Home > Python Exception > Python Import Error Exception

Python Import Error Exception


Base classes 5.2. New in version 2.5. Also, this exception derives directly from BaseException and not StandardError, since it is not technically an error. User code can raise built-in exceptions. http://vealcine.com/python-exception/python-key-error-exception.php

Some built-in exceptions (like IOError) expect a certain number of arguments and assign a special meaning to the elements of this tuple, while others are usually called only with a More information on defining exceptions is available in the Python Tutorial under User-defined Exceptions. Thankyouthankyouthankyou. –espais Jun 15 at 16:17 add a comment| up vote 11 down vote To mark a directory as a package you need a file named __init__.py, does this help? exception FutureWarning¶ Base class for warnings about constructs that will change semantically in the future. https://docs.python.org/2/library/exceptions.html

Python Exceptions List

How exactly (in terms of code) are Entity and Physics linked to each other? physics.py is imported from entity before class Ent is defined and physics tries to import entity that is already initializing. exception ArithmeticError¶ The base class for those built-in exceptions that are raised for various arithmetic errors: OverflowError, ZeroDivisionError, FloatingPointError. The built-in exceptions listed below can be generated by the interpreter or built-in functions.

Human vs apes: What advantages do humans have over apes? For example, an unqualified variable name. winerror¶ Under Windows, this gives you the native Windows error code. Python Valueerror Example If from X import Y is used and Y cannot be found inside the module X, an ImportError is raised.

It is a subclass of UnicodeError. Navigation index modules | next | previous | Python » 3.5.2 Documentation » The Python Standard Library » | 5. 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 http://stackoverflow.com/questions/14750711/catch-python-importerror-if-import-from-source-directory You can get the name of the missing module from a ImportError instance using the message property.

It can be solved without any structural modifications to the code. Python Exception Class Methods exception VMSError¶ Only available on VMS. For example, if the entry point of your script is main.py: if __name__ == '__main__': try: import module1 import module2 module1.main() except ImportError as error: print "You don't have module {0} For class exceptions, in a try statement with an except clause that mentions a particular class, that clause also handles any exception classes derived from that class (but not

  1. Unfortunately Python's exceptions are an example of a stringly typed API, and one of the worst.
  2. exception ImportWarning¶ Base class for warnings about probable mistakes in module imports.
  3. To make things slightly more difficult, I also change the names of the packages when I import them -- for example, matplotlib gets abbreviated to mp.

Python Custom Exception

Since I run Ubuntu, this is what I did) 1) Change directory (cd) to the directory above the directory where your files are. The import hook protocol also specifies that a module can inject __loader__ into the frame so that the source can be loaded from the __loader__ if the source is not based Python Exceptions List Since sys.path usually contains . (the current directory), that's probably what you meant by being in the source directory. Python Filenotfounderror You need the directory to contain the __init__.py file, which is the file that initializes the package.

This cannot occur for long integers (which would rather raise MemoryError than give up) and for most operations with plain integers, which return a long integer instead. weblink Corresponds to errno EEXIST. Warnings¶ The following exceptions are used as warning categories; see the warnings module for more information. A common use in the standard Python library is to try to import a module, and then check whether it worked. Python Exception Message

Easiest way I found to do this was to navigate to my project folder in Windows explorer and searching for *.pyc, then selecting all (Ctrl+A) and deleting them (Ctrl+X). Not the answer you're looking for? import gc import weakref class ExpensiveObject(object): def __init__(self, name): self.name = name def __del__(self): print '(Deleting %s)' % self obj = ExpensiveObject('obj') p = weakref.proxy(obj) print 'BEFORE:', p.name obj = None navigate here Dave python error-handling module cross-platform share|improve this question edited Aug 5 '14 at 20:46 smci 7,55043878 asked Jun 28 '10 at 9:15 Dave Schultz 71113 2 the "imp" module should

exception DeprecationWarning¶ Base class for warnings about deprecated features. Python Errno Because I work on many systems, however, not all modules may be able to load on any particular machine. Can anyone identify the city in this photo?

exception SystemExit¶ This exception is raised by the sys.exit() function.

import unittest class AssertionExample(unittest.TestCase): def test(self): self.failUnless(False) unittest.main() $ python exceptions_AssertionError_unittest.py F ====================================================================== FAIL: test (__main__.AssertionExample) ---------------------------------------------------------------------- Traceback (most recent call last): File "exceptions_AssertionError_unittest.py", line 17, in test self.failUnless(False) AssertionError: False In this last case, args contains the verbatim constructor arguments as a tuple. exception IsADirectoryError¶ Raised when a file operation (such as os.remove()) is requested on a directory. Python Attributeerror Object Has No Attribute Navigation index modules | next | previous | Python » 2.7.12 Documentation » The Python Standard Library » 6.

The associated value is a string indicating what went wrong (in low-level terms). share|improve this answer answered Feb 7 '13 at 12:18 isedev 9,82411942 Thanks for the quick answer. See also exceptions The standard library documentation for this module. http://vealcine.com/python-exception/python-error-vs-exception.php Finally, you've answered your own question, more or less: try: from _foo import * except ImportError: raise ImportError('') Alternatively, you could check the contents of sys.path, the

The interpreter does not raise this exception itself very often, but some user code does. SyntaxWarning Used for questionable syntax. The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid strerror¶ The corresponding error message, as provided by the operating system.

from foo import ... >>> importerror: no module named foo share|improve this answer answered Jan 9 '14 at 19:45 Iasmini Gomes 334 add a comment| up vote 3 down vote Disclaimer: