Exception,class Learning in Python

Exception,class Learning in Python

Instroduction:

Object2 = Object1 (like Java)

If Object1 is class object and then copy by reference;

If Object1 is basic type and then copy by value

1. exception

Main structure:

Try

Exception ValueError:

Exception Zerodivisionerror:

Exception Nameerror:

Exception TypeError:

exception

Finally

2. Custom exception

Class Error (Exception):
Pass

def myerror (Error):
def __init__ (Self,value):
Print value
Self.value = value
def __str__ (self):
return repr (Self.value)

3. Class

Class Bird:
Number = 0
def __init__ (self,name):
Self.name = Name
print ' Initializing%s '% self.name
def __del__ (self):
print ' del ', Self.number
Def fly (self):
print ' fly%d '% self.number
def add (self):
Self.number = Self.number + 1
def sub (self):
Self.number = Self.number-1
Class Sparrow (Bird):
def __init__ (Self,name,alias):
bird.__init__ (Self,name)
Self.alias = Alias
print ' Alias is%s '% Self.alias
Def fly (self):
print ' Sparrow fly%s '% Self.alias

Description

Constructor: __init__

destructor:__del__

Static Data:number

4. File Input/output

Cpickle or pickle:store the object consistently

Exception,class Learning in Python