Description

The standard C-Python allows modification of built-in modules. With that capability, we can create genuine global variables across all imported modules in the following way:

import os
os.g_abc = "Hello world"

Using this technique, inside any imported module, you can access os.g_abc after importing os module.

However, this is not allowed in Micropython, giving the following error:

AttributeError: 'module' object has no attribute 'g_abc'

FYI, this is the only way to create genuine global variables if your level of python profession believes that globals() can solve the problem. No. That is because globals() is only global w.r.t. the module that it is located in, not w.r.t. the global runtime. For example,

### moduleA.py

def test():
 globals()['g_abc'] = 'hello'

def mainA():
 print(g_abc)

### moduleB.py

import moduleA
moduleA.test()

moduleA.mainA()   # this works fine
print(globals()['g_abc']). # this will crash, because the global variable is only defined within moduleA context, not in moduleB or elsewhere

Code Size

No response

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree