Convert warning to warnings module
diff --git a/Lib/fontTools/ttLib/tables/_h_m_t_x.py b/Lib/fontTools/ttLib/tables/_h_m_t_x.py
index f7ea1e6..a17215f 100644
--- a/Lib/fontTools/ttLib/tables/_h_m_t_x.py
+++ b/Lib/fontTools/ttLib/tables/_h_m_t_x.py
@@ -31,7 +31,7 @@
if sys.byteorder != "big":
sideBearings.byteswap()
if data:
- sys.stderr.write("too much data for hmtx/vmtx table\n")
+ warnings.warn("too much 'hmtx'/'vmtx' table data")
self.metrics = {}
for i in range(numberOfMetrics):
glyphName = ttFont.getGlyphName(i)