Oct 31, 2008 · The keyword when using append is Object. If you try to use extend and you pass in a dictionary, it will append the key, and not the whole hash to the end of the array.

b += a Now I wonder: which of those two options is the 'pythonic' way to do list concatenation and is there a difference between the two? (I've looked up the official Python tutorial but couldn't find …

As we can see, extend with list comprehension is still over two times faster than appending. Generator expressions appear noticeably slower than list comprehension. append_comp only introduces …

Is there an article or forum discussion or something somewhere that explains why lists use append/extend, but sets and dicts use add/update? I frequently find myself converting lists into sets …

In general, if you're appending/extended an existing list, and you want to keep the reference to the same list (instead of making a new one), it's best to be explicit and stick with the append ()/extend () methods.

The append -method however does literally what you ask: append the object on the right-hand side that you give it (the array or any other object), instead of taking its elements. An alternative Use extend() …

Apr 8, 2015 · 22 As others have pointed out, extend takes an iterable (such as a list, tuple or string), and adds each element of the iterable to the list one at a time, while append adds its argument to the end …

Jun 24, 2012 · Possible Duplicate: Python append() vs. + operator on lists, why do these give different results? What is the actual difference between "+" and "append" for list manipulation in Python?

Sep 16, 2014 · 6 list.extend() takes an iterable and appends all elements of the iterable. Dictionary by default iterates over its keys, so all the keys are appended to the list. list.append() takes the object as …

Dec 9, 2016 · Num list em Python, existem os métodos append e extend. Qual é a diferença entre eles e quando devo usar cada um?