def createInstance(module_name, class_name, *args, **kwargs):
  module_meta = __import__(module_name, globals(), locals(), [class_name])
  class_meta = getattr(module_meta, class_name)
  obj = class_meta(*args, **kwargs)
  return obj

from my_modules.my_another_module import *
class MyObject(object):
  def test(self):
    print 'MyObject.test'
    MyObject1().test()
    MyObject2().test()
    MyAnotherObject().test()
class MyObject1(object):
  def test(self):
    print 'MyObject1.test'
class MyObject2(object):
  def test(self):
    print 'MyObject2.test'

class MyAnotherObject(object):
  def test(self):
    print 'MyAnotherObject.test'

def createInstance(module_name, class_name, *args, **kwargs):
  module_meta = __import__(module_name, globals(), locals(), [class_name])
  class_meta = getattr(module_meta, class_name)
  obj = class_meta(*args, **kwargs)
  return obj
obj = createInstance("my_modules.my_module", "MyObject")
obj.test()
MyObject.test
MyObject1.test
MyObject2.test
MyAnotherObject.test

Traceback (most recent call last):
 File "test.py", line 12, in <module>
  obj = createInstance("my_modules.my_module", "MyObject")
 File "test.py", line 7, in createInstance
  module_meta = __import__(module_name, globals(), locals(), [class_name])
ImportError: No module named my_modules.my_module
Failed to execute script test

import my_modules.my_module
def createInstance(module_name, class_name, *args, **kwargs):
  module_meta = __import__(module_name, globals(), locals(), [class_name])
  class_meta = getattr(module_meta, class_name)
  obj = class_meta(*args, **kwargs)
  return obj
obj = createInstance("my_modules.my_module", "MyObject")
obj.test()

pyinstaller -D --hidden-import my_modules.my_module test.py

import sys
sys.path.append(...)
def createInstance(module_name, class_name, *args, **kwargs):
  module_meta = __import__(module_name, globals(), locals(), [class_name])
  class_meta = getattr(module_meta, class_name)
  obj = class_meta(*args, **kwargs)
  return obj
obj = createInstance("my_modules.my_module", "MyObject")
obj.test()