Create a list of numbers in python
In order to understand how to create a list of numbers in Python, one must first understand some other terminology: -List: A list is a variable that stores more than one value. -Index (or subscript): An index is the position of an item in a list. -Element: An element is what we call each value in a list.
Step 1: Defining the List
In order to define a list, we must first create a variable. Lists are defined with square brackets ([ and ]). A list can have any amount of elements, does not have to be the same length. For example, [1, 2, 4] is a valid list.
x = [] # x is now an empty list
Step 2: Adding Elements to the List
To add elements to a list we use the following syntax:
x.append(element) # appends element at the BEGINNING of x x.insert(index, element) # inserts element at specific index x.pop() # deletes and returns last item in x (if >0) x.remove(index) # deletes element at specific index x.clear() # deletes whole list and all elements x.sort() # sorts list in ascending order
Step 3: Accessing Elements of the List
To access elements of a list we use the subscript syntax to refer to an index. For example, if you want to get the third element of a list, you will write:
Use the range() function to create a list of numbers
this_list = range(0, 10) print(this_list) #This will output the list of numbers from 0 to 9.
The range() function is one of the most useful functions in Python. It not only takes a list of numbers, but also options for step sizes and a start and end value. This allows it to be used for lists of almost anything, which makes it an incredibly powerful tool when managing data from other sources, like the Web or databases.
The first step in using the range() function is to define a list of numbers to use. This can be seen by printing the list of numbers above.
this_list = range(0, 10) print(this_list) #This will output the list of numbers from 0 to 9.
After defining the start and end values for our array, we are ready to use it. There are two common ways to use the list of numbers. The first is to iterate over each number individually in the list. This can help you do things like:
Generate a sequence of numbers for calculations (like summing a series of numbers, or finding the average)
