Jan 27, 2012 · If you skip the end index, like in your question, it would take elements from the start index (x), pick every yth element until it reaches the end of the list if y is positive and beginning of the list if y is negative. E.g. l[1::-1] = [2,1] l[1::2] = [2,4,6] The default step size is 1.

joined_list = [item for list_ in [list_one, list_two] for item in list_] It has all the advantages of the newest approach of using Additional Unpacking Generalizations - i.e. you can concatenate an arbitrary number of different iterables (for example, lists, tuples, ranges, and generators) that way - and it's not limited to Python 3.5 or later.

Dec 3, 2016 · A list of lists named xss can be flattened using a nested list comprehension: flat_list = [ x for xs in xss for x in xs ] The above is equivalent to: flat_list = [] for xs in xss: for x in xs: flat_list.append(x) Here is the corresponding function: def flatten(xss): return [x for xs in xss for x …

Oct 5, 2012 · slicing is used to extract a sublist of a list where as indexing is used to retrive a specific element of list. slicedList = aList[beginIndex:endIndex] d[1:] refers to slicing the list d - refer to this. - This is slicing. c[1] is an element of the list c. - this is indexing

May 30, 2009 · The simplest way to display last element in python is >>> list[-1:] # returns indexed value [3] >>> list[-1] # returns value 3 there are many other method to achieve such a goal but these are short and sweet to use.

Looping over a nested list in Python. Printing out individual letters-1. Python 2.6:Trying to run an if ...

Feb 2, 2014 · Python’s lists are variable-length arrays, not Lisp-style linked lists. The implementation uses a contiguous array of references to other objects, and keeps a pointer to this array. This makes indexing a list a[i] an operation whose cost is independent of the size of the list or the value of the index.

Jul 8, 2018 · C:\Users\user>pyenv --version pyenv 2.64.11 C:\Users\name>pyenv pyenv 2.64.11 Usage: pyenv <command> [<args>] Some useful pyenv commands are: commands List all available pyenv commands duplicate Creates a duplicate python environment local Set or show the local application-specific Python version global Set or show the global Python version ...

Access a variable in a list of lists in Python. 0. Getting an entry in a List of lists in python. 2.

Sep 19, 2018 · All your return c.most_common()[-1] statement does is call c.most_common and return the last value in the resulting list, which would give you the least common item in that list. Essentially, this line is equivalent to: