[bugfix] Fix TypeError in colors.py with backports.batched

Bug: T362035
Change-Id: I68d7a7c3451fce91e13385a57138c0ed50f26d64
Signed-off-by: Xqt <info@gno.de>
---
M pywikibot/backports.py
M scripts/maintenance/colors.py
2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/pywikibot/backports.py b/pywikibot/backports.py
index 155effd..8b9d989 100644
--- a/pywikibot/backports.py
+++ b/pywikibot/backports.py
@@ -177,9 +177,13 @@
         :param strict: raise a ValueError if the final batch is shorter
             than *n*.
         :raise ValueError: batched(): incomplete batch
+        :raise TypeError: *n* cannot be interpreted as an integer
         """
         msg = 'batched(): incomplete batch'
         if PYTHON_VERSION < (3, 12):
+            if not isinstance(n, int):
+                raise TypeError(f'{type(n),__name__!r} object cannot be'
+                                ' interpreted as an integer')
             group = []
             for item in iterable:
                 group.append(item)
diff --git a/scripts/maintenance/colors.py b/scripts/maintenance/colors.py
index bf73742..63c46a5 100755
--- a/scripts/maintenance/colors.py
+++ b/scripts/maintenance/colors.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """Utility to show pywikibot colors."""
 #
-# (C) Pywikibot team, 2016-2023
+# (C) Pywikibot team, 2016-2024
 #
 # Distributed under the terms of the MIT license.
 #
@@ -17,10 +17,8 @@
     fg_colors = [col for col in colors if col != 'default']
     bg_colors = fg_colors[:]
     n_fg_colors = len(fg_colors)
-    fg_colors.insert(3 * int(n_fg_colors / 4), 'default')
-    fg_colors.insert(2 * int(n_fg_colors / 4), 'default')
-    fg_colors.insert(int(n_fg_colors / 4), 'default')
-    fg_colors.insert(0, 'default')
+    for i in range(4):
+        fg_colors.insert((3 - i) * (n_fg_colors // 4), 'default')
 
     # Max len of color names for padding.
     max_len_fg_colors = len(max(fg_colors, key=len))
@@ -28,7 +26,7 @@
 
     for bg_col in bg_colors:
         # Three lines per each backgoung color.
-        for fg_col_group in batched(fg_colors, n_fg_colors / 4 + 1):
+        for fg_col_group in batched(fg_colors, n_fg_colors // 4 + 1):
             line = ''
             for fg_col in fg_col_group:
                 line += ' '

