... Python list comprehensions are not perfect and are useful only for the most common cases.
I'm sure that Guido weeps himself to sleep every night knowing that this feature is only useful for 90% of use cases and not 100%
Sure they're not perfect, but as you say they work for most cases and when they don't they're easy to replace with your customised solution - perfect is the enemy of better, and list comprehensions definitely make Python "better"
Use a generator function for mid instead, then values will only be pulled out one-by-one as needed.
True, but you can generally get by with learning one way while learning, then expand options later. For a lot of Python IMO the complexity is very well-hidden from a beginner, and little things like the help() and dir() functions make life easier.
Couldn't live without IPython now though, I've been totally spoilt by auto-call, ? and ??, the history tools, the ed command, etc etc....
After three days of watching them argue I finally resolved the issue by dropping a few convenience methods and replacing the class with a NamedTuple.
Ah, the namedtuple, love that type, makes small property bags simple and efficient, and yet you still go nuts and sub-class it if you really have to
*checks*
Looking at my user-site directory, apparently write my own Properties class - actually, three different classes for some reason, all slightly different and way more complicated than the namedtuple
My only niggle is the declaration syntax with the redundant type name
Point = namedtuple("Point", "x y")
which just looks ripe for danger lol.
I think I know what you mean - once you get "under the hood" there really are ways to customise everything. Metaclasses, abstract base classes, descriptors, descriptors, context managers, types, properties... all on top of plain-old multiple inheritance
All that stuff came way later though, for going from zero to code Python is pretty simple - you don't need all that stuff for 98% of use cases.
That is something that would be a nifty construct. About the closest I can think of off the top of my head is using a nested generator expression
borbs = [b for b in (compute(orn) for orn in orns) if b > 12]
Which isn't too awkward IMO, it's pretty clear there's two stages: a map and then a filter, and it's more readable than e.g.
borbs = list(filter(lambda b: b > 12, map(compute, orns)))
It depends
If compute() is a "heavy" function, then the plain loop is the best, although I'd probably use the
borbs = [b for b in map(compute, orns) if b > 12]
construction LoneTech posted earlier.
If it's a small function in a throwaway script then probably just
borbs = [compute(orn) for orn in orns if compute(orn) > 12]
as you posted.
How about something like
from itertools import dropwhile
def compute(l):
for i in l:
yield i * 2borbs = list(dropwhile(lambda b: b <= 12, compute(orns)))
All of what you stated is convention, documentation and community-agreed definition of Pythonic.
My point was that it's not just the community of people using Python, but that it's also part of the community of people who design Python, and has been from the start. The latter feeds into the former, and then vice versa, and without both sides you end up with at best where JavaScript is today - intense focus on making code better, but every single avenue has multiple options and you end up with a bewildering array of choices.
It's both. Type import this from the interpreter, and you'll get this:
The Zen of Python, by Tim Peters
Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
While it doesn't always manage it, if you read the discussions and PEPs relating to the language's design it's clear that the idea of a "Pythonic" way of doing things is one of the top considerations.
How do you feel about ethics in game journalism?
Oooh, I know this one. It's about Cultural Marxism, amirite?
Sure it won't be quite the unanimity it was before, but the few dissenters won't prevent it from being renewed again. Only one Republican voted for this bill, most of them were loudly against weakening the PATRIOT Act in any way; come renewal time they'll extend it for another five years happily.
Why would you assume that it will go any differently in 2015 than it did in 2005, 2006 and 2011? The Republicans came out against this bill with accusations that it would help ISIS and risk another 9/11, and when the time for renewal is up in May (not January as I said), they will be in control of both houses and looking towards the primaries and the election after that - they're not going to let it expire
I don't see any chance that it won't be renewed. I'm sure there will be lots of drama, name-calling and stirring speeches, but in the end, little or no substantive changes to the act itself, and it will be 2020 before all this comes up again.
It extended 3 out of 100 provisions of the PATRIOT Act until 2017. And actually, the vote was to put it up for discussion and amendment, so it could have been possible to get rid of that.
Now the entire act will be renewed in January, all 100 provisions. Not a win.
But it's easier to parse HTML5 than it was any previous version of HTML, as there is now an actual specification which details the process exactly rather than relying on each browser's interpretation. It can't be that difficult given the number of working parsers and validators out there for HTML5.
Plus, HTML5 can already be written using XML syntax, aka XHTML5. And searching for xhtml5.xsd or xhtml5.rng gave me plenty of links to schemas for validating XML-syntax HTML5.
If you need to store validated documents, then you shouldn't be storing them in HTML format! Store them as XML documents with well-defined schemas (Relax NG of course!), and then use XSLT or possibly XQuery to turn them into HTML fragments for display.
For God's sake, stop researching for a while and begin to think!
