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              Python協程深入理解 | Python基礎教程

              從語法上來看,協程和生成器類似,都是定義體中包含yield關鍵字的函數。

              yield在協程中的用法:

              • 在協程中yield通常出現在表達式的右邊?,例如:datum = yield,可以產出值,也可以不產出–如果yield關鍵字后面沒有表達式,那么生成器產出None.
              • 協程可能從調用方接受數據,調用方是通過send(datum)的方式把數據提供給協程使用,而不是next(…)函數,通常調用方會把值推送給協程。
              • 協程可以把控制器讓給中心調度程序,從而激活其他的協程

              所以總體上在協程中把yield看做是控制流程的方式。

              了解協程的過程

              先通過一個簡單的協程的例子理解:

              Python協程深入理解 | Python基礎教程

              對上述例子的分析:

              yield 的右邊沒有表達式,所以這里默認產出的值是None

              剛開始先調用了next(…)是因為這個時候生成器還沒有啟動,沒有停在yield那里,這個時候也是無法通過send發送數據。所以當我們通過?next(…)激活協程后?,程序就會運行到x = yield,這里有個問題我們需要注意,?x = yield這個表達式的計算過程是先計算等號右邊的內容,然后在進行賦值,所以當激活生成器后,程序會停在yield這里,但并沒有給x賦值。

              當我們調用send方法后yield會收到這個值并賦值給x,而當程序運行到協程定義體的末尾時和用生成器的時候一樣會拋出StopIteration異常

              如果協程沒有通過next(…)激活(同樣我們可以通過send(None)的方式激活),但是我們直接send,會提示如下錯誤:

              Python協程深入理解 | Python基礎教程

              關于調用next(…)函數這一步通常稱為”預激(prime)“協程,即讓協程向前執行到第一個yield表達式,準備好作為活躍的協程使用

              協程在運行過程中有四個狀態:

              1. GEN_CREATE:等待開始執行
              2. GEN_RUNNING:解釋器正在執行,這個狀態一般看不到
              3. GEN_SUSPENDED:在yield表達式處暫停
              4. GEN_CLOSED:執行結束

              通過下面例子來查看協程的狀態:

              Python協程深入理解 | Python基礎教程

              接著再通過一個計算平均值的例子來繼續理解:

              Python協程深入理解 | Python基礎教程

              這里是一個死循環,只要不停send值給協程,可以一直計算下去。

              通過上面的幾個例子我們發現,我們如果想要開始使用協程的時候必須通過next(…)方式激活協程,如果不預激,這個協程就無法使用,如果哪天在代碼中遺忘了那么就出問題了,所以有一種預激協程的裝飾器,可以幫助我們干這件事

              預激協程的裝飾器

              下面是預激裝飾器的演示例子:

              復制代碼
               1 from functools import wraps
               2 
               3 
               4 def coroutine(func):
               5     @wraps(func)
               6     def primer(*args,**kwargs):
               7         gen = func(*args,**kwargs)
               8         next(gen)
               9         return gen
              10     return primer
              11 
              12 
              13 @coroutine
              14 def averager():
              15     total = 0.0
              16     count = 0
              17     average = None
              18     while True:
              19         term = yield average
              20         total += term
              21         count += 1
              22         average = total/count
              23 
              24 
              25 coro_avg = averager()
              26 from inspect import getgeneratorstate
              27 print(getgeneratorstate(coro_avg))
              28 print(coro_avg.send(10))
              29 print(coro_avg.send(30))
              30 print(coro_avg.send(5))
              復制代碼

              關于預激,在使用yield from句法調用協程的時候,會自動預激活,這樣其實與我們上面定義的coroutine裝飾器是不兼容的,在python3.4里面的asyncio.coroutine裝飾器不會預激協程,因此兼容yield from

              終止協程和異常處理

              協程中為處理的異常會向上冒泡,傳給next函數或send函數的調用方(即觸發協程的對象)

