Support grouping in Tick formatter based on locale.

z0rgy · QuLogic · commit 6d3de0cc3c28 · 2020-09-08T23:48:30.000-04:00
When formatting and setting useLocale to True, the numbers greater than
1000 are not grouped as specified by the locale. 1000 should be 1,000 in
certain locales. By setting the last argument to locale.format_string
the locale dependent grouping is honored.
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -647,7 +647,7 @@ def __call__(self, x, pos=None):
             if abs(xp) < 1e-8:
                 xp = 0
             if self._useLocale:
-                s = locale.format_string(self.format, (xp,))
+                s = locale.format_string(self.format, (xp,), True)
             else:
                 s = self.format % xp
             return self.fix_minus(s)
