1>>> Li = ['a','b','C']2>>> Li.extend (['D','e','F']) 3>>>Li4['a','b','C','D','e','F']5>>>Len (LI)667>>> li[-1]8 'F'9>>> Li = ['a','b','C']Ten>>> Li.append (['D','e','F']) One>>>Li A['a','b','C', ['D','e','F']] ->>>Len (LI) -4 the>>> li[-1] -['D','e','F']
- Lists's two methods extend and append look similar, but in fact they are completely different. Extend accepts a parameter, which is always a list, and adds each element in the list to the original list.
- There are 3 elements (' A ', ' B ' and ' C ') in the list, and a second list with 3 elements (' d ', ' e ' and ' F ') is expanded, so there are 6 elements in the new list.
- On the other hand, append accepts a parameter, which can be any data type, and is simply appended to the tail of the list. Call the Append method here using a list parameter containing 3 elements.
- The list that originally contains 3 elements now contains 4 elements. Why is it 4 elements? Because the last element you just appended is a list. The list can contain any type of data, including other lists. This may be the result you want, maybe not. If your intent is extend, do not use append.
Python:extend (extension) and append (append) between the days and the ground
