diff --git a/Cargo.lock b/Cargo.lock
index 6d0b48b..79929bf 100644
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@@ -128,8 +915,110 @@
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+dependencies = [
+ "autocfg",
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@@ -174,16 +1100,116 @@
  "libc",
  "redox_syscall",
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- "windows-sys",
+ "windows-sys 0.42.0",
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@@ -217,14 +1243,23 @@
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+
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- "clap",
+ "clap 4.0.26",
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@@ -239,6 +1274,52 @@
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@@ -385,18 +2470,44 @@
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+ "windows_x86_64_msvc 0.39.0",
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+ "windows_i686_gnu 0.36.1",
+ "windows_i686_msvc 0.36.1",
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- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
+ "windows_aarch64_msvc 0.42.0",
+ "windows_i686_gnu 0.42.0",
+ "windows_i686_msvc 0.42.0",
+ "windows_x86_64_gnu 0.42.0",
  "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_x86_64_msvc 0.42.0",
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 [[package]]
@@ -407,24 +2518,72 @@
 
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@@ -437,6 +2596,33 @@
 
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diff --git a/qg-cli/Cargo.toml b/qg-cli/Cargo.toml
index 914e945..46f8f2d 100644
--- a/qg-cli/Cargo.toml
+++ b/qg-cli/Cargo.toml
@@ -11,3 +11,7 @@
 clap = { version = "4.0.25", features = ["derive"] }
 qg = { path = "../qg" }
 tokio = { version = "1.21.2", features = ["full"] }
+
+[features]
+default = []
+python = ["qg/python"]
diff --git a/qg-cli/src/main.rs b/qg-cli/src/main.rs
index defc727..060cbcf 100644
--- a/qg-cli/src/main.rs
+++ b/qg-cli/src/main.rs
@@ -15,6 +15,9 @@
 mod hello;
 mod subcommands;
 
+#[cfg(feature = "python")]
+mod py_demo;
+
 use clap::{FromArgMatches, Subcommand};
 
 use subcommands::Subcommands;
diff --git a/qg-cli/src/py_demo.rs b/qg-cli/src/py_demo.rs
new file mode 100644
index 0000000..df4bbbf
--- /dev/null
+++ b/qg-cli/src/py_demo.rs
@@ -0,0 +1,27 @@
+// Copyright 2022 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+use qg::py_demo;
+
+/// Executes Python code in the qg scope.
+#[derive(clap::Parser, Debug)]
+#[command(about)]
+pub struct Command {
+    /// Python code to execute.
+    code: String,
+}
+
+pub fn run(args: &Command) {
+    py_demo(&args.code);
+}
diff --git a/qg-cli/src/subcommands.rs b/qg-cli/src/subcommands.rs
index d4dced5..b33cd98 100644
--- a/qg-cli/src/subcommands.rs
+++ b/qg-cli/src/subcommands.rs
@@ -14,6 +14,9 @@
 
 use crate::hello;
 
+#[cfg(feature = "python")]
+use crate::py_demo;
+
 /// Builtin subcommands for the program.
 ///
 /// Each variant in the enum is the name of a subcommand and should contain a
@@ -21,6 +24,8 @@
 #[derive(clap::Parser, Debug)]
 pub enum Subcommands {
     Hello(hello::Command),
+    #[cfg(feature = "python")]
+    PyDemo(py_demo::Command),
 }
 
 impl Subcommands {
@@ -30,6 +35,10 @@
             Self::Hello(cmd) => {
                 hello::run(cmd);
             }
+            #[cfg(feature = "python")]
+            Self::PyDemo(cmd) => {
+                py_demo::run(cmd);
+            }
         }
     }
 }
diff --git a/qg/Cargo.toml b/qg/Cargo.toml
index 89fd219..91ed2a8 100644
--- a/qg/Cargo.toml
+++ b/qg/Cargo.toml
@@ -8,3 +8,8 @@
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+rustpython = {git="https://github.com/RustPython/RustPython", features=["freeze-stdlib"], optional = true }
+
+[features]
+default = []
+python = ["dep:rustpython"]
diff --git a/qg/src/lib.rs b/qg/src/lib.rs
index d9797db..5886c28 100644
--- a/qg/src/lib.rs
+++ b/qg/src/lib.rs
@@ -12,11 +12,42 @@
 // License for the specific language governing permissions and limitations under
 // the License.
 
