diff --git a/PyLTSpice/sim/sim_batch.py b/PyLTSpice/sim/sim_batch.py
index c96537c..8788d65 100644
--- a/PyLTSpice/sim/sim_batch.py
+++ b/PyLTSpice/sim/sim_batch.py
@@ -221,7 +221,7 @@ def failSim(self):
         raw, log = LTC.run().wait_results()
         _logger.debug(f"Raw file '{raw}' | Log File '{log}'")
     # Sim Statistics
-    _logger.info('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+    _logger.info(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
 
 
     def callback_function(raw_file, log_file):
diff --git a/README.md b/README.md
index 5a254ca..217376d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # README #
 
-_Current Version 5.4.5_ 
+_Current Version 5.5.0_ 
 
 PyLTSpice is a toolchain of python utilities design to interact with LTSpice Electronic Simulator.
 It is mostly based on the spicelib package, being the main difference to it is 
@@ -184,7 +184,7 @@ netlist.add_instructions(
 )
 
 # Sim Statistics
-print('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+print(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
 
 enter = input("Press enter to delete created files")
 if enter == '':
@@ -460,6 +460,10 @@ _Make sure to initialize the root logger before importing the library to be able
 For support and improvement requests please open an Issue in [GitHub spicelib issues](https://github.com/nunobrum/spicelib/issues)
 
 ## History ##
+* Version 5.5.0 (spicelib 1.5.0)
+  * Dropping support for Python 3.9
+    * Using f-strings across the entire codebase
+    * Using the new union type hinting syntax across the entire codebase
 * Version 5.4.5 (spicelib 1.4.7)
   * Implementing a lazy loading approach in RawRead 
   * Fixing Issue #256 - Correct add_component() in SpiceEditor
diff --git a/doc/modules/run_simulations.rst b/doc/modules/run_simulations.rst
index fde1566..03dfb2c 100644
--- a/doc/modules/run_simulations.rst
+++ b/doc/modules/run_simulations.rst
@@ -103,7 +103,7 @@ each executing in parallel a simulation. This is exemplified in the modified exa
     # The timeout counter is reset everytime a simulation is finished.
     
     # Sim Statistics
-    print('Successful/Total Simulations: ' + str(runner.okSim) + '/' + str(runner.runno))
+    print(f'Successful/Total Simulations: {runner.okSim}/{runner.runno}')
 
 If the ``parallel_sims`` parallel simulations is not given, it defaults to 4. This means that a fifth simulation
 will only start when one of the other 4 is finished. If ``parallel_sims`` needs to be adjusted according to the
diff --git a/examples/raw_plotting.py b/examples/raw_plotting.py
index 348de32..128e3ca 100644
--- a/examples/raw_plotting.py
+++ b/examples/raw_plotting.py
@@ -1,7 +1,6 @@
 import sys
 import matplotlib.pyplot as plt
 import os
-from os.path import split as pathsplit
 from os.path import join as pathjoin
 import numpy as np
 from numpy import abs as mag, angle
@@ -31,14 +30,16 @@ def what_to_units(whattype):
     # filename = 'AC.raw'
     # filename = 'AC - STEP.raw'
     # filename = 'DC op point - STEP.raw'
-    trace_names = ("V(out)",)
+    # trace_names = ("V(out)",)
     filename = 'Noise.raw'
     trace_names = ("V(onoise)",)
     raw_filename = pathjoin(test_directory, filename)
 
 LTR = RawRead(raw_filename, trace_names, verbose=True)
+# Calculate field width from the longest parameter name so the colon lines up vertically
+field_width = max((len(str(p)) for p in LTR.raw_params.keys()), default=0)
 for param, value in LTR.raw_params.items():
-    print("{}: {}{}".format(param, " " * (20 - len(param)), str(value).strip()))
+    print(f"{param:<{field_width}}: {value}")
 
 if trace_names == '*':
     print("Reading all the traces in the raw file")
diff --git a/examples/sim_runner_asc_example.py b/examples/sim_runner_asc_example.py
index 5b95af7..a45dfef 100644
--- a/examples/sim_runner_asc_example.py
+++ b/examples/sim_runner_asc_example.py
@@ -1,7 +1,7 @@
 from PyLTSpice import SimRunner
 from PyLTSpice import AscEditor
 
