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Python Cannot Import Function


found i t as package.__init__ loading source for "package" from shelf creating a new module object for "package" adding path for package execing source... The __init__.py trap¶ This is an all new trap added in Python 3.3 as a consequence of fixing the previous trap: if a subdirectory encountered on sys.path as part of Each of the path entry hooks in this list is called with a single argument, the path entry to be searched. 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__'] check over here

Only strings and bytes should be present on sys.path; all other data types are ignored. reload(foo) This statement does exactly what it looks like. 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. If any of the intermediate imports fail, an ImportError is raised. 5.3.1. http://stackoverflow.com/questions/9252543/importerror-cannot-import-name-x

Cannot Import Name Python

When reviewing Python code I like seeing where the given function or class comes from right where it is used. Specifically, any module that contains a __path__ attribute is considered a package. from foo import bar, bazThe meaning of this is pretty intuitive: it imports both bar and baz from the module foo.

The Path Based Finder¶ As mentioned previously, Python comes with several default meta path finders. I know what the second statement means, I have no idea what the first form means without backtracking to the bizarre import. –msw Nov 15 '15 at 17:54 add a comment| Import-related module attributes¶ The import machinery fills in these attributes on each module object during loading, based on the module's spec, before the loader executes the module. __name__¶ The __name__ Python Cannot Import Class The same rules used for class="pre">sys.path also apply to a package's __path__, and sys.path_hooks (described below) are consulted when traversing a package's __path__.

The original specification for sys.meta_path was PEP 302, with subsequent extension in PEP 420. Python Cannot Import Module The module created during loading and passed to exec_module() may not be the one returned at the end of import [2]. What should I change for … Problem importing module 2 replies Hello, I have few question regarding importing modules. Homepage Do the Leaves of Lórien brooches have any special significance or attributes?

A word of warning: this section and the previous both use the term finder, distinguishing between them by using the terms meta path finder and path entry finder. Circular Dependency Python So my questions are. These finders are queried in order to see if they know how to handle the named module. All of the standard library currently works that way, although some packages may open up their namespaces to third party contributions in future releases (specifically, it is almost certain the

Python Cannot Import Module

Message Insert Code Snippet Alt+I Code Inline Code Link H1 H2 Preview Submit your Reply Alt+S Ask a Different Software Development Question Related Articles Python and Matlab 3 replies Hello! https://www.daniweb.com/programming/software-development/threads/468359/can-t-import-function-from-module That way, inadvertently executing the main module twice becomes harmless. Cannot Import Name Python If that fails or there is no spec, the import system will craft a default repr using whatever information is available on the module. Python Circular Import Or put another way, packages are just a special kind of module.

Again, don't use sudo in this case... check my blog If they can find the named module, they return a module spec, an encapsulation of the module's import-related information, which the import machinery then uses when loading the module. Why are wavelengths shorter than visible light neglected by new telescopes? As with all my essays on this site, suggestions for improvement or requests for clarification can be posted on BitBucket. Python Local Import

more hot questions question feed lang-py about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Within the import machinery, it functions much the same as sys.path, i.e. Changed in version 3.4: find_spec() replaced find_loader() and find_module(), both of which are now deprecated, but will be used if find_spec() is not defined. this content Will I get the same result if I use 18-55mm lens at 55mm (full zoom) and 55-200mm lens at 55mm (no zoom), if not, then why?

This problem isn't even limited to the command line - if test_foo.py is open in Idle and you attempt to run it by pressing F5, or if you try to Python Detect Circular Import Will I get the same result if I use 18-55mm lens at 55mm (full zoom) and 55-200mm lens at 55mm (no zoom), if not, then why? There are many ways to import packages and modules - some are extremely common (found in pretty much every Python file ever written) and some less so.

When the first item (i.e.

more hot questions question feed lang-py about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation 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, How to capture disk usage percentage of a partition as an integer? Python Find Circular Dependencies The finder is responsible for locating a module and providing a loader to manage the actual import.

Can I substitute decaf coffee for espresso Do humans have an ethical obligation to prevent animal on animal violence? It will try to use the module.__name__, module.__file__, and module.__loader__ as input into the repr, with defaults for whatever information is missing. Can a text in Latin be understood by an educated Italian who never had any formal teaching of that language? http://amigasuperbit.com/cannot-import/python-cannot-import-name.html Should I allow my child to make an alternate meal if they do not like anything served at mealtime?

importlib Base classes and other tools for creating custom importers. Read the Docs v: latest Versions latest Downloads pdf htmlzip epub On Read the Docs Project Home Builds Free document hosting provided by Read the Docs. For example, if package spam has a submodule foo, after importing spam.foo, spam will have an attribute foo which is bound to the submodule. Second isn't that relevant to standard modules, but significant for you own modules, especially during development.

It also defines hooks for overriding the standard import behavior for special cases. The meta path 5.4. Follow me on Twitter , Facebook or Google+ Similar Posts PyCharm Settings Repository Python: Declaring Dynamic Attributes Understanding Python Class Instantiation Redirect Entire Domain with Flask PEP257 - a static linter The default contents of the path include the directory of the script used to start the application and the current working directory.

Changed in version 3.4: The import system has taken over the boilerplate responsibilities of loaders. Even if there is no initialisation code to run when the package is imported, an empty __init__.py file is still needed for the interpreter to find any modules or subpackages It turns out this is a really bad idea, as using such a name means the Python interpreter can no longer find the real socket module in the standard library, as import sys class NoisyImportFinder(object): PATH_TRIGGER = 'NoisyImportFinder_PATH_TRIGGER' def __init__(self, path_entry): print 'Checking NoisyImportFinder support for %s' % path_entry if path_entry != self.PATH_TRIGGER: print 'NoisyImportFinder does not work for %s' % path_entry

There will still be a difference, because the work done is slightly different, as different bytecode is generated and different codepaths are executed. –Martijn Pieters Jan 8 '15 at 11:44 2 You need to both reload foo and call from foo import bar again.Import LoopsAn import loop would occur in Python if you import two or more modules in a cycle. import sys import sys_shelve_importer filename = '/tmp/pymotw_import_example.shelve' sys.path_hooks.append(sys_shelve_importer.ShelveFinder) sys.path.insert(0, filename) try: import package.module3 except ImportError, e: print 'Failed to import:', e Other errors during the import are propagated. $ python sys_shelve_importer_missing.py Built with Sphinx using a theme provided by Read the Docs.

package imported done looking for data in /tmp/pymotw_import_example.shelve for "/tmp/pymotw _import_example.shelve/README" ============== package README ============== This is the README for ``package``.