关于自动分配代码的某些问题会困扰我(主要是样式问题,但还有一个更严重的问题):
autoassign
没有分配’args’属性:
class Foo(object):
@autoassign
def __init__(self,a,b,c=False,*args):
pass
a=Foo(‘IBM’,’/tmp’,True, 100, 101) print(a.args)
autoassign
就像一个装饰者。但是autoassign(*argnames)
调用一个返回装饰器的函数。要实现这种魔力,autoassign
需要测试其第一个参数的类型。如果可以选择的话,我更喜欢函数而不是测试其参数的类型。
似乎有大量代码专门用于设置 sieve
,lambda中的lambda,ifilter和许多条件。
if kwargs:
exclude, f = set(kwargs['exclude']), None
sieve = lambda l:itertools.ifilter(lambda nv: nv[0] not in exclude, l)
elif len(names) == 1 and inspect.isfunction(names[0]): f = names[0] sieve = lambda l:l else: names, f = set(names), None sieve = lambda l: itertools.ifilter(lambda nv: nv[0] in names, l)
我认为可能有一种更简单的方法。(见下文)。
for key,value in defaults.iteritems():
assigned.setdefault(key,value)
这是一个替代性的更简单的实现,它具有与自动分配相同的功能(例如可以进行包含和排除),并且可以解决上述问题:
import inspect
import functools
def autoargs(*include, **kwargs):
def _autoargs(func):
attrs, varargs, varkw, defaults = inspect.getargspec(func)
def sieve(attr):
if kwargs and attr in kwargs['exclude']:
return False
if not include or attr in include:
return True
else:
return False
@functools.wraps(func)
def wrapper(self, *args, **kwargs):
# handle default values
if defaults:
for attr, val in zip(reversed(attrs), reversed(defaults)):
if sieve(attr):
setattr(self, attr, val)
# handle positional arguments
positional_attrs = attrs[1:]
for attr, val in zip(positional_attrs, args):
if sieve(attr):
setattr(self, attr, val)
# handle varargs
if varargs:
remaining_args = args[len(positional_attrs):]
if sieve(varargs):
setattr(self, varargs, remaining_args)
# handle varkw
if kwargs:
for attr, val in kwargs.items():
if sieve(attr):
setattr(self, attr, val)
return func(self, *args, **kwargs)
return wrapper
return _autoargs
这是我用来检查其行为的单元测试:
import sys
import unittest
import utils_method as um
class Test(unittest.TestCase):
def test_autoargs(self):
class A(object):
@um.autoargs()
def __init__(self,foo,path,debug=False):
pass
a=A('rhubarb','pie',debug=True)
self.assertTrue(a.foo=='rhubarb')
self.assertTrue(a.path=='pie')
self.assertTrue(a.debug==True)
class B(object):
@um.autoargs()
def __init__(self,foo,path,debug=False,*args):
pass
a=B('rhubarb','pie',True, 100, 101)
self.assertTrue(a.foo=='rhubarb')
self.assertTrue(a.path=='pie')
self.assertTrue(a.debug==True)
self.assertTrue(a.args==(100,101))
class C(object):
@um.autoargs()
def __init__(self,foo,path,debug=False,*args,**kw):
pass
a=C('rhubarb','pie',True, 100, 101,verbose=True)
self.assertTrue(a.foo=='rhubarb')
self.assertTrue(a.path=='pie')
self.assertTrue(a.debug==True)
self.assertTrue(a.verbose==True)
self.assertTrue(a.args==(100,101))
def test_autoargs_names(self):
class C(object):
@um.autoargs('bar','baz','verbose')
def __init__(self,foo,bar,baz,verbose=False):
pass
a=C('rhubarb','pie',1)
self.assertTrue(a.bar=='pie')
self.assertTrue(a.baz==1)
self.assertTrue(a.verbose==False)
self.assertRaises(AttributeError,getattr,a,'foo')
def test_autoargs_exclude(self):
class C(object):
@um.autoargs(exclude=('bar','baz','verbose'))
def __init__(self,foo,bar,baz,verbose=False):
pass
a=C('rhubarb','pie',1)
self.assertTrue(a.foo=='rhubarb')
self.assertRaises(AttributeError,getattr,a,'bar')
def test_defaults_none(self):
class A(object):
@um.autoargs()
def __init__(self,foo,path,debug):
pass
a=A('rhubarb','pie',debug=True)
self.assertTrue(a.foo=='rhubarb')
self.assertTrue(a.path=='pie')
self.assertTrue(a.debug==True)
if __name__ == '__main__':
unittest.main(argv = sys.argv + ['--verbose'])
PS。使用autoassign
或autoargs
与IPython代码完成兼容。