在树莓派 pico 中分离 python 代码

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.

Answer 1

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)

Answer 2

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