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Code block- try: with open(vm_log_filename, 'r') as input_file, open(filename, 'w') as output_file: # Using itertools.islice to copy lines between start and end indexes output_file.writelines(itertools.islice(input_file, X - 1, Y)) #Counting the number of lines in file with open(filename,'r') as output_file: line_count=len(output_file.readlines()) print("Number of lines in the output file:", line_count) logging.info("Number of lines in the output file %d ",line_count) except Exception as e: print("Exception while copying lines to file:", e) logging.error("Exception while copying lines to file: %s",e) return None # Updating the last index in a Bookmark File print("Updating the last index in a Bookmark File") bookmark_record = syslog_record print(f"Bookmark Record for {i} is {bookmark_record}") print(f"Updating Bookmark record for {bookmark_record}") updated_bookmark_index = int(old_line_number) + int(line_count) updated_bookmark_rec = f"{bookmark_record}{updated_bookmark_rec}\n" print(updated_bookmark_rec) logging.info("Updated Bookmark Index %d ",updated_bookmark_rec) Output/Error- Bookmark Record 172.19.5.134_bookmark_log=1 Old line number from bookmark file is : 1 Value of New Line Number is : 10001 172.19.5.134_bookmark_log= VM Log FIle : /syslog/anewavqasapweb01-172.19.5.134.log Content for nth line : 2023-08-20T02:35:45+00:00 anewavqasapweb01 zypper_log: 2023-08-20 02:35:36 <1> anewavqasapweb01(18993) [zypp++] RepoInfo.cc(probeCache):64 Probed cached type NONE at 172.19.5.134-T2023-08-21-11-30-02.txt New Value is 10001 Number of lines in the output file: 10001 Updating the last index in a Bookmark File Bookmark Record for 245 is 172.19.5.134_bookmark_log= Updating Bookmark record for 172.19.5.134_bookmark_log= Error in perform_functions_with_bookmark_record function: local variable 'updated_bookmark_rec' referenced before assignment --- Logging error --- Traceback (most recent call last): File "Dataflow_syslog_postgre.py", line 227, in perform_functions_with_bookmark_record copying_loglines_and_updating_bookmark(bookmark_record, syslog_record_no, i, number_of_lines) File "Dataflow_syslog_postgre.py", line 292, in copying_loglines_and_updating_bookmark updated_bookmark_rec = f"{bookmark_record}{updated_bookmark_rec}\n" UnboundLocalError: local variable 'updated_bookmark_rec' referenced before assignment During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/lib64/python3.6/logging/__init__.py", line 994, in emit msg = self.format(record) File "/usr/lib64/python3.6/logging/__init__.py", line 840, in format return fmt.format(record) File "/usr/lib64/python3.6/logging/__init__.py", line 577, in format record.message = record.getMessage() File "/usr/lib64/python3.6/logging/__init__.py", line 338, in getMessage msg = msg % self.args TypeError: not all arguments converted during string formatting Call stack: File "Dataflow_syslog_postgre.py", line 362, in <module> check_log_enable() File "Dataflow_syslog_postgre.py", line 163, in check_log_enable check_bookmark_record(vm_id) File "Dataflow_syslog_postgre.py", line 190, in check_bookmark_record perform_functions_with_bookmark_record(bookmark_line, i) File "Dataflow_syslog_postgre.py", line 230, in perform_functions_with_bookmark_record logging.error("Error in perform_functions_with_bookmark_record function:", e) Message: 'Error in perform_functions_with_bookmark_record function:' Arguments: (UnboundLocalError("local variable 'updated_bookmark_rec' referenced before assignment",),) 2 problems here- 1. we are not getting print("Number of lines in the output file:", line_count) here the line count even on adding print statement. 2. Logging error