The code below will dynamically 'create' itself. For every iteration, the following command will issued: Show
Where number is the value of i in the loop. The result of this particular piece of code is three variables: list1, list2 and list3 being created and each assigned an empty list. You can generalize this to make practically anything you want. Do note that you cannot put this into a function as far as I know, because of how variables and global variables work. View Discussion Improve Article Save Article View Discussion Improve Article Save Article In real applications, we often have to work with multiple lists, and initialize them with empty lists hampers the readability of code. Hence a one-liner is required to perform this task in short so as to give a clear idea of the type and number of lists declared to be used. Method #1: Using loops We can enlist all the required list comma separated and then initialize them with a loop of empty lists. Python3
Output: The initialized lists are : List 1 : [] List 2 : [] List 3 : [] List 4 : [] Method #2: Using defaultdict() Method This is a method different and also performs a slightly different utility than the above two methods discussed. This creates a dictionary with a specific name and we have the option to make any number of keys and perform the append operations straight away as they get initialized by the list. Python3
Output: The initialized lists are : List 1 : [1] List 2 : [2] List 3 : [3] List 4 : [4] Method 4: Using * operator: Itdoes not create independent lists, but variables referring to the same (empty) list! Python3
Output: The initialized lists are all the same: List 1 : ["hello there"] List 2 : ["hello there"] List 3 : ["hello there"] List 4 : ["hello there"] How do you create multiple empty lists in Python?To create multiple empty lists: Use a list comprehension to iterate over a range object N times. Return an empty list on each iteration.
How do I make an empty list loop?Follow these three easy steps to create an empty list and append values to it in a for loop:. my_list = [] creates the empty list and assigns it to the name my_list . ... . for i in range(10): initializes the for loop to be repeated 10 times using loop variable i that takes on all values between 0, 1, …, 9.. my_list.. How do you initialize an empty list in Python?An empty list in Python can be created in two ways, either by using square brackets [] or by using the list() constructor.
How do you split a list into multiple lists in Python?Python Program to Split a List Into Evenly Sized Chunks. Using a for loop and range() method, iterate from 0 to the length of the list with the size of chunk as the step.. Return the chunks using yield . list_a[i:i+chunk_size] gives each chunk.. |
