Fix: Ensure ScalarFormatter.set_useOffset properly distinguishes betw… (matplotlib#29537)

* Fix: Ensure ScalarFormatter.set_useOffset properly distinguishes between booleans and numeric values

* fix: flake8 lint issue

---------

Co-authored-by: masih.khatibzdeh <[email protected]>

Author: masihkhatibzadeh99

lib/matplotlib/tests/test_ticker.py

@@ -859,6 +859,22 @@ def test_set_use_offset_float(self):
         assert not tmp_form.get_useOffset()
         assert tmp_form.offset == 0.5
 
+    def test_set_use_offset_bool(self):
+        tmp_form = mticker.ScalarFormatter()
+        tmp_form.set_useOffset(True)
+        assert tmp_form.get_useOffset()
+        assert tmp_form.offset == 0
+
+        tmp_form.set_useOffset(False)
+        assert not tmp_form.get_useOffset()
+        assert tmp_form.offset == 0
+
+    def test_set_use_offset_int(self):
+        tmp_form = mticker.ScalarFormatter()
+        tmp_form.set_useOffset(1)
+        assert not tmp_form.get_useOffset()
+        assert tmp_form.offset == 1
+
     def test_use_locale(self):
         conv = locale.localeconv()
         sep = conv['thousands_sep']

lib/matplotlib/ticker.py

@@ -510,7 +510,7 @@ def set_useOffset(self, val):
         will be formatted as ``0, 2, 4, 6, 8`` plus an offset ``+1e5``, which
         is written to the edge of the axis.
         """
-        if val in [True, False]:
+        if isinstance(val, bool):
             self.offset = 0
             self._useOffset = val
         else: