Janne Peräaho at 02:36, 24 June 2020

2020-06-24T02:36:05Z

← Older revision		Revision as of 02:36, 24 June 2020
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	\|EOFError \|\| Raised when there is no input from either the raw_input() or input() function and the end of file is reached.		\|EOFError \|\| Raised when there is no input from either the raw_input() or input() function and the end of file is reached.
	\|-		\|-
			\|KeyboardInterrupt \|\| Raised when the user interrupts program execution, usually by pressing <kbd class="keyboard-key nowrap" style="border: 1px solid #aaa; border-radius: 0.2em; box-shadow: 0.1em 0.2em 0.2em #ddd; background-color: #f9f9f9; background-image: -moz-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: -o-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: -webkit-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: linear-gradient(to bottom, #eee, #f9f9f9, #eee); padding: 0.1em 0.3em; font-family: inherit; font-size: 0.85em;">Ctrl</kbd> + <kbd class="keyboard-key nowrap" style="border: 1px solid #aaa; border-radius: 0.2em; box-shadow: 0.1em 0.2em 0.2em #ddd; background-color: #f9f9f9; background-image: -moz-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: -o-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: -webkit-linear-gradient(top, #eee, #f9f9f9, #eee); background-image: linear-gradient(to bottom, #eee, #f9f9f9, #eee); padding: 0.1em 0.3em; font-family: inherit; font-size: 0.85em;">C</kbd>.
	\|KeyboardInterrupt \|\| Raised when the user interrupts program execution, usually by pressing Ctrl+c.
	\|}		\|}

Janne Peräaho: Added exceptions and class hierarchy

2018-07-15T10:39:47Z

Added exceptions and class hierarchy

New page

; Table A-1. Language Exceptions
{| class="wikitable"
! Name !! Explanation
|-
|StandardError || Base class for all built-in exceptions except StopIteration and SystemExit.
|-
|ImportError || Raised when an import statement fails.
|-
|SyntaxError || Raised when there is an error in Python syntax.
|-
|IndentationError || Raised when indentation is not specified properly.
|-
|NameError || Raised when an identifier is not found in the local or global namespace.
|-
|UnboundLocalError || Raised when trying to access a local variable in a function or method but no value has been assigned to it.
|-
|TypeError || Raised when an operation or function is attempted that is invalid for the specified data type.
|-
|LookupError || Base class for all lookup errors.
|-
|IndexError || Raised when an index is not found in a sequence.
|-
|KeyError || Raised when the specified key is not found in the dictionary.
|-
|ValueError || Raised when the built-in function for a data type has the valid type of arguments, but the arguments have invalid values specified.
|-
|RuntimeError || Raised when a generated error does not fall into any category.
|-
| MemoryError || Raised when a operation runs out of memory.
|-
| RecursionError || Raised when the maximum recursion depth has been exceeded.
|-
|SystemError || Raised when the interpreter finds an internal problem, but when this error is encountered the Python interpreter does not exit.
|}

; Table A-2. Math Exceptions
{| class="wikitable"
! Name !! Explanation
|-
|ArithmeticError || Base class for all errors that occur for numeric calculation. You know a math error occurred, but you don’t know the specific error.
|-
|OverflowError || Raised when a calculation exceeds maximum limit for a numeric type.
|-
|FloatingPointError || Raised when a floating point calculation fails.
|-
|ZeroDivisonError || Raised when division or modulo by zero takes place for all numeric types.
|}

; Table A-3. I/O Exceptions
{| class="wikitable"
! Name !! Explanation
|-
|FileNotFoundError || Raised when a file or directory is requested but doesn’t exist.
|-
|IOError || Raised when an input/ output operation fails, such as the print statement or the open() function when trying to open a file that does not exist. Also raised for operating system-related errors.
|-
|PermissionError || Raised when trying to run an operation without the adequate access rights.
|-
|EOFError || Raised when there is no input from either the raw_input() or input() function and the end of file is reached.
|-
|KeyboardInterrupt || Raised when the user interrupts program execution, usually by pressing Ctrl+c.
|}

; Table A-4. Other Exceptions
{| class="wikitable"
! Name !! Explanation
|-
|Exception || Base class for all exceptions. This catches most exception messages.
|-
|StopIteration || Raised when the next() method of an iterator does not point to any object.
|-
|AssertionError || Raised in case of failure of the Assert statement.
|-
|SystemExit || Raised when Python interpreter is quit by using the sys.exit() function. If not handled in the code, it causes the interpreter to exit.
|-
|OSError || Raises for operating system related errors.
|-
|EnvironmentError || Base class for all exceptions that occur outside the Python environment.
|-
|AttributeError || Raised in case of failure of an attribute reference or assignment.
|-
|NotImplementedError || Raised when an abstract method that needs to be implemented in an inherited class is not actually implemented.
|}

; Figure A-1. Built-in Exceptions' Class Hierarchy
All exceptions are objects. The classes that define the objects are organized in a hierarchy, which is shown below.
BaseException
+-- SystemExit
+-- KeyboardInterrupt
+-- GeneratorExit
+-- Exception
+-- StopIteration
+-- StopAsyncIteration
+-- ArithmeticError
| +-- FloatingPointError
| +-- OverflowError
| +-- ZeroDivisionError
+-- AssertionError
+-- AttributeError
+-- BufferError
+-- EOFError
+-- ImportError
| +-- ModuleNotFoundError
+-- LookupError
| +-- IndexError
| +-- KeyError
+-- MemoryError
+-- NameError
| +-- UnboundLocalError
+-- OSError
| +-- BlockingIOError
| +-- ChildProcessError
| +-- ConnectionError
| | +-- BrokenPipeError
| | +-- ConnectionAbortedError
| | +-- ConnectionRefusedError
| | +-- ConnectionResetError
| +-- FileExistsError
| +-- FileNotFoundError
| +-- InterruptedError
| +-- IsADirectoryError
| +-- NotADirectoryError
| +-- PermissionError
| +-- ProcessLookupError
| +-- TimeoutError
+-- ReferenceError
+-- RuntimeError
| +-- NotImplementedError
| +-- RecursionError
+-- SyntaxError
| +-- IndentationError
| +-- TabError
+-- SystemError
+-- TypeError
+-- ValueError
| +-- UnicodeError
| +-- UnicodeDecodeError
| +-- UnicodeEncodeError
| +-- UnicodeTranslateError
+-- Warning
+-- DeprecationWarning
+-- PendingDeprecationWarning
+-- RuntimeWarning
+-- SyntaxWarning
+-- UserWarning
+-- FutureWarning
+-- ImportWarning
+-- UnicodeWarning
+-- BytesWarning
+-- ResourceWarning

AmigaOS Manual: Standard Exceptions - Revision history

Janne Peräaho at 02:36, 24 June 2020

Janne Peräaho: Added exceptions and class hierarchy