-# Force another simulatior
+# Force another simulator
 simulator = r"C:\Program Files\LTC\LTspiceXVII\XVIIx64.exe"
 
 # select spice model
@@ -36,7 +36,7 @@
     # ...
 
 # Sim Statistics
-print('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+print(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
 
 enter = input("Press enter to delete created files")
 if enter == '':
diff --git a/examples/sim_runner_callback_example.py b/examples/sim_runner_callback_example.py
index de5af3a..e3f46b4 100644
--- a/examples/sim_runner_callback_example.py
+++ b/examples/sim_runner_callback_example.py
@@ -71,4 +71,8 @@ def processing_data(raw_file, log_file):
     results = runner.wait_completion(1, abort_all_on_timeout=True)
 
     # Sim Statistics
-    print('Successful/Total Simulations: ' + str(runner.okSim) + '/' + str(runner.runno))
+    print(f'Successful/Total Simulations: {runner.okSim}/{runner.runno}')
+
+enter = input("Press enter to delete created files")
+if enter == '':
+    runner.file_cleanup()
diff --git a/examples/sim_runner_callback_process_example.py b/examples/sim_runner_callback_process_example.py
index 5e54897..726cf0a 100644
--- a/examples/sim_runner_callback_process_example.py
+++ b/examples/sim_runner_callback_process_example.py
@@ -59,6 +59,10 @@ def callback(raw_file, log_file):
     results = runner.wait_completion(1, abort_all_on_timeout=True)
 
     # Sim Statistics
-    print('Successful/Total Simulations: ' + str(runner.okSim) + '/' + str(runner.runno))
+    print(f'Successful/Total Simulations: {runner.okSim}/{runner.runno}')
+    
+    enter = input("Press enter to delete created files")
+    if enter == '':
+        runner.file_cleanup()
 
 
diff --git a/examples/sim_runner_example.py b/examples/sim_runner_example.py
index 35a0173..30e7ee7 100644
--- a/examples/sim_runner_example.py
+++ b/examples/sim_runner_example.py
@@ -44,7 +44,7 @@
 )
 
 # Sim Statistics
-print('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+print(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
 
 enter = input("Press enter to delete created files")
 if enter == '':
diff --git a/examples/sim_stepper_example.py b/examples/sim_stepper_example.py
index 7f4525b..61623f4 100644
--- a/examples/sim_stepper_example.py
+++ b/examples/sim_stepper_example.py
@@ -32,5 +32,5 @@ def processing_data(raw_file, log_file):
 Stepper.run_all(callback=processing_data)
 
 # Sim Statistics
-print('Successful/Total Simulations: ' + str(Stepper.okSim) + '/' + str(Stepper.runno))
+print(f'Successful/Total Simulations: {Stepper.okSim}/{Stepper.runno}')
 runner.file_cleanup()
diff --git a/pyproject.toml b/pyproject.toml
index 257b463..93b897d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ requires = [
 build-backend = "setuptools.build_meta"
 [project]
 name = "PyLTSpice"
-version = "5.4.5"
+version = "5.5.0"
 authors = [
   { name="Nuno Brum", email="me@nunobrum.com" },
 ]
diff --git a/unittests/test_pyltspice.py b/unittests/test_pyltspice.py
index 24ad496..5872ffd 100644
--- a/unittests/test_pyltspice.py
+++ b/unittests/test_pyltspice.py
@@ -112,7 +112,7 @@ def processing_data(raw_file, log_file):
         LTC.wait_completion()
 
         # Sim Statistics
-        print('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+        print(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
         self.assertEqual(LTC.okSim, 6)
         self.assertEqual(LTC.runno, 6)
 
@@ -161,7 +161,7 @@ def test_run_from_spice_editor(self):
             raw, log = LTC.run(netlist).wait_results()
             print(f"Raw file '{raw}' | Log File '{log}'")
         # Sim Statistics
-        print('Successful/Total Simulations: ' + str(LTC.okSim) + '/' + str(LTC.runno))
+        print(f'Successful/Total Simulations: {LTC.okSim}/{LTC.runno}')
 
     @unittest.skipIf(skip_ltspice_tests, "Skip if not in windows environment")
     def test_sim_runner(self):