Michael Yanowitz wrote:
> Is it possible to have a static variable in Python -
> a local variable in a function that retains its value.
>
> For example, suppose I have:
>
> def set_bit (bit_index, bit_value):
> static bits = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
> bits [bit_index] = bit_value
>
> print "\tBit Array:"
> int i
> while (i < len(bits):
> print bits[i],
> print '\n'
>
>
> I realize this can be implemented by making bits global, but can
> this be done by making it private only internal to set_bit()? I don't
> want bits to be reinitialized each time. It must retain the set values
> for the next time it is called.
>
>
> Thanks in advance:
> Michael Yanowitz
You can do things with function attributes
def foo(x):
foo.static += x
return foo.static
foo.static = 0
If you are going to set function attributes a lot, then you might like
to addd an attriute setter decorator to your toolbox:
def attributeSetter( **kw):
" decorator creator: initialises function attributes"
def func2(func):
" decorator: initialises function attributes"
func.__dict__.update(kw)
return func
return func2
def accumulator(n):
""" return an accumulator function that starts at n
>>> x3 = accumulator(3)
>>> x3.acc
3
>>> x3(4)
7
>>> x3.acc
7
"""
@attributeSetter(acc = n)
def accum(i):
accum.acc+= i
return accum.acc
return accum
- Paddy
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