Since generator returns values lazily, how do I determine if the value returned from a generator is one-but-last? I spent like an hour on this and can't figure it out. Any help appreciated. Is it even possible?? Thanks, Boda Cydo! ...
I can't figure out how to look ahead one element in a Python generator. As soon as I look it's gone. Here is what I mean: gen = iter([1,2,3]) next_value = gen.next() # okay, I looked forward and see that next_value = 1 # but now: list(gen) # is [2, 3] -- the first value is gone! Here is a more real example: gen = element_generato...
I have a generator (numbers) and a value (number). I would like to iterate over these as if they were one sequence: i for i in tuple(my_generator) + (my_value,) The problem is, as far as I undestand, this creates 3 tuples only to immediately discard them and also copies items in "my_generator" once. Better approch would be: def con(...
I made a mistake early in development, and named one of my models with plural noun (Users instead of User). Is there an easy way to rename it and corresponding controller (similar to generating it with script/generate way)? ...
I have a file system containing directories of "builds", each of which contains a file called "build-info.xml". However some of the builds happened before the build script generated "build-info.xml" so in that case I have a somewhat non-trivial SCons SConstruct that is used to generate a skeleton build-info.xml so that it can be used as ...
Suppose I have a list that I wish not to return but to yield values from. What is the most Pythonic way to do that? Here is what I mean. Thanks to some non-lazy computation I have computed the list ['a', 'b', 'c', 'd'], but my code through the project uses lazy computation, so I'd like to yield values from my function instead of returni...
I want to use a custom sequence generator in my application, but the entity is located in a domain model jar that is shared with other applications. Apparently entity annotations can be overridden in orm.xml but I can't figure out the proper XML incantation to get this to work. I can modify the annotation in the entity like this this: ...
I have studied generators feature and i think i got it but i would like to understand where i could apply it in my code. I have in mind the following example i read in "Python essential reference" book: # tail -f def tail(f): f.seek(0,2) while True: line = f.readline() if not line: time.sleep(0.1) continue yi...
I'd like to generate an array of Random numbers with defined Min, Max, Mean and Stdev with given number of elements and error level. Is there such a library in C, C++, PHP or Python to do so? Please kindly advise. Thanks! ...
Hi There. Is there a way that I can produce a report in RoR without using Ruport or any other report generator rails plugin? Thanks in advance ...
I need a simple parser generator. The language does not matter. It only has to be easy and well documented. ...
Consider a tuple v = (a,b,c) and a generator function generate(x) which receives an item from the tuple and generates several options for each item. What is the pythonic way of generating a set of all the possible combinations of the result of generate(x) on each item in the tuple? I could do this: v = (a,b,c) for d in generate(v[0]):...
I want to define a generator from a list that will output the elements one at a time, then use this generator object in an appropriate manner. a = ["Hello", "world", "!"] b = (x for x in a) c = next(b, None) while c != None: print c, c = next(b, None) Is there anything wrong or improvable with the while approach here? Is ther...
Is there any class generator for bltoolkit? ...
Is there a Class Map generator for Fluent NHibernate? I need something like db2hbm but I want it to generate Fluent Class Maps instead of xml mappings. I am aware of AutoMapping for Fluent but that is not what I want. I want to be able to generate Class Map files from tables in database and push them to my src repository. ...
I was wondering if there was a software that would generate UML class diagrams from my project files (C#) in Visual Studio 2008 Professional? Like a plugin of sorts? Thanks in advance. p.s. I have checked previous posts and did not see anything useful on the first glance. EDIT: I found Class Diagram item! but open to more tips. EDIT:...
Hi, I was puzzled with one of the question in Microsoft interview which is as given below: A function should accept a range( 3 - 21 ) and it should print all the consecutive numbers combinations to form each number as given below: 3 = 1+2 5 = 2+3 6 = 1+2+3 7 = 3+4 9 = 4+5 10 = 1+2+3+4 11 = 5+6 12 = 3+4+5 13 = 6+7 14 = 2+3+4+5 15...
How to shuffle the elements in the pairs? The program below, generate all possible pairs and later shuffle the pairs. e.g. possible pairs before shuffle is ab,ac,ae,af..etc shuffled to ac,ae,af,ab...etc How to make it not only shuffled in pairs but within the elements in the pair itself? e.g. instead of ab, ac, how can I make ba, ac ? ...
I've got a bit of fettish for language design and I'm currently playing around with my own hobby language. (http://rogeralsing.com/2010/04/14/playing-with-plastic/) One thing that really makes my mind bleed is "generators" and the "yield" keyword. I know C# uses AST transformation to transform enumerator methods into statemachines. But...
I want to check the central limit with dices. Roll D dices. Sum the results. Repeat the same thing for N times. Change D and repeat. There's no need to store random values so I want to use only generators. The problem is that the generators are consumed; I can't reuse them many times. Now my code uses explicit for and I don't like it. ...