slice - How slicing in Python works - Stack Overflow The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings Other than that I think the only difference is speed: it looks like it's a little faster the first way Try it yourself with timeit timeit() or preferably timeit repeat()
List of zeros in python - Stack Overflow See why [] is faster than list() There is a gotcha though, both itertools repeat and [0] * n will create lists whose elements refer to same id This is not a problem with immutable objects like integers or strings but if you try to create list of mutable objects like a list of lists ([[]] * n) then all the elements will refer to the same object
python - How to convert list to string - Stack Overflow Agree with @Bogdan This answer creates a string in which the list elements are joined together with no whitespace or comma in between You can use ', ' join(list1) to join the elements of the list with comma and whitespace or ' ' join(to) to join with only white space –
What is the difference between list and list [:] in python? When reading, list is a reference to the original list, and list[:] shallow-copies the list When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list Also, don't use list as a name since it shadows the built-in
How to initialize List lt;String gt; object in Java? - Stack Overflow List<String> supplierNames1 = new ArrayList<String>(); List<String> supplierNames2 = new LinkedList<String>(); List<String> supplierNames3 = new Vector<String>(); Bonus: You can also instantiate it with values, in an easier way, using the Arrays class , as follows:
View, group share contacts - Android - Contacts Help - Google Help Tap a Contact in the list Select an Option Create a group You can group contacts together with labels On your Android device, open the Contacts app At the top, tap Label New label Enter a label name Tap OK Add one contact to a label: Tap Add contact Select a contact Add multiple contacts to a label: Tap Add contact Touch and hold
Best way to remove elements from a list - Stack Overflow 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 When items are appended or inserted, the array of references is resized Some algorithm is applied to improve the performance of appending items repeatedly; when the array must be grown, some extra space is allocated so the
. net - Creating a List of Lists in C# - Stack Overflow A list of lists would essentially represent a tree structure, where each branch would constitute the same type as its parent, and its leaf nodes would represent values
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Remove list from list in Python - Stack Overflow What is a simplified way of doing this? I have been trying on my own, and I can't figure it out list a and list b, the new list should have items that are only in list a So: a = apple, carrot, lemon b = pineapple, apple, tomato new_list = carrot, lemon I tried writing code, but every time it always returns the whole list a to me