Add a class and windchill example.

README.md

@@ -25,3 +25,7 @@ Insure the following dependencies are in place:
 ## Documentation
 
 * [PyO3 Python - Rust bindings](https://pyo3.rs/master/get_started.html)
+* Windchill calculations:
+    * [PDF from US Gov](https://www.weather.gov/media/epz/wxcalc/windChill.pdf)
+    * [Calculation in Celsius and kph](https://www.calcunation.com/calculator/wind-chill-celsius.php)
+    * [Windchill Calculator](https://www.weather.gov/epz/wxcalc_windchill)

src/lib.rs

@@ -5,6 +5,32 @@ extern crate pyo3;
 
 use pyo3::prelude::*;
 
+#[pyclass(module = "unit_converter")]
+struct Temperature {
+    celsius: f32,
+}
+
+#[pymethods]
+impl Temperature {
+    #[new]
+    fn new(obj: &PyRawObject, temperature: f32) {
+        obj.init(Temperature {
+            celsius: temperature,
+        });
+    }
+
+    fn to_fahrenheit(&self) -> f32 {
+        self.celsius * 1.8 + 32.0
+    }
+
+    fn windchill(&self, wind_speed_kph: f32) -> f32 {
+        13.12 + (0.6215 * self.celsius) - (11.37 * wind_speed_kph.powf(0.16))
+            + (0.3965 * self.celsius * wind_speed_kph.powf(0.16))
+    }
+}
+
+// TODO: Add a test that -20 C and 32 kph feels like -32.9
+
 #[pyfunction]
 fn convert_to_fahrenheit(celsius: f32) -> f32 {
     celsius * 1.8 + 32.0
@@ -22,6 +48,7 @@ fn batch_convert_to_fahrenheit(celsius: Vec<f32>) -> Vec<f32> {
 fn unit_converter(_py: Python, m: &PyModule) -> PyResult<()> {
     m.add_wrapped(wrap_pyfunction!(convert_to_fahrenheit))?;
     m.add_wrapped(wrap_pyfunction!(batch_convert_to_fahrenheit))?;
+    m.add_class::<Temperature>()?;
     Ok(())
 }