file1.py:
def test_globals():
globals()['t']=5
in python3 repl:
>>> from file1 import *
>>> test_globals()
>>> t
Traceback ....
NameError: name 't' is not defined
>>> def test_globals2(): #local context
globals()['t'] = 5
>>> test_globals2()
>>> t
5
How to fix test_globals function to actually modify globals()?
The problem with what you did is that from file1 import * didn't import t because it didn't exist. If you repeat the import line, it will work:
>>> from file1 import *
>>> test_globals()
>>> t
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 't' is not defined
>>> from file1 import *
>>> t
5
Another thing that would work:
>>> import file1 as f1
>>> f1.t
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 't'
>>> f1.test_globals()
>>> f1.t
5
However, if you're only after reloading a module (as you wrote in the comments), consider using importlib.reload.
