Python Standard Exceptions
Raised when the next() method of an iterator does not point to any object.
Raised by the sys.exit() function.
Base class for all built-in exceptions except StopIteration and SystemExit.
Base class for all errors that occur for numeric calculation.
Raised when a calculation exceeds maximum limit for a numeric type.
Raised when a floating point calculation fails.
Raised when division or modulo by zero takes place for all numeric types.
Raised in case of failure of the Assert statement.
Raised in case of failure of attribute reference or assignment.
Raised when there is no input from either the raw_input() or input() function and the end of file is reached.
Raised when an import statement fails.
Raised when the user interrupts program execution, usually by pressing Ctrl+c.
Base class for all lookup errors.
Raised when an index is not found in a sequence.
Raised when the specified key is not found in the dictionary.
Raised when an identifier is not found in the local or global namespace.
Raised when trying to access a local variable in a function or method but no value has been assigned to it.
Base class for all exceptions that occur outside the Python environment.
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.
Raised for operating system-related errors.
Raised when there is an error in Python syntax.
Raised when indentation is not specified properly.
Raised when the interpreter finds an internal problem, but when this error is encountered the Python interpreter does not exit.
Raised when Python interpreter is quit by using the sys.exit() function. If not handled in the code, causes the interpreter to exit.
Raised when an operation or function is attempted that is invalid for the specified data type.
Raised when the built-in function for a data type has the valid type of arguments, but the arguments have invalid values specified.
Raised when a generated error does not fall into any category.
Raised when an abstract method that needs to be implemented in an inherited class is not actually implemented.
Python Built-in Exceptions
The table below shows built-in exceptions that are usually raised in Python:
| Exception | Description |
|---|---|
| ArithmeticError | Raised when an error occurs in numeric calculations |
| AssertionError | Raised when an assert statement fails |
| AttributeError | Raised when attribute reference or assignment fails |
| Exception | Base class for all exceptions |
| EOFError | Raised when the input() method hits an «end of file» condition (EOF) |
| FloatingPointError | Raised when a floating point calculation fails |
| GeneratorExit | Raised when a generator is closed (with the close() method) |
| ImportError | Raised when an imported module does not exist |
| IndentationError | Raised when indentation is not correct |
| IndexError | Raised when an index of a sequence does not exist |
| KeyError | Raised when a key does not exist in a dictionary |
| KeyboardInterrupt | Raised when the user presses Ctrl+c, Ctrl+z or Delete |
| LookupError | Raised when errors raised cant be found |
| MemoryError | Raised when a program runs out of memory |
| NameError | Raised when a variable does not exist |
| NotImplementedError | Raised when an abstract method requires an inherited class to override the method |
| OSError | Raised when a system related operation causes an error |
| OverflowError | Raised when the result of a numeric calculation is too large |
| ReferenceError | Raised when a weak reference object does not exist |
| RuntimeError | Raised when an error occurs that do not belong to any specific exceptions |
| StopIteration | Raised when the next() method of an iterator has no further values |
| SyntaxError | Raised when a syntax error occurs |
| TabError | Raised when indentation consists of tabs or spaces |
| SystemError | Raised when a system error occurs |
| SystemExit | Raised when the sys.exit() function is called |
| TypeError | Raised when two different types are combined |
| UnboundLocalError | Raised when a local variable is referenced before assignment |
| UnicodeError | Raised when a unicode problem occurs |
| UnicodeEncodeError | Raised when a unicode encoding problem occurs |
| UnicodeDecodeError | Raised when a unicode decoding problem occurs |
| UnicodeTranslateError | Raised when a unicode translation problem occurs |
| ValueError | Raised when there is a wrong value in a specified data type |
| ZeroDivisionError | Raised when the second operator in a division is zero |