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I've used generators, but never really used coroutines introduced by PEP Despite some similarities, generators and coroutines are basically two different concepts. Understanding coroutines not only generators is the key to understanding the new syntax. IMHO coroutines are the most obscure Python feature , most books make it look useless and uninteresting. Thanks for the great answers, but special thanks to agf and his comment linking to David Beazley presentations.
David rocks. Let's get one thing out of the way first. The explanation that yield from g is equivalent to for v in g: yield v does not even begin to do justice to what yield from is all about. Because, let's face it, if all yield from does is expand the for loop, then it does not warrant adding yield from to the language and preclude a whole bunch of new features from being implemented in Python 2. What yield from does is it establishes a transparent bidirectional connection between the caller and the sub-generator :.
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- Sending data to a generator (coroutine) using yield from - Part 1;
The connection is "transparent" in the sense that it will propagate everything correctly too, not just the elements being generated e. The connection is "bidirectional" in the sense that data can be both sent from and to a generator. If we were talking about TCP, yield from g might mean "now temporarily disconnect my client's socket and reconnect it to this other server socket". BTW, if you are not sure what sending data to a generator even means, you need to drop everything and read about coroutines first—they're very useful contrast them with subroutines , but unfortunately lesser-known in Python.
Dave Beazley's Curious Course on Couroutines is an excellent start. Read slides for a quick primer. Instead of manually iterating over reader , we can just yield from it. That works, and we eliminated one line of code. And probably the intent is a little bit clearer or not. But nothing life changing. Now let's do something more interesting. Let's create a coroutine called writer that accepts data sent to it and writes to a socket, fd, etc.
Now the question is, how should the wrapper function handle sending data to the writer, so that any data that is sent to the wrapper is transparently sent to the writer? The wrapper needs to accept the data that is sent to it obviously and should also handle the StopIteration when the for loop is exhausted. Evidently just doing for x in coro: yield x won't do.
Here is a version that works. Let's make it more complicated. What if our writer needs to handle exceptions? Let's make it work, but manually handling exceptions and sending them or throwing them into the sub-generator writer. The yield from transparently handles sending the values or throwing values into the sub-generator.
This still does not cover all the corner cases though. What happens if the outer generator is closed? What about the case when the sub-generator returns a value yes, in Python 3. That yield from transparently handles all the corner cases is really impressive. I personally feel yield from is a poor keyword choice because it does not make the two-way nature apparent. There were other keywords proposed like delegate but were rejected because adding a new keyword to the language is much more difficult than combining existing ones.
In summary, it's best to think of yield from as a transparent two way channel between the caller and the sub-generator.
As the PEP describes, this is a rather naive attempt at using the subgenerator, it's missing several aspects, especially the proper handling of the. To do this properly, rather complicated code is necessary. Consider that you want to extract information from a recursive data structure. Let's say we want to get all leaf nodes in a tree:. Even more important is the fact that until the yield from , there was no simple method of refactoring the generator code.
Suppose you have a senseless generator like this:. Now you decide to factor out these loops into separate generators. Without yield from , this is ugly, up to the point where you will think twice whether you actually want to do it. With yield from , it's actually nice to look at:. I think what this section in the PEP is talking about is that every generator does have its own isolated execution context. The effect of this is also comparable: Both the generator-iterator and the caller progress in their execution state at the same time, their executions are interleaved.
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Last year I pointed to the period between March and May as a good period for the stock market.
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But there is only so far that you can blow the balloon up. When it rose again to above 14, in mid-October, another correction by late November saw another 1, points wiped off the board. Oil prices have been gradually going up, and despite record market peaks, most of the US population are living in substantial debt, with not a great deal of liquidity. A time of unprecedented market growth is coming to an end, although the full ramifications of that may not be evident until after the Presidential election in November.
However the opposite applies when the North Node is in Leo. It was in Leo from October until April of During this time the index jumped phenomenally from 8, to almost 12, points.
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The Node entered Aquarius on December 19 , and will remain there until August By the end of October both Saturn and Uranus will begin an opposition phase that continues until August This same planetary opposition was coincident with the New York Stock Market collapse and closure for ten days, triggering a severe nationwide economic depression. Unregulated speculative credit was a root cause then, as it appears to be now.
This period is known as the Long Depression. While the latter period of will bring the greatest difficulty this year, we are witnessing the beginning of a downward trend. And for that reason it could be more of a slow motion derailment to begin with. However by the end of , and especially mid when Jupiter, Saturn, Uranus and Pluto all come within hard aspect to each other we may witness the very serious ramifications of blowing up the economy balloon too far and too fast.
The volatile times to watch this year may be around March 7, July , the first week of November and second one of December. Right at the end of , in the final degrees of Sagittarius there was an important conjunction between union of Jupiter and Pluto. Most unusually it fell on the same spot in the heavens that an identical union of Saturn and Uranus occupied throughout Whenever you get a trigger point reactivated like that you have to take a step back in time and compare what was happening then, which can often give you a key to the next unfolding chapter.
Let me qualify that by saying that these things don't HAVE to happen, but they provide an adequate framework of potential to judge what might. For example it was in on December 2 that Benazir Bhutto was sworn in as the first female Prime Minister of Pakistan. As the Jupiter Pluto often signifying international terrorism returned to this position in December her life was taken. Roberts struck an Iranian mine in the Persian Gulf. It was also the first surface-to-surface missile engagement in U.
Navy history. Iran lost two warships and three armed speedboats. Things cooled off after that until July 03 when the USS Vincennes took an Iranian commercial flight Airbus AB2 out of the skies over the Strait of Hormuz, The incident occasioned the loss of civilian lives, 66 of whom were children. Leter in the year, on December 21, a Pan Am jet was blown out of the skies over Lockerbie, Scotland, killing a total of people.
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Many analysts saw this as a square up from either Iran or Libya. As Saturn and Uranus move to opposition by late October the match may well be lit for eventual confrontation between the US and Iran, or a significant Middle East naval or military operation. Perhaps the triple play of Mars into Cancer from March 4 may signify something, but it is the later year opposition that marks the real danger period. Bush also has progressed Mars coming to Jupiter in the same time period which makes October onward look seem the more volatile time window. As expected the Bush administration horoscope originally January 20 As Pluto moves into Capricorn it will also move to square the fixed star of Scheat renowned for marine disasters.
There is plenty to signify war at sea, or terrorism involving travel — especially later in the year. Uranus is the planet of flight, and its opposition to Saturn may heighten international air incidents as it did here in Not all were intentional either. In January the Dow tumbled Around early March would be one time to watch, along with the last couple of days of that month. The 7th of July and surrounding dates, the same between the 3rd to 8th of September. Other times are the US election week and most of December also looks pretty volatile.
Rather than see this as leader replacing leader I see this more as an issue of mainland China and Taiwan reuniting, although this issue probably applies more to But the winds of change are blowing. Lastly on November 15 the independent State of Palestine was proclaimed by a vote of to 46 in Algiers. Negotiations this year hope to make that proclamation a reality. How serious the international community really are will be determined by the outcome.