+#[cfg(feature = "python")]
+mod py;
+
 #[must_use]
 pub fn name() -> &'static str {
     "qg"
 }
 
+#[cfg(feature = "python")]
+pub fn py_demo(code: &str) {
+    use py::Py;
+
+    let mut py = Py::new();
+    let py_result = py.run(
+        // Scope initialization function.
+        |vm, scope| {
+            // Add a `rust_print` function to the scope before running the code.
+            scope.globals.set_item(
+                "rust_print",
+                vm.ctx
+                    .new_function("rust_print", |s: String| println!("[R] {}", s))
+                    .into(),
+                vm,
+            )?;
+
+            Ok(())
+        },
+        code,
+    );
+
+    if let Err(e) = py_result {
+        // Placeholder until qg has an error type
+        println!("py_demo error: {:?}", e);
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/qg/src/py/mod.rs b/qg/src/py/mod.rs
new file mode 100644
index 0000000..bb6671c
--- /dev/null
+++ b/qg/src/py/mod.rs
@@ -0,0 +1,135 @@
+// Copyright 2022 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+use std::sync::atomic::Ordering;
+
+use rustpython::{
+    self,
+    vm::{
+        self, identifier,
+        stdlib::{atexit, sys},
+        PyObjectRef,
+    },
+    InterpreterConfig,
+};
+
+/// An ergonomic wrapper for a Python interpreter.
+///
+/// This type is intentionally not exported outside of the crate for
+/// now.  Ideally all details of python code invocation will be private
+/// to the crate.
+pub(crate) struct Py {
+    interpreter: vm::Interpreter,
+}
+
+impl Py {
+    /// Create a new Python interpreter.
+    pub fn new() -> Py {
+        let mut config = InterpreterConfig::new();
+        config = config.init_stdlib();
+        Py {
+            interpreter: config.interpreter(),
+        }
+    }
+
+    /// Run Python code inside the interpreter.
+    ///
+    /// `init_scope` is run before the code is executed giving the caller the
+    /// ability to set up the scope before code execution.
+    pub fn run(
+        &mut self,
+        init_scope: impl FnOnce(&vm::VirtualMachine, &mut vm::scope::Scope) -> vm::PyResult<()>,
+        code: &str,
+    ) -> vm::PyResult<PyObjectRef> {
+        self.interpreter.enter(|vm| -> vm::PyResult<PyObjectRef> {
+            let mut scope = vm.new_scope_with_builtins();
+            vm.import("site", None, 0)?;
+
+            init_scope(vm, &mut scope)?;
+
+            let result = vm
+                .compile(code, vm::compiler::Mode::Single, "<qg>".to_owned())
+                .map_err(|err| vm.new_syntax_error(&err))
+                .and_then(|code_obj| vm.run_code_obj(code_obj, scope.clone()));
+            Self::flush_std(vm);
+            result
+        })
+    }
+
+    fn flush_std(vm: &vm::VirtualMachine) {
+        if let Ok(stdout) = sys::get_stdout(vm) {
+            let _res = vm.call_method(&stdout, identifier!(vm, flush).as_str(), ());
+        }
+        if let Ok(stderr) = sys::get_stderr(vm) {
+            let _res = vm.call_method(&stderr, identifier!(vm, flush).as_str(), ());
+        }
+    }
+}
+
+impl Drop for Py {
+    fn drop(&mut self) {
+        self.interpreter.enter(|vm| {
+            atexit::_run_exitfuncs(vm);
+            vm.state.finalizing.store(true, Ordering::Release);
+
+            Self::flush_std(vm);
+        });
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use std::sync::{Arc, Mutex};
+
+    #[test]
+    fn function_callback() {
+        // The Python VM is treated as another thread context so types must
+        // implement Send and Sync.
+        let lines = Arc::new(Mutex::new(Vec::new()));
+
+        // A clone for the python side
+        let py_lines = lines.clone();
+
+        let mut py = Py::new();
+        let code = r#"
+qg_test_func("line1")
+qg_test_func("line2")
+        "#;
+        py.run(
+            // Scope initialization function.
+            |vm, scope| {
+                // Add a `rust_print` function to the scope before running the code.
+                scope.globals.set_item(
+                    "qg_test_func",
+                    vm.ctx
+                        .new_function("qg_test_func", move |s: String| {
+                            println!("qg_test_func: {}", s);
+                            py_lines.lock().unwrap().push(s);
+                        })
+                        .into(),
+                    vm,
+                )?;
+
+                Ok(())
+            },
+            code,
+        );
+
+        assert_eq!(
+            *lines.lock().unwrap(),
+            vec!["line1".to_string(), "line2".to_string()]
+        );
+    }
+}
diff --git a/tools/presubmit.sh b/tools/presubmit.sh
index 810e256..24a801f 100755
--- a/tools/presubmit.sh
+++ b/tools/presubmit.sh
@@ -8,10 +8,13 @@
     echo "==="
 }
 
-check cargo build
-check cargo test
+FEATURES=python
+
+# Build and test in release mode to make tests execute faster.
+check cargo build --release --features ${FEATURES}
+check cargo test --release --features ${FEATURES}
 check cargo fmt --check
-check cargo clippy -- -D clippy::pedantic
+check cargo clippy --features ${FEATURES} -- -D clippy::pedantic
 
 echo
-echo "All presubmit steps passed!"
\ No newline at end of file
+echo "All presubmit steps passed!"