == (
-            "Number of `cols` items doesn't match number of " + "columns (2 against 3)"
+            "Number of `cols` items (2) doesn't match number of columns (3)"
         )
 
     def test_default(self) -> None: