Python3 Anomaly Detection

1. Standard exception

Assertionerror	Assertion statement (assert) failed
Attributeerror	Attempting to access an unknown object property
Eoferror	User input file End flag EOF (CTRL+D)
Floatingpointerror	Floating-point calculation error
Generatorexit	When the Generator.close () method is called
Importerror	When the import module fails
Indexerror	Index out of range of sequence
Keyerror	Find a keyword that does not exist in the dictionary
Keyboardinterrupt	User input interrupt key (CTRL + C)
Memoryerror	Memory overflow (can free memory by deleting objects)
Nameerror	Try to access a non-existent variable
Notimplementederror	Methods that have not been implemented
OSError	An exception generated by the operating system (for example, opening a file that does not exist)
Overflowerror	Numeric operation exceeds maximum limit
Referenceerror	Weak references (weak reference) attempt to access an object that has been reclaimed by the garbage collection mechanism
RuntimeError	General run-time errors
Stopiteration	There are no more values for iterators
SyntaxError	Syntax error for Python
Indentationerror	Indentation Error
Taberror	Use the tab and Space mix
Systemerror	Python Compiler system error
Systemexit	Python compiler process is closed
TypeError	Invalid operations between different types
Unboundlocalerror	Access an uninitialized local variable (subclass of Nameerror)
Unicodeerror	Unicode-related errors (subclasses of ValueError)
Unicodeencodeerror	Error in Unicode encoding (subclass of Unicodeerror)
Unicodedecodeerror	Error in Unicode decoding (subclass of Unicodeerror)
Unicodetranslateerror	Error in Unicode conversion (subclass of Unicodeerror)
ValueError	Invalid parameter passed in
Zerodivisionerror	Divide by zero

2. Hierarchy of built-in exception classes

Baseexception
+--Systemexit
+--Keyboardinterrupt
+--Generatorexit
+--Exception
+--stopiteration
+--Arithmeticerror
| +--Floatingpointerror
| +--Overflowerror
| +--Zerodivisionerror
+--Assertionerror
+--Attributeerror
+--Buffererror
+--Eoferror
+--Importerror
+--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
+--SyntaxError
| +--Indentationerror
| +--Taberror
+--Systemerror
+--TypeError
+--ValueError
| +--Unicodeerror
| +--unicodedecodeerror
| +--unicodeencodeerror
| +--unicodetranslateerror
+--Warning
+--deprecationwarning
+--pendingdeprecationwarning
+--runtimewarning
+--syntaxwarning
+--userwarning
+--futurewarning
+--importwarning
+--unicodewarning
+--byteswarning
+--resourcewarning

3. Exception Handling 1.try statement

Try

Detection Range

Except Exception [as reason]:

Code to be processed after exception appears

You can have multiple except and try combinations, because the detection range can produce multiple exceptions, and you can use multiple except and try combinations to focus on the exceptions you are interested in.

It is possible to use () to enclose multiple exceptions that require the same processing after the same processing of multiple-class exceptions except.

Try: Int ('ABC') Sum= 1+'1'F= Open ('I'm a non-existent document. txt')    Print(F.read ()) F.close ()except(OSError, Valueerror,typeerror) as reason:Print('Error t_t\n The cause of the error is:'+ str (reason))

2.try finally statement

Try

Detection Range

Except Exception [as reason]:

Code to be processed after exception appears

Finally

Be sure to do something (such as making a file close here after an error)

Try: F= Open ('My_file.txt')#The "my_file.txt" file does not exist in the current folder t_t    Print(F.read ())exceptOSError as Reason:Print('Error:'+str (reason))finally:    if 'F' inchLocals ():#If the file object variable exists in the current local variable symbol table, the open successF.close ()

3. Raise statement (throws an exception)

Raise Exception Name

Try :      for  in range (3):        as in range (3):            if i = = 2 :                 raise  keyboardinterrupt            print(i, j)except  Keyboardinterrupt:    print(' exit!  ')

Python3 Anomaly Detection