fix: Update examples

Author: tmathern

examples/sign_info.py

@@ -94,7 +94,9 @@
 # Sign the image
 print("\nSigning the image...")
 with open(fixtures_dir + "C.jpg", "rb") as source:
-    with open(output_dir + "C_signed.jpg", "wb") as dest:
+    # File needs to be opened in write+read mode to be signed
+    # and verified properly.
+    with open(output_dir + "C_signed.jpg", "w+b") as dest:
         result = builder.sign(signer, "image/jpeg", source, dest)
 
 # Read the signed image to verify

examples/training.py

@@ -122,7 +122,7 @@ def getitem(d, key):
 
     # Sign the file using the stream-based sign method
     with open(testFile, "rb") as source_file:
-        with open(testOutputFile, "wb") as dest_file:
+        with open(testOutputFile, "w+b") as dest_file:
             result = builder.sign(signer, "image/jpeg", source_file, dest_file)
 
     # As an alternative, you can also use file paths directly during signing: