How to run a python project by using rustpython_vm? #5721

qzd1989 · 2025-04-20T11:29:21Z

qzd1989
Apr 20, 2025

my rust project structure:

- examples/
  - rustpython.rs
- python_project/
  - main.py
  - utils/
    - helper.py
- src/
  - main.rs
Cargo.toml

Cargo.toml

[dependencies]
rustpython-stdlib = "0.4.0"
rustpython-vm = "0.4.0"

python_project/main.py

import time
print("Hello, World!",time.time())
from utils.helper import greet    #this line causes error.
print(greet("World"))

python_project/utils/helper.py

def greet(name):
    return f"Hello, {name}!"

examples/rustpython.rs

use rustpython_vm as vm;
fn main() -> vm::PyResult<()> {
    let vm = vm::Interpreter::with_init(Default::default(), |vm| {
        vm.add_native_modules(rustpython_stdlib::get_module_inits());
    });
    vm.enter(|vm| {
        vm.insert_sys_path(vm.new_pyobj("python_project"))?;
        let scope = vm.new_scope_with_builtins();
        let source_path = "python_project/main.py";
        let source = std::fs::read_to_string(source_path).expect("unable to read main.py");
        let code_obj = vm
            .compile(&source, vm::compiler::Mode::Exec, source_path.into())
            .map_err(|err| vm.new_syntax_error(&err, Some(&source)))?;
        if let Err(err) = vm.run_code_obj(code_obj, scope) {
            vm.print_exception(err);
        }
        Ok(())
    })
}

cargo run --example rustpython

Hello, World! 1745159203.3709767
Traceback (most recent call last):
  File "python_project/main.py", line 3, in <module>
    from utils.helper import greet
ModuleNotFoundError: No module named 'utils'

thank you sir, really need help, it seems insert_sys_path doesn't work or I didn't find the right way?

youknowone · 2025-04-20T14:02:48Z

youknowone
Apr 20, 2025
Maintainer

Would you share the result of vm.print_exception(err)?

3 replies

qzd1989 Apr 20, 2025
Author

I update the rust code and output.
the error is "ModuleNotFoundError: No module named 'utils'"

youknowone Apr 20, 2025
Maintainer

maybe missing __init__.py under utils? If it doesn't help, could you share the crate you made?

qzd1989 Apr 21, 2025
Author

maybe missing __init__.py under utils? If it doesn't help, could you share the crate you made?

yes, I tried, but not work. here is my code:

https://github.com/qzd1989/rust-rustpython-test

thank you, sir.

arihant2math · 2025-04-22T02:52:25Z

arihant2math
Apr 22, 2025
Collaborator

Ensure the project works with regular python before attempting to use rustpython

1 reply

qzd1989 Apr 22, 2025
Author

I run the same code in a installed python env, it works, and it doesn't work in an embed python env(same error, can't find module).
it semms that rustpython doesn't load the path of the project into sys.path.

and this line:

vm.insert_sys_path(vm.new_pyobj("python_project"))?;

I think it should work but it doesn't work...

qzd1989 · 2025-04-22T05:43:39Z

qzd1989
Apr 22, 2025
Author

I have used embeded cpython instead of rustpython.

0 replies

youknowone · 2025-04-24T07:16:00Z

youknowone
Apr 24, 2025
Maintainer

Okay, found problem.

rustpython-vm = "0.4.0"
have to be
rustpython-vm = { version = "0.4.0", features = ["importlib] }

I regard this as a user experience bug not to warn common pitfall easy.

1 reply

qzd1989 Apr 24, 2025
Author

thank you sir, I think the code comments and examples in RustPython are too few, making it unfriendly for beginners :(

i have used embeded cpython, hope rustpython will become better.

Uh oh!

How to run a python project by using rustpython_vm? #5721

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qzd1989 Apr 20, 2025

Replies: 4 comments · 5 replies

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youknowone Apr 20, 2025 Maintainer

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qzd1989 Apr 20, 2025 Author

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youknowone Apr 20, 2025 Maintainer

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qzd1989 Apr 21, 2025 Author

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arihant2math Apr 22, 2025 Collaborator

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qzd1989 Apr 22, 2025 Author

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qzd1989 Apr 22, 2025 Author

Uh oh!

youknowone Apr 24, 2025 Maintainer

Uh oh!

qzd1989 Apr 24, 2025 Author

qzd1989
Apr 20, 2025

Replies: 4 comments 5 replies

youknowone
Apr 20, 2025
Maintainer

qzd1989 Apr 20, 2025
Author

youknowone Apr 20, 2025
Maintainer

qzd1989 Apr 21, 2025
Author

arihant2math
Apr 22, 2025
Collaborator

qzd1989 Apr 22, 2025
Author

qzd1989
Apr 22, 2025
Author

youknowone
Apr 24, 2025
Maintainer

qzd1989 Apr 24, 2025
Author