Experiencing an error when trying to import from a diffrent directory

Question

i am trying to import a function from another file

a/b/c.py
a/1/2.py

i wanted to import a funciton from c.py in 2.py

sys.path.insert(1, '/path/to/c/py/a/b/c')
from c import function1, function2

i got this error:

Traceback (most recent call last):
  File "path\to\2\py\a\1\2.py", line 5, in <module>
    from c import function1, function2

ModuleNotFoundError: No module named 'c'