本文實例講述了Python裝飾器用法。分享給大家供大家參考，具體如下：
用類作為裝飾器
示例一
最初代碼：
class bol(object): def __init__(self, func): self.func = func def __call__(self): return "<b>{}</b>".format(self.func())class ita(object): def __init__(self, func): self.func = func def __call__(self): return "<i>{}</i>".format(self.func())@bol@itadef sayhi(): return 'hi'改進一：
class sty(object): def __init__(self, tag): self.tag = tag def __call__(self, f): def wraper(): return "<{tag}>{res}</{tag}>".format(res=f(), tag=self.tag) return wraper@sty('b')@sty('i')def sayhi(): return 'hi'改進二：
class sty(object): def __init__(self, *tags): self.tags = tags def __call__(self, f): def wraper(): n = len(self.tags) return "{0}{1}{2}".format(('<{}>'*n).format(*self.tags), f(), ('</{}>'*n).format(*reversed(self.tags))) return wraper@sty('b', 'i')def sayhi(): return 'hi'print(sayhi())改進三：
class sty(object): def __init__(self, *tags): self.tags = tags def __call__(self, f): def wraper(*args, **kwargs): n = len(self.tags) return "{0}{1}{2}".format(('<{}>'*n).format(*self.tags), f(*args, **kwargs), ('</{}>'*n).format(*reversed(self.tags))) return wraper@sty('b', 'i')def say(word='Hi'): return wordprint(say())print(say('Hello'))示例二
最初代碼：
import threadingimport timeclass DecoratorClass(object): def __init__(self): self.thread = None def __call__(self, func, *args, **kwargs): def wrapped_func(*args, **kwargs): curr_thread = threading.currentThread().getName() self.thread = curr_thread print('/nthread name before running func:', self.thread) ret_val = func() print('/nthread name after running func:', self.thread) return ret_val return wrapped_func@DecoratorClass()def decorated_with_class(): print('running decorated w class') time.sleep(1) returnthreads = []for i in range(5): t = threading.Thread(target=decorated_with_class) threads.append(t) t.setDaemon(True) # 守護 t.start()改進：進程鎖
import threadingimport timeclass DecoratorClass(object): def __init__(self): self.thread = None self.lock = threading.Lock() def __call__(self, func, *args, **kwargs): def wrapped_func(*args, **kwargs): self.lock.acquire() curr_thread = threading.currentThread().getName() self.thread = curr_thread print('thread name before running func:', self.thread) ret_val = func() print('/nthread name after running func:', self.thread) self.lock.release() return ret_val return wrapped_func@DecoratorClass()def decorated_with_class(): print('Let me sleep 1 second...') time.sleep(1) returnthreads = []for i in range(5): t = threading.Thread(target=decorated_with_class) threads.append(t) t.start()更多關于Python相關內容可查看本站專題：《Python數據結構與算法教程》、《Python Socket編程技巧總結》、《Python函數使用技巧總結》、《Python字符串操作技巧匯總》及《Python入門與進階經典教程》
希望本文所述對大家Python程序設計有所幫助。
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