Methods for using static variables in Python classes and functions

The examples in this article describe methods for using static variables in Python classes and functions. Share to everyone for your reference. The specific analysis is as follows:

The use of static variables in Python classes and functions (including the lambda method) seems to be something that is not possible [is impossible].

But there is always a solution, the following is to implement a class or function of the accumulator to introduce some of the more Non-mainstream method

Methods one, through the __init__ and __call__ methods of class

?

1 2 3 4 5 6 7 8 9 10 11

Class Foo:def __init__ (Self, n=0): SELF.N = n def __call__ (self, i): SELF.N = i return SELF.N a=foo () print a (1) print a (2) print a (3) print a (4)

Method Two, define a class in a function

?

1 2 3 4 5 6 7 8 9 10 11 12-13

def foo2 (n=0): Class Acc:def __init__ (self, s): Self.s = S def inc (self, i): Self.s = i return SELF.S return ACC (n). Inc A=foo2 () print a (1) print a (2) print a (3) print a (4)

Method three, using anonymous parameters on the heap

?

1 2 3 4 5 6 7 8 9 10

def foo3 (i, l=[]): If Len (L) ==0:l.append (0) l[0]+=i return l[0] Print Foo3 (1) Print Foo3 (2) Print Foo3 (3) Print Foo3 (4 )

Run in Python's official 2.6 environment,

The results of all three of these codes are

?

1 2 3 4

1 3 6 10

I hope this article will help you with your Python programming.