Now we can import the module from the package and use that.

examples/package/use_project/proj2_2.py
from __future__ import print_function
import sys, os
sys.path.insert(0, os.path.join(
    os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
    '2' ) )

import mymath
print(mymath.calc.add(4, 7))  # 11

from mymath import calc
print(calc.add(5, 9))         # 14