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Original question: Can someone tell me how to use "slice lists" and the "ellipsis"? When are they useful? Thanks.
Here's what the language definition says about "slice_list" and "ellipsis"; Alex Martelli's answer points out their origin, which is not ...
Started by behindthefall on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Here goes list slicing:
I hope you know that list....
Slice lists and ellipsis were originally introduced not too sure about ellipsis, so I will not address that, lest I give you a bad answer.
Numpy uses them to implement array slicing.
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I'm trying to find a neat way of summing a list and a list of lists in the same function, so far I've got:
import operator """ Fails late for item = ['a', 'b'] """ def validate(item): try: return sum(item) == sum(range(1, 10)) except TypeError: return...
Started by MattyW on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Perhaps you'd find it easier to flatten the list first?
def flatten(xs): for x in xs: try: sub this:
In [4]: fs = flatten([1,2,[3,4,[5,6],7],8,[9,10]]) In [5]: list(fs) Out[5]: [1, 2, 3, 4, 5, 6, 7 that it doesn't work on mixed lists....
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This is a great primer but doesn't answer what I need: http://stackoverflow.com/questions/464342/combining-two-sorted-lists-in-python
I have two Python lists, each is a list of datetime,value pairs:
list_a = [['1241000884000', 3], ['1241004212000', 4]...
Started by Adam Nelson on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
Merged= list( merge_lists( someDict['object_a'], someDict['object_b'] )
This may be slightlyHere's some code....
Has each datetime from list_x and value_a/value_x."
def merge_lists( list_a, list_x ): dict_x= dict.
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Ask your Facebook Friends
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Hi,
I have a list of two-item lists and need to search for things in it.
If the list is:
list =[ ['a','b'], ['a','c'], ['b','d'] ]
I can search for a pair easily by doing
['a','b'] in list
Now, is there a way to see if I have a pair in which a string ...
Started by joaoc on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
The asterisk takes the contents of the_list'] .)
>>>....
Gt; "b" in zip(*the_list)[1] True
zip() takes a bunch of lists and groups elements together by index, effectively transposing the list-of-lists matrix.
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Hi,
I'm trying to use scheme to write a function f that takes a number n and a function g and returns a list of lists of length n , but according with booleans according to the pattern indicated by g . For example, the function f should take n say 3 and...
Started by Elizabeth on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
(eg list lKey to this looks like....
Solution, I'd first construct your list of lists (just use an accumulator -- count down -- to make (probably twice, depending on how you implement your solution) to the list of lists.
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I've created a custom list & also added a column in the Announcement List. Question is, how can I include those newly created items when I create a fresh Web Application (like a script, feature or something)?
Additional Info : It's like when you're to...
Started by Leon Tayson on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Regarding the new custom....
The custom list automatically created for existing webs or to modify existing lists similar in the context of list templates IIRC; though doubt it will help for site columns
getting by using Visual Studio.
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I'm trying to show someone a use for interfaces in a crazy situation they've created. They have several unrelated objects in lists, and need to perform an operation on two string properties in each object. I'm pointing out that if they define the properties...
Started by OwenP on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
So if you take the loop.
The foreach does a built in cast.
IEnumerable<SP> list) where SP: ISpecialProperties { foreach (var item in list) { Console.WriteLine("{0 just use a foreach on the lists you have.
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I have to implement an algorithm to decompose 3D volumes in voxels. The algorithm starts by identifying which vertexes is on each side of the cut plan and in a second step which edge traverse the cutting plan.
This process could be optimized by using ...
Started by chmike on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Most applications spending most overhead in creating a sorted list....
If you have a sorted list, adding to it takes more time, but accessing it is quicker.
list, adding to it takes no time, and accessing particular items takes extra time.
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Hello there - i'm trying to have 3 levels of lists all of which are sortable & draggable into each other. Basically trying to set up an easy way to manage navigation menus with multiple levels.
Its 90% there but for some reason it wont save an item into...
Started by daniel Crabbe on
, 4 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Edit: I used source code: 10px;} </style> </head> <body....
Or parent or what, it only sees if you drag a level 3 item to a level 1 list that the classes are the same and that it should be able to drag that item into that list.
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I am printing out a list of college majors we offer, then within each major, we have concentrations for each major.
Our Science Major has the following concentrations: Environmental Science & Forestry, Chiropractic, Chemistry, Biology
Here is a screen...
Started by Brad on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
When I was playing with the column....
You can-list-showing and adding a concentrations-list-showing class to the CSS and giving it a display.
You want to give the concentrations-list class a display: none; property in CSS.
Browsers.
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