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Coroutines and yield Expressions
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def coroutine(func): def start(*args,**kwargs): g = func(*args,**kwargs) gnext() return g return start
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Using this decorator, you would write and use coroutines using:
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@coroutine def receiver(): print("Ready to receive") while True: n = (yield) print("Got %s" % n) # Example use r = receiver() rsend("Hello World") # Note : No initial next() needed
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A coroutine will typically run indefinitely unless it is explicitly shut down or it exits on its ownTo close the stream of input values, use the close() method like this:
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>>> rclose() >>> rsend(4) Traceback (most recent call last): File "<stdin>", line 1, in <module> StopIteration
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Once closed, a StopIteration exception will be raised if further values are sent to a coroutineThe close() operation raises GeneratorExit inside the coroutine as described in the previous section on generators For example:
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def receiver(): print("Ready to receive") try: while True: n = (yield) print("Got %s" % n) except GeneratorExit: print("Receiver done")
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Exceptions can be raised inside a coroutine using the throw(exctype [, value [, tb]]) method where exctype is an exception type, value is the exception value, and tb is a traceback object For example:
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>>> rthrow(RuntimeError,"You're hosed!") Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 4, in receiver RuntimeError: You're hosed!
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Exceptions raised in this manner will originate at the currently executing yield statement in the coroutine A coroutine can elect to catch exceptions and handle them as appropriate It is not safe to use throw() as an asynchronous signal to a coroutine it should never be invoked from a separate execution thread or in a signal handler A coroutine may simultaneously receive and emit return values using yield if values are supplied in the yield expression Here is an example that illustrates this:
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def line_splitter(delimiter=None): print("Ready to split") result = None while True: line = (yield result) result = linesplit(delimiter)
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In this case, we use the coroutine in the same way as before However, now calls to send() also produce a result For example:
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>>> s = line_splitter(",") >>> snext() Ready to split >>> ssend("A,B,C") ['A', 'B', 'C' ] >>> ssend("100,200,300") ['100', '200', '300'] >>>
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Understanding the sequencing of this example is criticalThe first next() call advances the coroutine to (yield result), which returns None, the initial value of result On subsequent send() calls, the received value is placed in line and split into resultThe value returned by send() is the value passed to the next yield statement encountered In other words, the value returned by send() comes from the next yield expression, not the one responsible for receiving the value passed by send() If a coroutine returns values, some care is required if exceptions raised with throw() are being handled If you raise an exception in a coroutine using throw(), the value passed to the next yield in the coroutine will be returned as the result of throw() If you need this value and forget to save it, it will be lost
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At first glance, it might not be obvious how to use generators and coroutines for practical problems However, generators and coroutines can be particularly effective when applied to certain kinds of programming problems in systems, networking, and distributed computation For example, generator functions are useful if you want to set up a processing pipeline, similar in nature to using a pipe in the UNIX shell One example of this appeared in the Introduction Here is another example involving a set of generator functions related to finding, opening, reading, and processing files:
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import os import fnmatch def find_files(topdir, pattern): for path, dirname, filelist in oswalk(topdir): for name in filelist: if fnmatchfnmatch(name, pattern): yield ospathjoin(path,name) import gzip, bz2 def opener(filenames): for name in filenames: if nameendswith("gz"): f = gzipopen(name) elif nameendswith("bz2"): f = bz2BZ2File(name) else: f = open(name) yield f def cat(filelist): for f in filelist: for line in f: yield line def grep(pattern, lines): for line in lines: if pattern in line: yield line