Sepreating python code in raspberry pi pico

Question

I am unable to import class from a different file in micro python on raspberry pi pico.

Eg. directory structure

dir/
|__main.py
|__imports/
|_example.py

filename : main.py


from imports.example import ex

a = ex("name")
a.print_name()

filename : example.py


class ex:
    def __init__(self, name):
        self.name = name

    def print_name(self):
        print(self.name)

The error states as following

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
ImportError: no module named 'imports.example'

The code works when all the classes are present inside the same file. I am using pico-go vscode extension on debain. I tried adding __ init __.py in the example directory, but no luck.

@Marcello Romani Above mentioned code is just an example , just for people to get an idea of the problem and it’s not the actual code. I fixed the typo , thank you for pointing it out. — vishnu joshi, Feb 17 '21 at 17:08
I am not certain, but I think only the directories in `sys.path` are searched. Maybe try adding `"imports"` to the `sys.path`? I'm very new at Python + Micropython, so maybe this is incorrect. The MP doc has a section on incompatibilities with standard Python... — aMike, Feb 17 '21 at 18:48
@vishnujoshi :-) I didn't mean to be picky (my message didn't convey my intent), what I really meant is that perhaps you overlooked that typo and that's why you got the import error. — Marcello Romani, Feb 17 '21 at 20:02

score 3 · Accepted Answer · answered Mar 23 '22 at 10:42

3

The Run button stands for Run current file. Therefore, only main.py is uploaded. The import will fail because example.py is not uploaded.

Select Pico-Go > Upload Project from All commands for upload example.py to pico. Then click Run and execute main.py, the import will be successful.

Environment

vscode (1.65.2)
Pico-Go (v1.4.3)

answered Mar 23 '22 at 10:42

Amamiya

81
4

but it also then uploads .venv and other folders. How do I prevent that? – InfiniteLoop Jul 02 '23 at 17:51

score 1 · Answer 2 · answered Feb 17 '21 at 20:11

1

You are missing an empty __init__.py file in the imports directory, which would "magically" (by convention, actually) turn imports into a package.

https://docs.python.org/3.8/tutorial/modules.html#packages

dir/
   main.py
   imports/
        __init__.py     # <= turns 'imports' into a package
        example.py

$ python main.py
name

answered Feb 17 '21 at 20:11

Marcello Romani

2,967
31
40

1

But it was of no help. I already tried it and Im using micro python. – vishnu joshi Feb 18 '21 at 03:35
1

Have you tried this exact example? This is 100% standard Python. You should probably post your code then. – Marcello Romani Feb 18 '21 at 03:37
2

Yes, I have tried it. I have used micro python for raspberry pi pico where the code is uploaded using pico-go vscode extension. I am not executing the code through cli . – vishnu joshi Feb 18 '21 at 05:26
Cool. Unfortunately I don't own a Pico so unless you post the full code and command output I'm at a loss about what could be wrong. Good luck! :-) – Marcello Romani Feb 19 '21 at 09:37
The example code itself throws that error. – vishnu joshi Feb 20 '21 at 04:47

Sepreating python code in raspberry pi pico

2 Answers2