Cleanup findnocoding.py and pysource.py scripts (with infile/infile.close)
diff --git a/Tools/scripts/pysource.py b/Tools/scripts/pysource.py
index 7348a68..69e8e0d 100755
--- a/Tools/scripts/pysource.py
+++ b/Tools/scripts/pysource.py
@@ -55,8 +55,8 @@
     if infile is None:
         return False
 
-    line = infile.readline()
-    infile.close()
+    with infile:
+        line = infile.readline()
 
     if binary_re.search(line):
         # file appears to be binary
@@ -76,8 +76,8 @@
     if infile is None:
         return False
 
-    code = infile.read()
-    infile.close()
+    with infile:
+        code = infile.read()
 
     try:
         compile(code, fullpath, "exec")