Given the full path, how to load Python module? Note that the file can be anywhere in the file system because it is a configuration option.
The advantage of adding a path to sys.path (by using imp) is that it simplifies operations when importing multiple modules from a single package. For example:
import sys # the mock-0.3.1 dir contains testcase.py, testutils.py & mock.py sys.path.append('/foo/bar/mock-0.3.1') from testcase import TestCase from testutils import RunTests from mock import Mock, sentinel, patch
You can use the pkgutil module (in particular walk_packages Method) to get the list of packages in the current directory. From there, using importlib to mechanically import the required modules is simple:
import pkgutil import importlib packages = pkgutil.walk_packages(path='.') for importer, name, is_package in packages: mod = importlib.import_module(name) # do whatever you want with module now, it's been imported!
In Linux, you can add symbolic links to the directory where python scripts are located.
ln -s /absolute/path/to/module/module.py /absolute/path/to/script/module.py
If you change the contents of / absolute/path/to/module/module.py, python creates / absolute/path/to/script/module.pyc and updates it.
Then include the following in mypython script.py
from module import *
I think the best way is to get it from official documents( 29.1. Import - access imp ort internals ):
import imp import sys def __import__(name, globals=None, locals=None, fromlist=None): # Fast path: see if the module has already been imported. try: return sys.modules[name] except KeyError: pass # If any of the following calls raises an exception, # there's a problem we can't handle -- let the caller handle it. fp, pathname, description = imp.find_module(name) try: return imp.load_module(name, fp, pathname, description) finally: # Since we may exit via an exception, close fp explicitly. if fp: fp.close()
This area of Python 3.4 seems hard to understand! However, some hacking was done using Chris Calloway's code, and I managed to make some work properly. This is the basic function.
def import_module_from_file(full_path_to_module): """ Import a module given the full path/filename of the .py file Python 3.4 """ module = None try: # Get module name and path from full path module_dir, module_file = os.path.split(full_path_to_module) module_name, module_ext = os.path.splitext(module_file) # Get module "spec" from filename spec = importlib.util.spec_from_file_location(module_name,full_path_to_module) module = spec.loader.load_module() except Exception as ec: # Simple error printing # Insert "sophisticated" stuff here print(ec) finally: return module
This seems to use modules that are not recommended in Python 3.4. I don't pretend to understand why, but it seems to work in the program. I found that Chris's solution worked on the command line, but not inside the program.