Table of Contents
What is a list in Python and how do you create one
Let’s start with the basics. The easiest way to get a list, assuming you’ve already got a single value (which could be an integer or string), is to write:
1 mylist = []
2 a list with one item in it.
3 “”python list update”” : “What is a list in Python and how do you create one”
4 A function which returns the sum of the elements of its input argument. This function compares its two arguments, then returns that answer; e.g., if x is 3, it will return 6.
5 A function that was created by typing in a string (like an email address) and hitting return into the python prompt.
6 [How to] Categorize your data. How you do it is up to you, but here are some examples:
7 This is a list of items. Each item is underlined and has the word “item” typed after it in the name column
8 Here are two lists, each with three values underlined. The first one is the items, the other is the number of values total.
9 This is a list with two elements. Each element has a letter underlined and the word “element” after it in the name column.
10 This is a list that has 3 elements, each underlined and labeled by their operator and value (e.g., “>”, 5).
How to update a list in Python
This just checks that the number we’ve been passed is indeed a list, and if so, it sets “some_list” equal to the larger of the two.
lists.append([float(num)])
some_list = max(my_list, some_other_list)
That’s it! The list can now be used just like it was before the update. Pretty easy, right?
You might want to keep this in mind when updating your shopping list at home.
BONUS: If you’re wondering how that line where we check to see if a value is a list works, here’s the code:
def is_list(some_value):
if type(some_value) == type([]):
return True
elif type(some_value) == type([str()]):
return True
return False
Whew, that’s all for now. Hopefully you learned something useful.
I will be updating this article as new information is added to the subject. If you would like to read more, please visit: https://www.khanacademy.org/topic/palindrome-module
Examples of updating lists in Python
Using the simple code in 1, we can see that when you make changes to the list, it will preserve their order. When you remove an item, it will be immediately removed from the list: Note that the item being removed will be the last of the list.
In the second line below, we add the new value to the end of the list. The last item in the list is removed, and then new item is added to it. This will allow us to work with both of them, but also show that items in a list must be unique…
1) Create a list with some values, and then add some more values. Then remove an item from one of these lists:
Ways to improve your understanding of updating lists in Python
You can now use the Python List Update on your own. You should also take a look at the following related articles: Lists Python Program Documentation
Python List Update
List in Python
Set in Python
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