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Python Key Error Exception


The filename attribute is None when this exception is created with other than 3 arguments. exception IOError¶ Raised when an I/O operation (such as a print statement, the built-in open() function or a method of a file object) fails for an I/O-related reason, e.g., custom error raising) Table Of Contents 1.2.8. exception MemoryError¶ Raised when an operation runs out of memory but the situation may still be rescued (by deleting some objects). http://caribtechsxm.com/python-exception/python-io-error-exception.php

Raised when a VMS-specific error occurs. warnings Non-error warning messages. Why don't browser DNS caches mitigate DDOS attacks on DNS providers? The associated value is a string giving details about the type mismatch. look at this site

Python Exceptions List

Navigation index modules | next | previous | Python » 2.7.12 Documentation » The Python Standard Library » © Copyright 1990-2016, Python Software Foundation. Please donate. structure: >>> try: ...

Where's the 0xBEEF? exception ImportError¶ Raised when an import statement fails to find the module definition or when a from ... import fails to find a name that is to In this last case, args contains the verbatim constructor arguments as a tuple. Python Valueerror Example I realize the above example is something of a straw-man argument, and is in fact intentionally bad.

exception UserWarning¶ Base class for warnings generated by user code. Python Filenotfounderror You may also use second argument to specify the default value, if the key is not present. See also PEP 3151 - Reworking the OS and IO exception hierarchy 5.3. https://docs.python.org/3/library/exceptions.html Changed in version 3.5: Introduced the RuntimeError transformation.

StopIteration) or not (e.g. Python Exception Class Methods except SomeException: tb = sys.exc_info()[2] raise OtherException(...).with_traceback(tb) exception Exception¶ All built-in, non-system-exiting exceptions are derived from this class. share|improve this answer answered May 5 '15 at 12:10 kenorb 22.2k9155128 add a comment| up vote 0 down vote I dont think python has a catch :) try: connection = manager.connect("I2Cx") Last updated on Sep 23, 2016.

Python Filenotfounderror

start¶ The first index of invalid data in object. click to read more See the module errno, which contains names for the error codes defined by the underlying operating system. Python Exceptions List share|improve this answer edited Apr 22 '13 at 18:36 answered Apr 22 '13 at 18:25 RichieHindle 147k34252334 add a comment| up vote 1 down vote You can also try to use Python Custom Exception Try again...

The constructor accepts the same optional argument passed to sys.exit(). http://caribtechsxm.com/python-exception/python-3-io-error-exception.php Concrete exceptions¶ The following exceptions are the exceptions that are usually raised. When raising a new exception (rather than using a bare raise to re-raise the exception currently being handled), the implicit exception context can be supplemented with an explicit cause by exception SystemExit¶ This exception is raised by the sys.exit() function. Python Exception Message

Corresponds to errno ECONNABORTED. exception Warning¶ Base class for warning categories. The second form of the constructor sets the corresponding attributes, described below. have a peek at these guys Looks like you have to consult sys.exc_info() to get the exception in a bare except: clause, so it's probably simpler to omit it. –Aya Apr 22 '13 at 18:58 1

code¶ The exit status or error message that is passed to the constructor. (Defaults to None.) exception TypeError¶ Raised when an operation or function is applied to an object Python Errno 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. If the exception class is derived from the standard root class BaseException, the associated value is present as the exception instance's args attribute.

When set they represent the name of the module that was attempted to be imported and the path to any file which triggered the exception, respectively.

The built-in exceptions listed below can be generated by the interpreter or built-in functions. end¶ The index after the last invalid data in object. exception NotADirectoryError¶ Raised when a directory operation (such as os.listdir()) is requested on something which is not a directory. Python Attributeerror Object Has No Attribute New in version 2.0.

It is not meant to be directly inherited by user-defined classes (for that, use Exception). exception NotImplementedError¶ This exception is derived from RuntimeError. New in version 1.5.2. check my blog This can be raised directly by codecs.lookup().

But if I do: try: connection = manager.connect("I2Cx") except Exception, e: print e It doesn't print anything for e. Two exception classes that are not related via subclassing are never equivalent, even if they have the same name. The associated value is a string indicating what kind of (internal) operation ran out of memory. Found a bug?

while True: data = raw_input('prompt:') print 'READ:', data $ echo hello | python PyMOTW/exceptions/exceptions_EOFError.py prompt:READ: hello prompt:Traceback (most recent call last): File "PyMOTW/exceptions/exceptions_EOFError.py", line 13, in data = raw_input('prompt:') EOFError: New in version 2.2. Corresponds to errno EAGAIN, EALREADY, EWOULDBLOCK and EINPROGRESS. Found a bug?

Corresponds to errno EEXIST. reason¶ A string describing the specific codec error. exception RuntimeError¶ Raised when an error is detected that doesn't fall in any of the other categories. exception FileExistsError¶ Raised when trying to create a file or directory which already exists.

exception IndexError¶ Raised when a sequence subscript is out of range. (Slice indices are silently truncated to fall in the allowed range; if an index is not a plain integer, close() method is called. try/finally¶ In [10]: try: ....: x = int(raw_input('Please enter a number: ')) ....: finally: ....: print('Thank you for your input') ....: ....: Please enter a number: a Thank you for your But given the pythonic creed of better to ask forgiveness than permission I can't help but feel like it begs the question of where the line in the sand actually is