Simplify backend_ps._nums_to_str.

anntzer · anntzer · commit 651df81e620b · 2021-07-30T12:11:21.000+02:00
_num_to_str is never used by itself and can be folded into the plural
version.  It is never called with a str argument so that check can be
removed.  Exact integer arguments can also be directly handled by the
floating-point handling path (Technically, this will cause a rounding
error for integers greater than `2**53`, but the PostScript standard
only supports 32-bit integers anyways); the performance cost should be
negligible (in fact, possibly more than compensated by the removal of
the instance check in the common case of float arguments).
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -88,22 +88,8 @@ def _get_papertype(w, h):
     return 'a0'
 
 
-def _num_to_str(val):
-    if isinstance(val, str):
-        return val
-
-    ival = int(val)
-    if val == ival:
-        return str(ival)
-
-    s = "%1.3f" % val
-    s = s.rstrip("0")
-    s = s.rstrip(".")
-    return s
-
-
 def _nums_to_str(*args):
-    return ' '.join(map(_num_to_str, args))
+    return " ".join(f"{arg:1.3f}".rstrip("0").rstrip(".") for arg in args)
 
 
 def quote_ps_string(s):
