diff --git a/chapter_six/constructing_our_own_python_objects/Cargo.toml b/chapter_six/constructing_our_own_python_objects/Cargo.toml
index 9a883d6..4ddbd09 100644
--- a/chapter_six/constructing_our_own_python_objects/Cargo.toml
+++ b/chapter_six/constructing_our_own_python_objects/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 
 [dependencies.pyo3]
-version = "0.13.2"
+version = "0.16.6"
 features = ["extension-module"]
 
 [lib]
diff --git a/chapter_six/constructing_our_own_python_objects/src/class_module/fib_processor.rs b/chapter_six/constructing_our_own_python_objects/src/class_module/fib_processor.rs
index ef12eb3..1b32574 100644
--- a/chapter_six/constructing_our_own_python_objects/src/class_module/fib_processor.rs
+++ b/chapter_six/constructing_our_own_python_objects/src/class_module/fib_processor.rs
@@ -1,9 +1,8 @@
-use pyo3::prelude::{pyclass, pymethods, staticmethod};
+use pyo3::prelude::{pyclass, pymethods};
 
 use crate::fib_calcs::fib_number::fibonacci_number;
 use crate::fib_calcs::fib_numbers::fibonacci_numbers;
 
-
 #[pyclass]
 pub struct FibProcessor {
     #[pyo3(get, set)]
@@ -13,37 +12,33 @@ pub struct FibProcessor {
     #[pyo3(get)]
     pub number_results: Vec<u64>,
     #[pyo3(get)]
-    pub numbers_results: Vec<Vec<u64>>
+    pub numbers_results: Vec<Vec<u64>>,
 }
 
 #[pymethods]
 impl FibProcessor {
-
     #[new]
     fn new(number: Vec<i32>, numbers: Vec<Vec<i32>>) -> Self {
         let input_numbers: Vec<Vec<i32>> = numbers.clone();
         let input_number: Vec<i32> = number.clone();
 
-        let number_results: Vec<u64> = input_number.iter(
-                                        ).map(
-            |x| fibonacci_number(*x)
-        ).collect();
+        let number_results: Vec<u64> = input_number.iter().map(|x| fibonacci_number(*x)).collect();
 
-        let numbers_results: Vec<Vec<u64>> = Self::
-                             process_numbers(input_numbers);
-        return FibProcessor {number, numbers,
-                             number_results, numbers_results}
+        let numbers_results: Vec<Vec<u64>> = Self::process_numbers(input_numbers);
+        return FibProcessor {
+            number,
+            numbers,
+            number_results,
+            numbers_results,
+        };
     }
 
-
     #[staticmethod]
-    fn process_numbers(input_numbers: Vec<Vec<i32>>)
-                                           -> Vec<Vec<u64>> {
+    fn process_numbers(input_numbers: Vec<Vec<i32>>) -> Vec<Vec<u64>> {
         let mut buffer: Vec<Vec<u64>> = Vec::new();
         for i in input_numbers {
             buffer.push(fibonacci_numbers(i));
         }
-        return buffer
+        return buffer;
     }
 }
-
diff --git a/chapter_six/constructing_our_own_python_objects/src/interface/config.rs b/chapter_six/constructing_our_own_python_objects/src/interface/config.rs
index 13aa23e..a13896b 100644
--- a/chapter_six/constructing_our_own_python_objects/src/interface/config.rs
+++ b/chapter_six/constructing_our_own_python_objects/src/interface/config.rs
@@ -1,65 +1,53 @@
+use pyo3::exceptions::PyTypeError;
 use pyo3::prelude::{pyfunction, PyResult};
 use pyo3::types::{PyDict, PyList};
-use pyo3::exceptions::PyTypeError;
 
 use crate::fib_calcs::fib_number::fibonacci_number;
 use crate::fib_calcs::fib_numbers::fibonacci_numbers;
 
-
-fn process_numbers(input_numbers: Vec<Vec<i32>>)
-                                            -> Vec<Vec<u64>> {
+fn process_numbers(input_numbers: Vec<Vec<i32>>) -> Vec<Vec<u64>> {
     let mut buffer: Vec<Vec<u64>> = Vec::new();
     for i in input_numbers {
         buffer.push(fibonacci_numbers(i));
     }
-    return buffer
+    return buffer;
 }
 
