nested

问题 I have a nested list comprising ~30,000 sub-lists, each with three entries, e.g., nested_list = [['x', 'y', 'z'], ['a', 'b', 'c']]. I wish to create a function in order to output this data construct into a tab delimited format, e.g., x y z a b c Any help greatly appreciated! Thanks in advance, Seafoid. 回答1: with open('fname', 'w') as file: file.writelines('\t'.join(i) + '\n' for i in nested_list) 回答2: >>> nested_list = [['x', 'y', 'z'], ['a', 'b', 'c']] >>> for line in nested_list: ... print

问题 I have a nested list comprising ~30,000 sub-lists, each with three entries, e.g., nested_list = [['x', 'y', 'z'], ['a', 'b', 'c']]. I wish to create a function in order to output this data construct into a tab delimited format, e.g., x y z a b c Any help greatly appreciated! Thanks in advance, Seafoid. 回答1: with open('fname', 'w') as file: file.writelines('\t'.join(i) + '\n' for i in nested_list) 回答2: >>> nested_list = [['x', 'y', 'z'], ['a', 'b', 'c']] >>> for line in nested_list: ... print

问题 I have the following data structure in R: df <- structure( list( ID = c(1L, 2L, 3L, 4L, 5L), var1 = c('a', 'b', 'c', 'd', 'e'), var2 = structure( list( var2a = c('v', 'w', 'x', 'y', 'z'), var2b = c('vv', 'ww', 'xx', 'yy', 'zz')), .Names = c('var2a', 'var2b'), row.names = c(NA, 5L), class = 'data.frame'), var3 = c('aa', 'bb', 'cc', 'dd', 'ee')), .Names = c('ID', 'var1', 'var2', 'var3'), row.names = c(NA, 5L), class = 'data.frame') # Looks like this: # ID var1 var2.var2a var2.var2b var3 # 1 1 a

问题 With a simple dictionary like: myDict{'key1':1, 'key2':2} I can safely use: print myDict.get('key3') and even while 'key3' is not existent no errors will be thrown since .get() still returns None. Now how would I achieve the same simplicity with a nested keys dictionary: myDict={} myDict['key1'] = {'attr1':1,'attr2':2} The following will give a KeyError: print myDict.get('key1')['attr3'] This will go through: print myDict.get('key1').get('attr3') but it will fail with adn AttributeError:

问题 I've been using Backbone for a total of 3 days now, and I can see that this has been asked about quite a lot, but honestly I'm just not getting it. I've been banging my head against the wall trying to get a basic app running parsing nested json and I just can't seem to work it out. It all works if I flatten out the json response, and remove the nested elements, but that's not how I will receive it. I've tried some examples with Backbone relational, but I'm really stuck here, a total backbone

问题 I'm having problems creating my form for creating a course. This is a part of my database scheme for which I'm trying to create a form: So which I'm trying to do is create a course where I can create sessions and dates (moment) attached to that session. It should look something like this: In my CourseAdmin class I have: protected function configureFormFields(FormMapper $formMapper) { $formMapper ->add('name', 'text', array('label' => 'Naam')) ->add('description', 'textarea', array('label' =>

问题 I have a dynamodb table with an attribute containing a nested map and I would like to update a specific inventory item that is filtered via a filter expression that results in a single item from this map. How to write an update expression to update the location to "in place three" of the item with name=opel,tags include "x1" (and possibly also f3)? This should just update the first list elements location attribute. ( "inventory": [ { "location": "in place one", # I want to update this "name":

问题 This seems like a pretty basic thing to do but although I've been using Django for around a year, I've never run into this scenario yet. In a lot of templating/web frameworks, template inheritance works a bit differently, in that usually it behaves more like wrappers, so if you have childtemplate.html, parenttemplate.html, and grandparenttemplate.html, then the finally rendering usually looks something like: grandparent header parent header child header child content parent content parent

问题 I am stuck with this question, can you solve the challenge? Here we go! We represent scores of players across a sequence of matches in a two level dictionary as follows: {'match1':{'player1':57, 'player2':38}, 'match2':{'player3':9, 'player1':42}, 'match3':{'player2':41, 'player4':63, 'player3':91}} Each match is identified by a string, as is each player. The scores are all integers. The names associated with the matches are not fixed (here they are 'match1','match2','match3'), nor are the

问题 I have a nested list looking like this: [['Vienna','2012', 890,503,70],['London','2014', 5400, 879,78], ['London','2014',4800,70,90],['Bern','2013',300,450,678], ['Vienna','2013', 700,850,90], ['Bern','2013',500,700,90]] What I want to do is summing every integervalue in the sublist with another sublist if city and year are equal. I first thought of a dictionary with city and year as key, but it caused problems sorting it. Then I had: {('Vienna','2012'):[890,503,70],('Bern','2013'):[800,1150