TR updates, first round

Author: lpozo

python-while-loop/check_file.py

@@ -10,6 +10,6 @@
     time.sleep(1)
 
 print(f"{filename} found! Proceeding with processing.")
-with open(filename) as file:
+with open(filename, mode="r") as file:
     print("File contents:")
     print(file.read())