No explicit way to create a TypeAliasType instance with a __module__ of choice

The __module__ attribute is readonly, and will always be derived using caller():

Lines 2199 to 2202 in 16185e9

    
           PyObject *module = caller(); 
        
           if (module == NULL) { 
        
               return NULL; 
        
           }

So the only ways to create a type alias with a __module__ of choice is by managing globals()["__name__"] using e.g. eval(..., globals=...), temporarily setting globals()["name"] = ..., or defining a custom module with that __name__.

It would make more sense to just make __module__ mutable.

Isn't it a duplicate of an exisint issue already?

It is a dup of #149171 was changed in 3.15+.

Oops sorry!

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No explicit way to create a `TypeAliasType` instance with a `module` of choice #151607

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	PyObject *module = caller();
	if (module == NULL) {
	return NULL;
	}

No explicit way to create a TypeAliasType instance with a __module__ of choice #151607

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picnixz commented on Jun 17, 2026

picnixz commented on Jun 17, 2026

flying-sheep commented on Jun 18, 2026

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No explicit way to create a `TypeAliasType` instance with a `module` of choice #151607