Add Python to Rust example

python-to-rust/Cargo.toml

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+[package]
+name = "python-to-rust"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+
+[lib]
+name = "double_input"
+crate-type = ["dylib"]

python-to-rust/Makefile

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+all: target/libdouble_input.so
+	python src/main.py
+
+target/libdouble_input.so: src/lib.rs Cargo.toml
+	cargo build
+	(cd target && ln -nsf debug/libdouble_input-* libdouble_input.so)
+
+clean:
+	rm -rf target

python-to-rust/src/lib.rs

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+#[no_mangle]
+pub extern fn double_input(input: i32) -> i32 {
+    input * 2
+}

python-to-rust/src/main.py

@@ -0,0 +1,8 @@
+from ctypes import cdll
+
+lib = cdll.LoadLibrary('target/libdouble_input.so')
+double_input = lib.double_input
+
+input = 4
+output = double_input(input)
+print(str(input) + " * 2 = " + str(output))