How to take user input form the terminal?

Self-explanatory, the best I could find with research was:

from python import Python

fn main() raises:
    var a = Python.evaluate("input('What is your name? ')").to_string()
    print(a)

from python import Python

fn main() raises:
    var a = Python.evaluate("input('What is your name? ')").to_string()
    print(a)

I got this error: What is your name? pedro Unhandled exception caught during execution: 'str' object has no attribute 'to_string' mojo: error: execution exited with a non-zero result: 1 So my questions: 1. How can I do it? Thank you.

20 Replies

bunny•4mo ago

@MyriadColors , the error it telling you that you're trying to do to_string on a str object. So, it's already a string. If you just remove .to_string() then it works. See attached pics. Also, check out @toasty 's repo: https://github.com/thatstoasty/prism It's more for making a CLI tool (a'la Go's famous "Cobra" library) and not so much for holding a terminal-conversation, but I'm sure you could achieve that, too.

GitHub

GitHub - thatstoasty/prism: Mojo CLI Library modeled after Cobra.

Mojo CLI Library modeled after Cobra. Contribute to thatstoasty/prism development by creating an account on GitHub.

bunny•4mo ago

erk..... didn't mean to ping you, toasty. I meant to make that a silent "no ping" at-tag before posting. Sorry. 😐

MyriadColors•4mo ago

Thank you!

ModularBot•4mo ago

Congrats @MyriadColors, you just advanced to level 1!

MyriadColors•4mo ago

I just copied and pasted the code as I assumed it was needed. Though I really do find it weird that mojo doesnt have this feature as part of the language

bunny•4mo ago

You good. The beautiful thing about stumbling around with Mojo: we're all stumbling around with Mojo. It's new; we're all noobs. 😂

MyriadColors•4mo ago

Im not compl,aining btw, its just something I figured every language would have

bunny•4mo ago

oh, give it time. The Mojo team has a stated goal of being a superset of Python. That means implementing stuff like input(), too. But it's brand-spanking-new. Just give 'em time. 🙂

MyriadColors•4mo ago

Cool, hopefully we get something like std::cout instead of printf to make it easier 😛 also, sad to see f-strings doesnt work

bunny•4mo ago

also, you could always contrib to the std-lib! If they just add some screaming guitar solos in the background, then this new vid would be a good motivational vid. 😄 https://www.youtube.com/watch?v=TJpFSSIts5Q

Modular

YouTube

Contributing to Open-Source Mojo🔥 Standard Library

Mojo🔥 standard library is now open-source. In this video Modular engineer Joe Loser discusses how you can get started with contributing to Mojo🔥 using Mojo🔥 nightly builds. Chapters: 00:00 Contributing to Mojo🔥 Standard Library 01:59 Demo: Contributing a simple test case Resources: Blog post: https://www.modular.com/blog/how-to-contribute-to-...

bunny•4mo ago

Given that they're aiming for pythonic syntax, I'd expect it to remain print(). And I agree 100% re f-strings. Anytime I'm in any language that doesn't have them, I find that I really miss my f-strings.

MyriadColors•4mo ago

Trying to mark your answer as the solution.

toasty•4mo ago

@MyriadColors Try this/

from python import Python

fn main() raises:
    var a = str(Python.evaluate("input('What is your name? ')"))
    print(a)

from python import Python

fn main() raises:
    var a = str(Python.evaluate("input('What is your name? ')"))
    print(a)

It is possible to do it all in Mojo, but it's not simple as it would involve setting your terminal to raw mode via an external_call to C and capturing N bytes from stdin. If you're interested I could link you to an example from my termios repo

MyriadColors•4mo ago

Would it work on linux? I know a bit of C

toasty•4mo ago

It should work on linux, but you might need to mess with the structs a bit since I wrote this on a mac. It seems like the termios struct differs on linux and mac. Some of the constants might differ as well, so it's hard to guarantee. https://github.com/thatstoasty/termios/blob/main/examples/get_key.mojo I reimplemented the python's termios and tty functions by calling the underlying C functions via external_call in Mojo. https://github.com/thatstoasty/termios/blob/main/termios/c/terminal.mojo

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How to take user input form the terminal?