[Python] Python + WSGI - Can't import my own modules from a directory?

I'm new to Python and i have looked around on how to import my custom modules from a directory/ sub directories. Such as this and this.

This is my structure,

index.py
__init__.py
modules/
hello.py
HelloWorld.py
moduletest.py


index.py,

# IMPORTS MODULES
import hello
import HelloWorld
import moduletest

# This is our application object. It could have any name,
# except when using mod_wsgi where it must be "application"
def application(environ, start_response):

# build the response body possibly using the environ dictionary
response_body = 'The request method was %s' % environ['REQUEST_METHOD']

# HTTP response code and message
status = '200 OK'

# These are HTTP headers expected by the client.
# They must be wrapped as a list of tupled pairs:
# [(Header name, Header value)].
response_headers = [('Content-Type', 'text/plain'),
('Content-Length', str(len(response_body)))]

# Send them to the server using the supplied function
start_response(status, response_headers)

# Return the response body.
# Notice it is wrapped in a list although it could be any iterable.
return [response_body]


init.py,

from modules import moduletest
from modules import hello
from modules import HelloWorld


modules/hello.py,

def hello():
return 'Hello World from hello.py!'


modules/HelloWorld.py,

# define a class
class HelloWorld:
def __init__(self):
self.message = 'Hello World from HelloWorld.py!'

def sayHello(self):
return self.message


modules/moduletest.py,

# Define some variables:
numberone = 1
ageofqueen = 78

# define some functions
def printhello():
print "hello"

def timesfour(input):
print input * 4

# define a class
class Piano:
def __init__(self):
self.type = raw_input("What type of piano? ")
self.height = raw_input("What height (in feet)? ")
self.price = raw_input("How much did it cost? ")
self.age = raw_input("How old is it (in years)? ")

def printdetails(self):
print "This piano is a/an " + self.height + " foot",
print self.type, "piano, " + self.age, "years old and costing\
" + self.price + " dollars."


But through the Apache WSGI, I get this error,

[wsgi:error] [pid 5840:tid 828] [client 127.0.0.1:54621] import hello [wsgi:error] [pid 5840:tid 828] [client 127.0.0.1:54621] ImportError: No module named hello
​

Any idea what have I done wrong?

EDIT:

index.py
__init__.py
modules/
hello.py
HelloWorld.py
moduletest.py
User/
Users.py

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