-
 #[pyfunction]
 pub fn run_config<'a>(config: &'a PyDict) -> PyResult<&'a PyDict> {
-
     match config.get_item("number") {
-        Some(data) => {
-            match data.downcast::<PyList>() {
-                Ok(raw_data) => {
-                    let processed_results: Vec<i32> =
-                    raw_data.extract::<Vec<i32>>().unwrap();
-                    let fib_numbers: Vec<u64> =
-                    processed_results.iter().map(
-                        |x| fibonacci_number(*x)
-                    ).collect();
-                    config.set_item(
-                    "NUMBER RESULT", fib_numbers);
-                },
-                Err(_) => Err(PyTypeError::new_err(
-                    "parameter number is not a list
-                    of integers")).unwrap()
+        Some(data) => match data.downcast::<PyList>() {
+            Ok(raw_data) => {
+                let processed_results: Vec<i32> = raw_data.extract::<Vec<i32>>().unwrap();
+                let fib_numbers: Vec<u64> = processed_results
+                    .iter()
+                    .map(|x| fibonacci_number(*x))
+                    .collect();
+                config.set_item("NUMBER RESULT", fib_numbers)?;
             }
+            Err(_) => Err(PyTypeError::new_err(
+                "parameter number is not a list
+                    of integers",
+            ))
+            .unwrap(),
         },
-        None => println!(
-        "parameter number is not in the config"
-        )
+        None => println!("parameter number is not in the config"),
     }
 
     match config.get_item("numbers") {
-        Some(data) => {
-            match data.downcast::<PyList>() {
-                Ok(raw_data) => {
-                    let processed_results_two: Vec<Vec<i32>> =
-                    raw_data.extract::<Vec<Vec<i32>>>(
-                    ).unwrap();
-                    config.set_item("NUMBERS RESULT",
-                    process_numbers(processed_results_two));
-                },
-                Err(_) => Err(PyTypeError::new_err(
-                "parameter numbers is not a list of lists of
-                integers")).unwrap()
+        Some(data) => match data.downcast::<PyList>() {
+            Ok(raw_data) => {
+                let processed_results_two: Vec<Vec<i32>> =
+                    raw_data.extract::<Vec<Vec<i32>>>().unwrap();
+                config.set_item("NUMBERS RESULT", process_numbers(processed_results_two))?;
             }
-
+            Err(_) => Err(PyTypeError::new_err(
+                "parameter numbers is not a list of lists of
+                integers",
+            ))
+            .unwrap(),
         },
-        None => println!(
-        "parameter numbers is not in the config")
+        None => println!("parameter numbers is not in the config"),
     }
-    return Ok(config)
-}
\ No newline at end of file
+    return Ok(config);
+}
diff --git a/chapter_six/constructing_our_own_python_objects/src/lib.rs b/chapter_six/constructing_our_own_python_objects/src/lib.rs
index 4a02533..cb354e4 100644
--- a/chapter_six/constructing_our_own_python_objects/src/lib.rs
+++ b/chapter_six/constructing_our_own_python_objects/src/lib.rs
@@ -1,29 +1,26 @@
 use pyo3::prelude::*;
 use pyo3::wrap_pyfunction;
 
-mod interface;
-mod fib_calcs;
 mod class_module;
+mod fib_calcs;
+mod interface;
 
-use fib_calcs::fib_number::__pyo3_get_function_fibonacci_number;
-use fib_calcs::fib_numbers::__pyo3_get_function_fibonacci_numbers;
-use interface::config::__pyo3_get_function_run_config;
 use class_module::fib_processor::FibProcessor;
-
-
+use fib_calcs::fib_number::fibonacci_number;
+use fib_calcs::fib_numbers::fibonacci_numbers;
+use interface::config::run_config;
 
 #[pyfunction]
 fn say_hello() {
     println!("saying hello from Rust!");
 }
 
-
 #[pymodule]
 fn flitton_fib_rs(_py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(say_hello));
-    m.add_wrapped(wrap_pyfunction!(fibonacci_number));
-    m.add_wrapped(wrap_pyfunction!(fibonacci_numbers));
-    m.add_wrapped(wrap_pyfunction!(run_config));
+    m.add_wrapped(wrap_pyfunction!(say_hello))?;
+    m.add_wrapped(wrap_pyfunction!(fibonacci_number))?;
+    m.add_wrapped(wrap_pyfunction!(fibonacci_numbers))?;
+    m.add_wrapped(wrap_pyfunction!(run_config))?;
     m.add_class::<FibProcessor>()?;
     Ok(())
 }
diff --git a/chapter_six/inspecting_python_objects/Cargo.toml b/chapter_six/inspecting_python_objects/Cargo.toml
index 9a883d6..4ddbd09 100644
--- a/chapter_six/inspecting_python_objects/Cargo.toml
+++ b/chapter_six/inspecting_python_objects/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 
 [dependencies.pyo3]
-version = "0.13.2"
+version = "0.16.6"
 features = ["extension-module"]
 
 [lib]
diff --git a/chapter_six/inspecting_python_objects/src/interface/config.rs b/chapter_six/inspecting_python_objects/src/interface/config.rs
index 13aa23e..a13896b 100644
--- a/chapter_six/inspecting_python_objects/src/interface/config.rs
+++ b/chapter_six/inspecting_python_objects/src/interface/config.rs
@@ -1,65 +1,53 @@
+use pyo3::exceptions::PyTypeError;
 use pyo3::prelude::{pyfunction, PyResult};
 use pyo3::types::{PyDict, PyList};
-use pyo3::exceptions::PyTypeError;
 
 use crate::fib_calcs::fib_number::fibonacci_number;
 use crate::fib_calcs::fib_numbers::fibonacci_numbers;
 
