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Python Key Error Exception


Changed in version 3.3: Added the name and path attributes. Browse other questions tagged python try-catch except or ask your own question. It is not meant to be directly inherited by user-defined classes (for that, use Exception). object¶ The object the codec was attempting to encode or decode. this contact form

It is raised when the interpreter detects that the maximum recursion depth (see sys.getrecursionlimit()) is exceeded. The errno attribute is a numeric error code from errno, and the strerror attribute is the corresponding string, as would be printed by the C function perror(). This module never needs to be imported explicitly: the exceptions are provided in the built-in namespace as well as the exceptions module. exception DeprecationWarning¶ Base class for warnings about deprecated features. http://stackoverflow.com/questions/16154032/catch-keyerror-in-python

Python Exceptions List

The associated value is a string indicating what precisely went wrong. This can be while importing a module, invoking exec, or calling eval(). exception UnicodeWarning¶ Base class for warnings related to Unicode.

  1. exception IsADirectoryError¶ Raised when a file operation (such as os.remove()) is requested on a directory.
  2. The associated value is a string indicating the type of the operands and the operation.
  3. exception TimeoutError¶ Raised when a system function timed out at the system level.
  4. If the exception class is derived from the standard root class BaseException, the associated value is present as the exception instance's args attribute.
  5. This is a subclass of SyntaxError.
  6. exception BaseException¶ The base class for all built-in exceptions.
  7. It is usually used in exception handling code like this: try: ...
  8. The associated value is a string indicating what kind of (internal) operation ran out of memory.
  9. The associated value is a string indicating what went wrong (in low-level terms).
  10. I've learned a valuable lesson which I'd heard before but managed to neglect taking to heart: "If you feel like you're writing too much code, stop and look to the language

Exception handling in Python¶ It is likely that you have raised Exceptions if you have typed all the previous commands of the tutorial. This may be a string or a tuple containing several items of information (e.g., an error code and a string explaining the code). The exception inherits from BaseException so as to not be accidentally caught by code that catches Exception and thus prevent the interpreter from exiting. Python Valueerror Example exception MemoryError¶ Raised when an operation runs out of memory but the situation may still be rescued (by deleting some objects).

Catching exceptions¶ Python Filenotfounderror The interpreter does not raise this exception itself very often, but some user code does. exception UnicodeDecodeError¶ Raised when a Unicode-related error occurs during decoding. When an EnvironmentError exception is instantiated with a 3-tuple, the first two items are available as above, while the third item is available on the filename attribute.

This applies only to unqualified names. Python Exception Class Methods The os._exit() function can be used if it is absolutely positively necessary to exit immediately (for example, in the child process after a call to os.fork()). Exception handling in Python Corresponds to errno EINTR.

Python Filenotfounderror

BaseException¶ Base class for all exceptions. Navigation index modules | next | previous | Python » 3.5.2 Documentation » The Python Standard Library » | 5. Python Exceptions List 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 Python Custom Exception Instances of this class have attributes filename, lineno, offset and text for easier access to the details. str() of the exception instance returns only the message.

It is formatted by the C functions perror() under POSIX, and FormatMessage() under Windows. http://vealcine.com/python-exception/python-error-vs-exception.php All user-defined exceptions should also be derived from this class. When a generator or coroutine function returns, a new StopIteration instance is raised, and the value returned by the function is used as the value parameter to the constructor If str() or unicode() is called on an instance of this class, the representation of the argument(s) to the instance are returned, or the empty string when there were Python Exception Message

Last updated on Sep 20, 2016. The winerror and class="pre">strerror values are created from the return values of the GetLastError() and FormatMessage() functions from the Windows Platform API. None) or you do if data: do_work(data). navigate here exception SyntaxError¶ Raised when the parser encounters a syntax error.

exception IndentationError¶ Base class for syntax errors related to incorrect indentation. Python Errno Cooking inside a hotel room Can I send ethereum to a contract outside of its constructor? import math import fpectl print 'Control off:', math.exp(1000) fpectl.turnon_sigfpe() print 'Control on:', math.exp(1000) GeneratorExit¶ Raised inside a generator the generator's close() method is called.

The errno value maps the winerror value to corresponding errno.h values.

The filename attribute is None when this exception is created with other than 3 arguments. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the exception ValueError¶ Raised when a built-in operation or function receives an argument that has the right type but an inappropriate value, and the situation is not described by a more precise Python Attributeerror Object Has No Attribute The associated value is the second argument to the raise statement.

exception ConnectionRefusedError¶ A subclass of ConnectionError, raised when a connection attempt is refused by the peer. The following exceptions are only used as base classes for other exceptions. exception AssertionError¶ Raised when an assert statement fails. http://vealcine.com/python-exception/python-3-io-error-exception.php exception EnvironmentError¶ The base class for exceptions that can occur outside the Python system: IOError, OSError.

try: connection = manager.connect("I2Cx") except Exception, e: print repr(e) ...you'll at least get the exception class name. import sys print 'Regular integer: (maxint=%s)' % sys.maxint try: i = sys.maxint * 3 print 'No overflow for ', type(i), 'i =', i except OverflowError, err: print 'Overflowed at ', i, The built-in exceptions listed below can be generated by the interpreter or built-in functions. encoding¶ The name of the encoding that raised the error.

PendingDeprecationWarning Used for features that are soon going to be deprecated. What kind of bugs do "goto" statements lead to? The associated value is a string indicating what kind of (internal) operation ran out of memory. Also, this exception derives directly from BaseException and not StandardError, since it is not technically an error.

You may want to look at the descriptions of the the built-in Exceptions when looking for the right exception type. print 1/0 $ python exceptions_ZeroDivisionError.py Traceback (most recent call last): File "exceptions_ZeroDivisionError.py", line 12, in print 1/0 ZeroDivisionError: integer division or modulo by zero Warning Categories¶ There are also several Please enter a number: 1 In [9]: x Out[9]: 1 Exceptions

exception SystemError¶ Raised when the interpreter finds an internal error, but the situation does not look so serious to cause it to abandon all hope. The associated value is a string giving details about the type mismatch. Instances of this class have attributes filename, lineno, offset and text for easier access to the details. str() of the exception instance returns only the message. It directly inherits from BaseException instead of StandardError since it is technically not an error.