0 Basic python-8.4 in situ Modify List Method summary

1. Indexes and slices, with indexes and slices, take the corresponding values out and replace them with new values

Here's an example of using a slice swap value

The order of execution of the above methods is: (For Alist[0:2]=alist[1:3])

1) Remove the value corresponding to Alist[1:3] first.

2) Delete the value of Alist[0:2]

3) Replace the Alist[1:3] on the alist[0:2]

2. Replace with a list method

1) use Append and +

Using append

Use +

The results are the same, and they're all changed.

As you can see from the code above, the ID always does not change, that is, Alist does not create new objects, all using the same object

3. Sorting

>>> alist=[' aba ', ' ABB ', ' abc ', ' Abd ']>>> alist.sort () >>> alist[' ABb ', ' Abd ', ' abc ', ' ABA '] >>> Alist.sort (Key=str.lower, reverse=true) >>> alist[' Abd ', ' ABC ', ' ABb ', ' AbA ']>>> Alist.sort (Key=str.upper  , reverse=true) >>> alist[' Abd ', ' ABC ', ' ABb ', ' AbA ']>>> alist.sort ( Key=str.upper  

Change the order of alist by changing the parameters in the sort

Note: Sorting is for objects of the same type, and different types of objects cannot be sorted

>>> alist=[' AbA ', ' ABb ', ' ABC ', ' Abd ',123]>>> alist.sort () Traceback (most recent call last):  File "<pyshell#50>", line 1, in <module>    

4. Some other methods

Right here, thank you.

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0 Basic python-8.4 in situ Modify List Method summary