Python abnormal learning 9--

Python uses objects to represent abnormal abnormal state, and throws an exception if an error is encountered.

 

raise statement can throw an exception, or instance of a class as an argument.

>>> The raise Exception      # -induced abnormalities are common, did not point out what is wrong 
Traceback (MOST recent Results Last Call): 
  File " <pyshell # 120> " , Line 1, in <Module>
     The raise Exception 
Exception
 >>> 
>>> the raise Exception ( ' the hyperdrive overload ' )    # added overload error message yperdrive 
Traceback (MOST Recent Last Call): 
  File " <125 pyshell #> " , Line. 1, in <Module1>
     the raise Exception ( 'hyperdrive overload')
Exception: hyperdrive overload

 

Some built-in exception classes

The class name	description
Exception	Almost all exception classes are derived from it come
AttributeError	When referring to property caused by or assigned to it fail
OSError	Raised when the operating system can not perform the specified tasks (such as opening a file), a number of sub-categories
IndexError	When using initiators index sequence does not exist, for the subclass LookupError
KeyError	When using initiators key mapping does not exist for the subclass LookupError
NameError	Raised when a name is not found (variable)
SyntaxError	Raised when code is incorrect
TypeError	When the initiator or the built-in functions for the operation of the object type is incorrect
ValueError	When the initiator or the built-in functions for operating such an object: it contains the correct type of value but unsuitable
ZeroDivisionError	Raised when division or modulo the second parameter is zero

 

to be continued......