adds error handling and writes a tad safer

xlstojson.py

@@ -1,19 +1,24 @@
 #!/usr/bin/python3.10
-import json
-import os.path
+import json, os, sys
 from xlsx_reader import get_workbook, get_workbook_data
 
 def main():
     ''' The CLI / output task. '''
-    filename = input("Enter the path to the filename -> ")
-    if os.path.isfile(filename):
-        workbook = get_workbook(filename)
-        workbook_data = get_workbook_data(workbook)
-        output = \
-		open((filename.replace("xlsx", "json")).replace("xls", "json"), "w+", encoding="utf-8")
-        output.write(json.dumps(workbook_data, sort_keys=True, indent=2,  separators=(',', ": ")))
-        output.close()
-        print (f"{output.name} was created")
+    source_file = input("Enter the path to the filename -> ")
+    if os.path.isfile(source_file):
+        pathname = os.path.splitext(source_file)
+        file_name = pathname[0].split('/')[-1]
+        try:
+            output_file_name = file_name + '.json'
+            workbook = get_workbook(source_file)
+            workbook_data = get_workbook_data(workbook)
+            with open(output_file_name, 'w+', encoding="utf-8") as output_file:
+                output_file.write(json.dumps(workbook_data, sort_keys=True, indent=2, separators=(",", ": ")))
+                print (f"{output_file.name} was created")
+        except Exception as error:
+            print("some error occured")
+            print(error)
+            sys.exit(2)
     else:
         print ("Sorry, that was not a valid filename")