              拿上面的代碼舉例子,如果我們發送了一個字符串而不是一個整數的時候就會報錯,并且這個時候協程是被終止了

              Python協程深入理解 | Python基礎教程

              從python2.5開始客戶端代碼在生成器對象上調用兩個方法,顯示的把異常發送給協程

              分別為:?throw和close

              generator.throw:會讓生成器在暫停的yield表達式處拋出指定的異常,如果生成器處理了拋出的異常,代碼會向前執行到下一個yield表達式,而產出的值會成為調用generator.throw方法代碼的返回值。如果生成器沒有處理拋出的異常,異常會向上冒泡,傳到調用方的上下文中。

              generator.close:會讓生成器在暫停的yield表達式處拋出GeneratorExit異常。如果生成器沒有處理這個異常,或者拋出了StopIteration異常,調用方不會報錯,如果收到GeneratorExit異常,生成器一定不能產出值,否則解釋器會拋出RuntimeError異常。生成器拋出的異常會向上冒泡,傳給調用方。

              下面是一個例子:

              Python協程深入理解 | Python基礎教程

              當傳入我們定義的異常時不會影響協程,協程不會停止,可以繼續send,但是如果是沒有處理的異常的時候,就會報錯,并且協程會被終止

              讓協程返回值

              通過下面的例子進行演示如何獲取協程的返回值:

              復制代碼
               1 from collections import namedtuple
               2 
               3 
               4 Result = namedtuple("Result","colunt average")
               5 
               6 
               7 def averager():
               8     total = 0.0
               9     count = 0
              10     average = None
              11     while True:
              12         term = yield
              13         if term is None:
              14             break
              15         total += term
              16         count+=1
              17         average = total/count
              18     return Result(count,average)
              19 
              20 coro_avg = averager()
              21 next(coro_avg)
              22 coro_avg.send(10)
              23 coro_avg.send(30)
              24 coro_avg.send(5)
              25 try:
              26     coro_avg.send(None)
              27 except StopIteration as e:
              28     result = e.value
              29     print(result)
              復制代碼

              這樣就可以獲取到最后的結果:

              Python協程深入理解 | Python基礎教程

              其實相對來說上面這種方式獲取返回值比較麻煩,而yield from 結構會自動捕獲StopIteration異常,這種處理方式與for循環處理StopIteration異常的方式一樣,循環機制使我們更容易理解處理異常,對于yield from來說,解釋器不僅會捕獲StopIteration異常,還會把value屬性的值變成yield from表達式的值

              關于yield from

              在生成器gen中使用yield from subgen()時,subgen會獲得控制權,把產出的值傳給gen的調用方,即調用方可以直接控制subgen,同時,gen會阻塞,等待subgen終止

              yield from x表達式對x對象所做的第一件事是,調用iter(x),從中獲取迭代器,因此x可以是任何可迭代的對象

              下面是yield from可以簡化yield表達式的例子:

              復制代碼
               1 def gen():
               2     for c in "AB":
               3         yield c
               4     for i in range(1,3):
               5         yield i
               6 
               7 print(list(gen()))
               8 
               9 def gen2():
              10     yield from "AB"
              11     yield from range(1,3)
              12 
              13 print(list(gen2()))
              復制代碼

              這兩種的方式的結果是一樣的,但是這樣看來yield from更加簡潔,但是yield from的作用可不僅僅是替代產出值的嵌套for循環。

              yield from的主要功能是打開雙向通道,把最外層的調用方與最內層的子生成器連接起來,這樣二者可以直接發送和產出值,還可以直接傳入異常,而不用再像之前那樣在位于中間的協程中添加大量處理異常的代碼

              通過yield from還可以鏈接可迭代對象

              Python協程深入理解 | Python基礎教程

              委派生成器在yield from 表達式處暫停時,調用方可以直接把數據發給子生成器,子生成器再把產出產出值發給調用方,子生成器返回之后,解釋器會拋出StopIteration異常,并把返回值附加到異常對象上,此時委派生成器會恢復。

