Merge branch 'dev'

README.md

@@ -143,6 +143,8 @@ A working example is also given in this [Colab Notebook](https://colab.research.
 
 ## Release History
 
+* 1.0.1
+    * Fixed bug with multicolumn headers missing horizontal and vertical lines. Thanks to [electricbrass](https://github.com/electricbrass).   
 * 1.0.0
     * Added the ability to a list of rows rather than a Texttable object (Texttable is still a requirement).
       Inspired by [latextable-lite](https://github.com/huisyy/latextable-lite) from [Huisyy](https://github.com/huisyy).

examples/basic_examples.py

@@ -15,6 +15,7 @@ def run():
     example_10()
     example_11()
     example_12()
+    example_13()
 
 
 def example_1():
@@ -198,5 +199,22 @@ def example_12():
     print(latextable.draw_latex(rows, use_booktabs=True, alias=alias))
 
 
+def example_13():
+    # Example 13 - Multicolumn header with vertical and horizontal lines
+    rows = [["R", "A", "B", "C", "D"],
+            ["1", "a1", "b1", "c1", "d1"],
+            ["2", "a2", "b2", "c2", "d2"],
+            ["3", "a3", "b3", "c3", "d3"]]
+    multicolumn_header = [("", 1), ("AB", 2), ("CD", 2)]
+
+    table_13 = Texttable()
+    table_13.add_rows(rows)
+    print('\n-- Example 13: Multicolumn header with vertical and horizontal lines --')
+    print('Texttable Output:')
+    print(table_13.draw())
+    print('Latextable Output:')
+    print(latextable.draw_latex(table_13, multicolumn_header=multicolumn_header))
+
+
 if __name__ == "__main__":
     run()

latextable.py

@@ -181,8 +181,9 @@ def _draw_latex_header(table, drop_columns, use_booktabs, multicolumn_header):
 
     # Multicolumn header
     if multicolumn_header is not None:
-        multicolumn_header_str = ["\\multicolumn{{{:d}}}{{c}}{{{:s}}}".format(c, name) for name, c in multicolumn_header]
+        multicolumn_header_str = [f"\\multicolumn{{{count}}}{'{|c|}' if idx == 0 else '{c|}'}{{{name}}}" for idx, (name, count) in enumerate(multicolumn_header)]
         out += _indent_text(" & ".join(multicolumn_header_str) + " \\\\\n", 3)
+        out += _indent_text("\\{}\n".format(rule), 3)
 
     # Normal header
     out += _indent_text(" & ".join(header) + " \\\\\n", 3)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "latextable"
-version = "1.0.0"
+version = "1.0.1"
 authors = [{name = "Joseph Early", email = "[email protected]"}]
 license = {text = "MIT"}
 description = "An extension to the texttable library that exports tables directly to Latex."