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Python Decorator的一些细节 - 雪地
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<h1>Python Decorator的一些细节</h1>
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<span class="date">2016/3/31 19:14 下午</span>
<span>posted in </span>
<span class="posted-in"><a href='Python.html'>Python</a></span>
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<p>装饰器函数并不是在被修饰函数调用的时候才执行，而是修饰语句所在的代码块被执行的时候执行。</p>
<p>而且当一个文件（模块）被import的时候，文件内的<strong>所有</strong>装饰器就会被激活执行。因为装饰器语句相当于文件中的普通语句，而非函数声明或者类声明的一部分。</p>
<p>用以下代码方便理解：</p>
<pre><code># sample.py
def decorator_function(func):
print "executing the decorator."
def wrapper(*args, **kwargs):
print "decorated function is executing."
return func(*args, **kwargs)
return wrapper
print "this python file is executing."
@decorator_function
def test_function(sth):
print "blablabla"+sth
test_function("yeah")
</code></pre>
<p>而当我们对一个类里面的普通函数使用修饰符进行修饰的时候，然后我们正常调用这一函数（通过实例化的对象调用），会报错提示这一函数变成了unbound method，缺少了类中函数默认的首参数self。这一问题是由于经过装饰器修饰的函数，实际上是被传递到了装饰器函数中，在这个装饰器函数中被独立调用的，而非被其原先所在的类对象调用。因此在这个装饰器函数中，没有其原来所在的类来对它进行调用，导致提示unbound method.</p>
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