compile nth color re; fast path for int in isfinite

eendebakpt · eendebakpt · commit b33ba058a818 · 2023-07-13T15:12:41.000+02:00
diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py
@@ -1635,6 +1635,8 @@ def _safe_first_finite(obj, *, skip_nonfinite=True):
     def safe_isfinite(val):
         if val is None:
             return False
+        if isinstance(val, int):
+            return True
         try:
             return np.isfinite(val) if np.isscalar(val) else True
         except TypeError:
diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
@@ -210,10 +210,11 @@ def _sanitize_extrema(ex):
         ret = float(ex)
     return ret
 
+_nth_color_re = re.compile(r"\AC[0-9]+\Z")
 
 def _is_nth_color(c):
     """Return whether *c* can be interpreted as an item in the color cycle."""
-    return isinstance(c, str) and re.match(r"\AC[0-9]+\Z", c)
+    return isinstance(c, str) and _nth_color_re.match(c)
 
 
 def is_color_like(c):
