bpo-29762: More use "raise from None". (#569)

This hides unwanted implementation details from tracebacks.

2 files changed, 4 insertions, 4 deletions

diff --git a/Tools/freeze/winmakemakefile.py b/Tools/freeze/winmakemakefile.py
index 9bb3e6e..e283848 100644
--- a/Tools/freeze/winmakemakefile.py
+++ b/Tools/freeze/winmakemakefile.py
@@ -39,7 +39,7 @@ def get_custom_entry_point(subsystem):
     try:
         return subsystem_details[subsystem][:2]
     except KeyError:
-        raise ValueError("The subsystem %s is not known" % subsystem)
+        raise ValueError("The subsystem %s is not known" % subsystem) from None
 
 
 def makemakefile(outfp, vars, files, target):
diff --git a/Tools/pynche/ColorDB.py b/Tools/pynche/ColorDB.py
index 0348148..eb76d40 100644
--- a/Tools/pynche/ColorDB.py
+++ b/Tools/pynche/ColorDB.py
@@ -87,7 +87,7 @@ class ColorDB:
         try:
             return self.__byrgb[rgbtuple]
         except KeyError:
-            raise BadColor(rgbtuple)
+            raise BadColor(rgbtuple) from None
 
     def find_byname(self, name):
         """Return (red, green, blue) for name"""
@@ -95,7 +95,7 @@ class ColorDB:
         try:
             return self.__byname[name]
         except KeyError:
-            raise BadColor(name)
+            raise BadColor(name) from None
 
     def nearest(self, red, green, blue):
         """Return the name of color nearest (red, green, blue)"""
@@ -128,7 +128,7 @@ class ColorDB:
         try:
             name, aliases = self.__byrgb[(red, green, blue)]
         except KeyError:
-            raise BadColor((red, green, blue))
+            raise BadColor((red, green, blue)) from None
         return [name] + aliases