Found here: https://stackoverflow.com/questions/14191900/pythonimport-module-from-memory

module-from-string.py

"""Use custom meta hook to import modules available as strings. 
Cp. PEP 302 http://www.python.org/dev/peps/pep-0302/#specification-part-2-registering-hooks"""
import sys
import imp

modules = {"a" : 
"""def hello():
    return 'Hello World A!'""",
"b":
"""def hello():
    return 'Hello World B!'"""}    

class StringImporter(object):

   def __init__(self, modules):
       self._modules = dict(modules)


   def find_module(self, fullname, path):
      if fullname in self._modules.keys():
         return self
      return None

   def load_module(self, fullname):
      if not fullname in self._modules.keys():
         raise ImportError(fullname)

      new_module = imp.new_module(fullname)
      exec self._modules[fullname] in new_module.__dict__
      return new_module


if __name__ == '__main__':
   sys.meta_path.append(StringImporter(modules))

   # Let's use our import hook
   from a import hello
   print hello()
   from b import hello
   print hello()