Implement FileNotFoundError handling to not crash

main.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from bitstring import ConstBitStream
 from src.sms import *
 from src.contacts import *
@@ -8,14 +9,18 @@ def input_file():
     return filename
 
 def main():
-    ## Prompt user to specify file from path (DOES NOT HANDLE ERRORS PROPERLY)
+    ## Prompt user to specify file from path 
     file = input_file()
     while file == "":
         print("Enter valid path to file")
         file = input_file()
 
-    ## Print file size
-    file_size_bytes = os.path.getsize(file)
+    ## Print file size (if file exists)
+    try: 
+        file_size_bytes = os.path.getsize(file)
+    except FileNotFoundError:
+        print("File does not exist, try again.")
+        sys.exit(1)
     print(f'File size: {file_size_bytes} bytes') 
     print("*****************************************************************")