为了避免出现明显的弊端,我想防止使用某些职能的立场论点。 是否有办法实现这一目标?
Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...
为了避免出现明显的弊端,我想防止使用某些职能的立场论点。 是否有办法实现这一目标?
只有Adhur 3 能够适当做到这一点(而且你使用了Python3 标签,因此可以罚款):
def function(*, x, y, z):
print(x,y,z)
使用<代码>**kwargs,除非你稍后核对,否则将允许用户输入any 论点。 此外,它将掩盖真实的论据,以逃避猜测。
<代码>**kwargs不是这个问题的答案。
测试方案:
>>> function(1,2,3)
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
function(1,2,3)
TypeError: function() takes exactly 0 positional arguments (3 given)
>>> function(x=1, y=2, z=3)
1 2 3
您可以界定一个分母,即如果它的职能是用任何立场论点加以纠正,则使用内观来造成错误。 这使你能够阻止具有某些职能的use立场论点,同时允许你按照你的意愿担任这些职务。
例如:
def kwargs_only(f):
def new_f(**kwargs):
return f(**kwargs)
return new_f
使用:
@kwargs_only
def abc(a, b, c): return a + b + c
因此(类型错误):
abc(1,2,3)
因此,你可以使用:
abc(a=1,b=2,c=3)
更强有力的解决办法是使用<代码>decorator模块。
是的,只是使用<代码>**kwargs,而只读到其中的参数。
def my_function(**kwargs):
for key, value in kwargs.iteritems():
print ("%s = %s" % (key, value))
my_function(a="test", b="string")
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