              下面是一個完整的例子代碼

              復制代碼
               1 from collections import namedtuple
               2 
               3 
               4 Result = namedtuple('Result', 'count average')
               5 
               6 
               7 # 子生成器
               8 def averager():
               9     total = 0.0
              10     count = 0
              11     average = None
              12     while True:
              13         term = yield
              14         if term is None:
              15             break
              16         total += term
              17         count += 1
              18         average = total/count
              19     return Result(count, average)
              20 
              21 
              22 # 委派生成器
              23 def grouper(result, key):
              24     while True:
              25         result[key] = yield from averager()
              26 
              27 
              28 # 客戶端代碼,即調用方
              29 def main(data):
              30     results = {}
              31     for key,values in data.items():
              32         group = grouper(results,key)
              33         next(group)
              34         for value in values:
              35             group.send(value)
              36         group.send(None) #這里表示要終止了
              37 
              38     report(results)
              39 
              40 
              41 # 輸出報告
              42 def report(results):
              43     for key, result in sorted(results.items()):
              44         group, unit = key.split(';')
              45         print('{:2} {:5} averaging {:.2f}{}'.format(
              46             result.count, group, result.average, unit
              47         ))
              48 
              49 data = {
              50     'girls;kg':
              51         [40.9, 38.5, 44.3, 42.2, 45.2, 41.7, 44.5, 38.0, 40.6, 44.5],
              52     'girls;m':
              53         [1.6, 1.51, 1.4, 1.3, 1.41, 1.39, 1.33, 1.46, 1.45, 1.43],
              54     'boys;kg':
              55         [39.0, 40.8, 43.2, 40.8, 43.1, 38.6, 41.4, 40.6, 36.3],
              56     'boys;m':
              57         [1.38, 1.5, 1.32, 1.25, 1.37, 1.48, 1.25, 1.49, 1.46],
              58 }
              59 
              60 
              61 if __name__ == '__main__':
              62     main(data)
              復制代碼

              關于上述代碼著重解釋一下關于委派生成器部分,這里的循環每次迭代時會新建一個averager實例,每個實例都是作為協程使用的生成器對象。

              grouper發送的每個值都會經由yield from處理,通過管道傳給averager實例。grouper會在yield from表達式處暫停,等待averager實例處理客戶端發來的值。averager實例運行完畢后,返回的值會綁定到results[key]上,while 循環會不斷創建averager實例,處理更多的值

              并且上述代碼中的子生成器可以使用return 返回一個值,而返回的值會成為yield from表達式的值。

              關于yield from的意義

              關于yield from 六點重要的說明:

              1. 子生成器產出的值都直接傳給委派生成器的調用方(即客戶端代碼)
              2. 使用send()方法發送給委派生成器的值都直接傳給子生成器。如果發送的值為None,那么會給委派調用子生成器的__next__()方法。如果發送的值不是None,那么會調用子生成器的send方法,如果調用的方法拋出StopIteration異常,那么委派生成器恢復運行,任何其他異常都會向上冒泡,傳給委派生成器
              3. 生成器退出時,生成器(或子生成器)中的return expr表達式會出發StopIteration(expr)異常拋出
              4. yield from表達式的值是子生成器終止時傳給StopIteration異常的第一個參數。yield from 結構的另外兩個特性與異常和終止有關。
              5. 傳入委派生成器的異常,除了GeneratorExit之外都傳給子生成器的throw()方法。如果調用throw()方法時拋出StopIteration異常,委派生成器恢復運行。StopIteration之外的異常會向上冒泡,傳給委派生成器
              6. 如果把GeneratorExit異常傳入委派生成器,或者在委派生成器上調用close()方法,那么在子生成器上調用clsoe()方法,如果它有的話。如果調用close()方法導致異常拋出,那么異常會向上冒泡,傳給委派生成器,否則委派生成器拋出GeneratorExit異常

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