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python-patterns/null.py at master · sxfmol/python-patterns · GitHub
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null.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""http://code.activestate.com/recipes/68205-null-object-design-pattern/"""
class
Null
:
def
__init__
(
self
,
*
args
,
**
kwargs
):
"""Ignore parameters."""
return
None
def
__call__
(
self
,
*
args
,
**
kwargs
):
"""Ignore method calls."""
return
self
def
__getattr__
(
self
,
mname
):
"""Ignore attribute requests."""
return
self
def
__setattr__
(
self
,
name
,
value
):
"""Ignore attribute setting."""
return
self
def
__delattr__
(
self
,
name
):
"""Ignore deleting attributes."""
return
self
def
__repr__
(
self
):
"""Return a string representation."""
return
"<Null>"
def
__str__
(
self
):
"""Convert to a string and return it."""
return
"Null"
def
test
():
"""
Perform some decent tests, or rather: demos.
>>> print(Null())
Null
>>> print(Null('value'))
Null
>>> n= Null('vale',param='value')
>>> print(n)
Null
>>> n()
<Null>
>>> n('value')
<Null>
>>> n('value', param='value')
<Null>
>>> print(n)
Null
"""
# constructing and calling
#n = Null()
#print(n)
#n = Null('value')
#print(n)
n
=
Null
(
'value'
,
param
=
'value'
)
#print(n)
n
()
#n('value')
#n('value', param='value')
#print(n)
# attribute handling
n
.
attr1
print
(
'attr1'
,
n
.
attr1
)
n
.
attr1
.
attr2
n
.
method1
()
n
.
method1
().
method2
()
n
.
method
(
'value'
)
n
.
method
(
param
=
'value'
)
n
.
method
(
'value'
,
param
=
'value'
)
n
.
attr1
.
method1
()
n
.
method1
().
attr1
n
.
attr1
=
'value'
n
.
attr1
.
attr2
=
'value'
del
n
.
attr1
del
n
.
attr1
.
attr2
.
attr3
# representation and conversion to a string
assert
repr
(
n
)
==
'<Null>'
assert
str
(
n
)
==
'Null'
if
__name__
==
'__main__'
:
test
()
import
doctest
doctest
.
testmod
()
### OUTPUT ###
# ('attr1', <Null>)
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