-
-fn process_numbers(input_numbers: Vec<Vec<i32>>)
-                                            -> Vec<Vec<u64>> {
+fn process_numbers(input_numbers: Vec<Vec<i32>>) -> Vec<Vec<u64>> {
     let mut buffer: Vec<Vec<u64>> = Vec::new();
     for i in input_numbers {
         buffer.push(fibonacci_numbers(i));
     }
-    return buffer
+    return buffer;
 }
 
-
 #[pyfunction]
 pub fn run_config<'a>(config: &'a PyDict) -> PyResult<&'a PyDict> {
-
     match config.get_item("number") {
-        Some(data) => {
-            match data.downcast::<PyList>() {
-                Ok(raw_data) => {
-                    let processed_results: Vec<i32> =
-                    raw_data.extract::<Vec<i32>>().unwrap();
-                    let fib_numbers: Vec<u64> =
-                    processed_results.iter().map(
-                        |x| fibonacci_number(*x)
-                    ).collect();
-                    config.set_item(
-                    "NUMBER RESULT", fib_numbers);
-                },
-                Err(_) => Err(PyTypeError::new_err(
-                    "parameter number is not a list
-                    of integers")).unwrap()
+        Some(data) => match data.downcast::<PyList>() {
+            Ok(raw_data) => {
+                let processed_results: Vec<i32> = raw_data.extract::<Vec<i32>>().unwrap();
+                let fib_numbers: Vec<u64> = processed_results
+                    .iter()
+                    .map(|x| fibonacci_number(*x))
+                    .collect();
+                config.set_item("NUMBER RESULT", fib_numbers)?;
             }
+            Err(_) => Err(PyTypeError::new_err(
+                "parameter number is not a list
+                    of integers",
+            ))
+            .unwrap(),
         },
-        None => println!(
-        "parameter number is not in the config"
-        )
+        None => println!("parameter number is not in the config"),
     }
 
     match config.get_item("numbers") {
-        Some(data) => {
-            match data.downcast::<PyList>() {
-                Ok(raw_data) => {
-                    let processed_results_two: Vec<Vec<i32>> =
-                    raw_data.extract::<Vec<Vec<i32>>>(
-                    ).unwrap();
-                    config.set_item("NUMBERS RESULT",
-                    process_numbers(processed_results_two));
-                },
-                Err(_) => Err(PyTypeError::new_err(
-                "parameter numbers is not a list of lists of
-                integers")).unwrap()
+        Some(data) => match data.downcast::<PyList>() {
+            Ok(raw_data) => {
+                let processed_results_two: Vec<Vec<i32>> =
+                    raw_data.extract::<Vec<Vec<i32>>>().unwrap();
+                config.set_item("NUMBERS RESULT", process_numbers(processed_results_two))?;
             }
-
+            Err(_) => Err(PyTypeError::new_err(
+                "parameter numbers is not a list of lists of
+                integers",
+            ))
+            .unwrap(),
         },
-        None => println!(
-        "parameter numbers is not in the config")
+        None => println!("parameter numbers is not in the config"),
     }
-    return Ok(config)
-}
\ No newline at end of file
+    return Ok(config);
+}
diff --git a/chapter_six/inspecting_python_objects/src/interface/mod.rs b/chapter_six/inspecting_python_objects/src/interface/mod.rs
index 5b43afb..d922f48 100644
--- a/chapter_six/inspecting_python_objects/src/interface/mod.rs
+++ b/chapter_six/inspecting_python_objects/src/interface/mod.rs
@@ -1,2 +1,2 @@
 pub mod config;
-pub mod config;
+pub mod object;
diff --git a/chapter_six/inspecting_python_objects/src/lib.rs b/chapter_six/inspecting_python_objects/src/lib.rs
index 2e5a89e..580080e 100644
--- a/chapter_six/inspecting_python_objects/src/lib.rs
+++ b/chapter_six/inspecting_python_objects/src/lib.rs
@@ -1,21 +1,19 @@
 use pyo3::prelude::*;
 use pyo3::wrap_pyfunction;
 
-mod interface;
 mod fib_calcs;
+mod interface;
 
-use fib_calcs::fib_number::__pyo3_get_function_fibonacci_number;
-use fib_calcs::fib_numbers::__pyo3_get_function_fibonacci_numbers;
-use interface::config::__pyo3_get_function_run_config;
-use interface::object::__pyo3_get_function_object_interface;
-
+use fib_calcs::fib_number::fibonacci_number;
+use fib_calcs::fib_numbers::fibonacci_numbers;
+use interface::config::run_config;
+use interface::object::object_interface;
 
 #[pyfunction]
 fn say_hello() {
     println!("saying hello from Rust!");
 }
 
-
 #[pymodule]
 fn flitton_fib_rs(_py: Python, m: &PyModule) -> PyResult<()> {
     m.add_wrapped(wrap_pyfunction!(say_hello));