Home > Python Cannot > Python Cannot Import Module

Python Cannot Import Module


The Python Software Foundation is a non-profit corporation. The current working directory - denoted by an empty string - is handled slightly differently from other entries on sys.path. Second, the value for the current working directory is looked up fresh for each module lookup. Loaders¶ Module loaders provide the critical function of loading: module execution. check over here

How often should I replace windscreen wiper blades? You can also import several modules in one line by doing import foo, bar, but it is considered good practice to put each import in a single line.2. This is the same example before, except imports our module using imp instead of by manipulating sys.path: import sys, os, imp # Create a hi module in your home directory. That doesn't seem to work for the BDNYC module that comes with the python database, hence this approach.

Python Can't Find Module In Site-packages

So if foo.bar.baz was previously imported, sys.modules will contain entries for foo, foo.bar, and foo.bar.baz. import sys import shelve import os filename = '/tmp/pymotw_import_example.shelve' if os.path.exists(filename): os.unlink(filename) db = shelve.open(filename) try: db['data:README'] = """ ============== package README ============== This is the README for ``package``. """ db['package.__init__'] However, if find_spec() is implemented on the path entry finder, the legacy methods are ignored. find_loader() takes one argument, the fully qualified name of the module being imported.

The import system 5.1. importlib 5.2. Or put another way, packages are just a special kind of module. This happens even if there are other preceding subdirectories on sys.path that match the desired package name, but do not include an __init__.py file. Parent Module '' Not Loaded The original specification for sys.meta_path was PEP 302, with subsequent extension in PEP 420.

TestCase.py =================== from myapp import SomeObject # some tests on SomeObject However, I'm definitely doing something wrong as Python can't see that myapp is a module: ImportError: No module named myapp This post applies specifically to Python 2.7.9, but I'm guessing Python 3x works very similarly. IPython will look for modules to import that are not only found in your sys.path, but also on your current working directory. read review Safety - Improve braking power in wet conditions On which point(s) in a jet engine does the reaction force act?

great help... Attempted Relative Import In Non-package The package was somehow installed with root rw permission only, other user just cannot rw to it! share|improve this answer answered Oct 1 '13 at 19:40 pandorabob 313 add a comment| up vote 2 down vote Doing sys.path.append('my-path-to-module-folder') will work, but to avoid having to do this in References¶ The import machinery has evolved considerably since Python's early days.

Import Error Python No Module Named

What's going on, and how can I fix it? this page Changed in version 3.4: Use of loader.module_repr() has been deprecated and the module spec is now used by the import machinery to generate a module repr. Python Can't Find Module In Site-packages By implementing get_data(), a loader can allow calling applications to support retrieval of data associated with the package without considering how the package is actually installed (especially without assuming that the Importerror Python Cannot Import Name python module share|improve this question asked Jul 13 '14 at 11:33 Philipp_Kats 3031313 How are you executing the script?

Submodules 5.4.3. http://amigasuperbit.com/python-cannot/python-cannot-find-site-module.html Why is (a % 256) different than (a & 0xFF)? UPDATE: even better, use python -m pip install . For example, importing the package created above: import sys import sys_shelve_importer def show_module_details(module): print ' message :', module.message print ' __name__ :', module.__name__ print ' __package__:', module.__package__ print ' __file__ :', Python Can't Import Installed Module

no $PYTHONPATH at the beginning, to include anything else already defined - you definitely DO want to do that with $PATH and other UNIX system variables, though) python and ipython read If the module has a spec (__spec__), the import machinery will try to generate a repr from it. It drove me crazy until I noticed that sys.path was different after I had imported from the parent project. this content To help organize modules and provide a naming hierarchy, Python has a concept of packages.

You'll just source the virtualenv and then you will be using local (to the project) packages. Python Import Module From Directory The meta path¶ When the named module is not found in sys.modules, Python next searches sys.meta_path, which contains a list of meta path finder objects. If others confirm this cause, may want to amend the answer accordingly? –Brandyn Mar 9 '15 at 3:30 Adding to jozxyqk comment's: make sure you got the right directory

This is due to the fact that blocks guarded by class="pre">if __name__ == "__main__": checks only execute when the module is used to populate the __main__

imp.find_module can be used to find a module: > import imp > imp.find_module('numpy') (None, '/usr/local/lib/python2.7/dist-packages/numpy', ('', '', 5)) You can also import and arbitrary Python source as a module using imp.load_source. share|improve this answer edited Apr 26 at 23:37 answered Jan 14 at 19:12 Dan H 4,43231523 add a comment| up vote 2 down vote The Python import mechanism works, really, so, package_dir_a = os.path.join(base_dir, 'package_dir_a') sys.path.insert(0, package_dir_a) # Import the example module import example print 'Imported example from:', example.__file__ print '\t', example.DATA # Make package_dir_b the first directory in the search path Python Import Error If that fails or there is no spec, the import system will craft a default repr using whatever information is available on the module.

looking for data in /tmp/pymotw_import_example.shelve for "/tmp/pymotw _import_example.shelve/foo" Traceback (most recent call last): File "sys_shelve_importer_get_data.py", line 29, in foo = pkgutil.get_data('package', 'foo') File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2. 7/pkgutil.py", line 583, in get_data return This name may come from various arguments to the import statement, or from the parameters to the importlib.import_module() or __import__() functions. The module cache 5.3.2. have a peek at these guys copy from PEP 395). 5.9.

share|improve this answer answered Jul 24 '15 at 1:08 z0r 2,67811832 having used miniconda to install a bunch of python related stuff I also got exactly this problem. How can I take a powerful plot item away from players without frustrating them? This mapping serves as a cache of all modules that have been previously imported, including the intermediate paths. This particular trap has been largely eliminated in Python 3.2 and later.

The indirect effect of this is that an imported module may replace itself in sys.modules. Why dd takes too long? For TestCase.py, do from ..myapp import SomeObject However, this will work only if you are importing TestCase from the package. Each missing directory is associated with an imp.NullImporter instance, since modules cannot be imported from directories that do not exist.

import contextlib import imp import os import shelve import sys @contextlib.contextmanager def shelve_context(filename, flag='r'): """Context manager to make shelves work with 'with' statement.""" db = shelve.open(filename, flag) try: yield db finally: It may help to know. PEP 420 introduced namespace packages for Python 3.3. The file does not need to exist to set this attribute; the path can simply point to where the compiled file would exist (see PEP 3147).

Again, don't use sudo in this case... What is this good for? The import system passes in a target module only during reload. Searching 5.3.1.

By default on Mac OS X + Enthought Python Distribution, it doesn't - so the commands in my previous posts only needed to be: (.tcshrc) setenv PYTHONPATH /Users/riedel/Code/Python/:/Users/riedel/Code/Python/BDNYC:/Users/riedel/Code/Python/BDNYC/BDtools:/Users/riedel/Code/Python/BDNYC/BDdatabase:/Users/riedel/Code/Python/BDNYC/BDmisc and (.bashrc) PYTHONPATH=”/Users/riedel/Code/Python/:/Users/riedel/Code/Python/BDNYC:/Users/riedel/Code/Python/BDNYC/BDtools:/Users/riedel/Code/Python/BDNYC/BDdatabase:/Users/riedel/Code/Python/BDNYC/BDmisc”
__import__() is used to perform the name binding operation of the import statement.