Modular•9mo ago

Python.import_module not working as expected

Hi there ❤️‍🔥 ! Trying to go through a basic hello world example and would like to import stdlib modules from python. My silly app looks like this:

#!/usr/bin/env mojo

from python import Python

fn name() -> String:
    try:
        let input = Python.import_module('input')
        return str(input("What is your name? "))
    except:
        print("Error: Python not found")
        return "Mojo"

fn main() -> None:
    # let is an immutable variable
    let hello = "Hello World!"
    print(hello)

    # var is a mutable variable
    var name = name()
    print("Hello", name)

    # mutate the variable
    name = "Mojo"
    print("Hello", name)

#!/usr/bin/env mojo

from python import Python

fn name() -> String:
    try:
        let input = Python.import_module('input')
        return str(input("What is your name? "))
    except:
        print("Error: Python not found")
        return "Mojo"

fn main() -> None:
    # let is an immutable variable
    let hello = "Hello World!"
    print(hello)

    # var is a mutable variable
    var name = name()
    print("Hello", name)

    # mutate the variable
    name = "Mojo"
    print("Hello", name)

Getting

λ mojo ../hello.🔥
Hello World!
Error: Python not found
Hello Mojo
Hello Mojo

λ mojo ../hello.🔥
Hello World!
Error: Python not found
Hello Mojo
Hello Mojo

What am I missing here? Thanks in advance!

3 Replies

exographicskip•9mo ago

Debug console shows

Running initCommands:
(lldb) settings set target.show-hex-variable-values-with-leading-zeroes false
(lldb) settings set target.process.optimization-warnings false
(lldb) plugin load '/Users/lance/.modular/pkg/packages.modular.com_mojo/lib/libMojoLLDB.dylib'
(lldb) command script import /Users/lance/.modular/pkg/packages.modular.com_mojo/lib/lldb-visualizers/lldbDataFormatters.py
error: module importing failed: This script interpreter does not support importing modules.
(lldb) command script import /Users/lance/.modular/pkg/packages.modular.com_mojo/lib/lldb-visualizers/mlirDataFormatters.py
error: module importing failed: This script interpreter does not support importing modules.
Hello World!
Error: Python not found
Hello Mojo
Hello Mojo

Running initCommands:
(lldb) settings set target.show-hex-variable-values-with-leading-zeroes false
(lldb) settings set target.process.optimization-warnings false
(lldb) plugin load '/Users/lance/.modular/pkg/packages.modular.com_mojo/lib/libMojoLLDB.dylib'
(lldb) command script import /Users/lance/.modular/pkg/packages.modular.com_mojo/lib/lldb-visualizers/lldbDataFormatters.py
error: module importing failed: This script interpreter does not support importing modules.
(lldb) command script import /Users/lance/.modular/pkg/packages.modular.com_mojo/lib/lldb-visualizers/mlirDataFormatters.py
error: module importing failed: This script interpreter does not support importing modules.
Hello World!
Error: Python not found
Hello Mojo
Hello Mojo

Compiled version

λ ./hello
Hello World!
Mojo/Python interoperability error: Unable to locate a suitable libpython, please set `MOJO_PYTHON_LIBRARY`
Segmentation fault: 11

λ ./hello
Hello World!
Mojo/Python interoperability error: Unable to locate a suitable libpython, please set `MOJO_PYTHON_LIBRARY`
Segmentation fault: 11

Which is interesting bc I set

export MOJO_PYTHON_LIBRARY=/Users/lance/.asdf/installs/python/3.11.6/lib/libpython3.11.dylib

export MOJO_PYTHON_LIBRARY=/Users/lance/.asdf/installs/python/3.11.6/lib/libpython3.11.dylib

zverianskii•9mo ago

input is not a module, try this one:

let builtins = Python.import_module('builtins')
return str(builtins.input("What is your name? "))

let builtins = Python.import_module('builtins')
return str(builtins.input("What is your name? "))

exographicskip•9mo ago

That did it! Thank you! This is what I landed on fwiw

#!/usr/bin/env mojo

fn main():
    from python import Python

    # let is an immutable variable
    let hello = "Hello World!"
    print(hello)

    # var is a mutable variable
    try:
        let builtins = Python.import_module("builtins")
        var name = str(builtins.input("What is your name? "))
        print("Hello", name)
        name = "World"  # mutate the variable
        print("Hello", name)
    except:
        print("Unable to import Python module 'builtins'")

#!/usr/bin/env mojo

fn main():
    from python import Python

    # let is an immutable variable
    let hello = "Hello World!"
    print(hello)

    # var is a mutable variable
    try:
        let builtins = Python.import_module("builtins")
        var name = str(builtins.input("What is your name? "))
        print("Hello", name)
        name = "World"  # mutate the variable
        print("Hello", name)
    except:
        print("Unable to import Python module 'builtins'")

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Python.import_module not working as expected