Python __import__ from the same folder does not work

Question

I have a directory structure like this:

|- project
  |- commands.py
  |- Modules
  | |- __init__.py
  | |- base.py
  | \- build.py
  \- etc....

I have the following code in __init__.py

commands = []
hooks = []

def load_modules():
    """ dynamically loads commands from the /modules subdirectory """
    path = "\\".join(os.path.abspath(__file__).split("\\")[:-1])
    modules = [f for f in os.listdir(path) if f.endswith(".py") and f != "__init__.py"]
    print modules
    for file in modules:
        try:
            module = __import__(file.split(".")[0])
            print module
            for obj_name in dir(module):
                try:
                    potential_class = getattr(module, obj_name)
                    if isinstance(potential_class, Command):
                        #init command instance and place in list
                        commands.append(potential_class(serverprops))
                    if isinstance(potential_class, Hook):
                        hooks.append(potential_class(serverprops))
                except:
                    pass
        except ImportError as e:
            print "!! Could not load %s: %s" % (file, e)
    print commands
    print hooks

I am trying to get the __init__.pycorresponding commands and hooks to the specified lists to load, however I always click ImportError on module = __import__(file.split(".")[0]), albeit __init__.pybase.py, etc. all are in the same folder, I confirmed that nothing in any of the module files requires anything in __init__.py, so I really lose what to do.

Answer 1

All you are missing is the availability of modules on the system path. Add

import sys
sys.path.append(path)

after the line path = ...and you should be set. Here is my test script:

import os, os.path, sys

print '\n'.join(sys.path) + '\n' * 3

commands = []
hooks = []

def load_modules():
    """ dynamically loads commands from the /modules subdirectory """
    path = os.path.dirname(os.path.abspath(__file__))

    print "In path:", path in sys.path
    sys.path.append(path)

    modules = [f for f in os.listdir(path) if f.endswith(".py") and f != "__init__.py"]
    print modules
    for file in modules:
        try:
            modname = file.split(".")[0]
            module = __import__(modname)
            for obj_name in dir(module):
                print '%s.%s' % (modname, obj_name )
        except ImportError as e:
            print "!! Could not load %s: %s" % (file, e)
    print commands


load_modules()