diff --git a/src/PIL/ImageMath.py b/src/PIL/ImageMath.py
index d985877a6..68247c290 100644
--- a/src/PIL/ImageMath.py
+++ b/src/PIL/ImageMath.py
@@ -28,7 +28,7 @@ VERBOSE = 0
 
 
 def _isconstant(v):
-    return isinstance(v, int) or isinstance(v, float)
+    return isinstance(v, (int, float))
 
 
 class _Operand(object):
diff --git a/src/PIL/PdfParser.py b/src/PIL/PdfParser.py
index eca550416..8f90b668d 100644
--- a/src/PIL/PdfParser.py
+++ b/src/PIL/PdfParser.py
@@ -356,8 +356,7 @@ def pdf_repr(x):
         return b"false"
     elif x is None:
         return b"null"
-    elif (isinstance(x, PdfName) or isinstance(x, PdfDict) or
-          isinstance(x, PdfArray) or isinstance(x, PdfBinary)):
+    elif isinstance(x, (PdfName, PdfDict, PdfArray, PdfBinary)):
         return bytes(x)
     elif isinstance(x, int):
         return str(x).encode("us-ascii")