A list in Python may be a collection of things, which can be of any type 🔢 (strings 🔤, integers , floating point numbers, etc.). Python Lists are ordered , mutable , and permit duplicate elements 🔁. They are made utilizing square brackets [], and commas separate things.
List in Python are a data structure that can hold different things and are simple to control and work with. With the assistance of lists in Python, designers can rapidly construct productive applications that can store, prepare, and oversee huge sums of data.
One industry example to explain a python list is in the retail industry, specifically in the inventory management system. The list may look something like this:
In this framework, the store director or stock controller keeps a list of all the items or things accessible within the store. This list regularly incorporates the product name, description, quantity, cost, and other significant points of interest.
For occasion, let's say that a clothing store includes a list of all the T-shirts they have in stock.
In this case, the list is a reference for the store's stock. The store supervisor can rapidly check the list to see which items are in stock and their costs. Furthermore, the list can track stock levels and make educated choices, almost restocking certain things or altering costs.
Overall, lists are valuable tools in various industries and can be used to organize and manage information efficiently.
Creating a list in Python is a straightforward process. The syntax for creating a list is simple and intuitive, making it a great way to store data in a structured format .
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We can also create an empty list and add elements to it later:
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In this example, we first create an empty list called "numbers" using empty square brackets. We can add elements to this list later.
In Python, the list() function may be a built-in function that can be utilized to form a modern list from an iterable object such as a tuple, string, or set. The list() function takes the iterable object as an argument and returns a new list that contains all the components from the iterable object in the order they appear up 🔢.
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In Python, you can access individual elements in a list by utilizing their index values. The index value of the primary element in a list is 0, and the second element has a list of 1, and so on. To induce a specific element in a list, you'll utilize the square bracket notation 🔢 with the index value inside the brackets.
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In this example, we have a fruit list containing four elements. We access each element by using its index value inside the square brackets. The first element in the list has an index value of 0, so fruits[0] returns "apple". Similarly, fruits[1] returns "banana", fruits[2] returns "orange", and fruits[3] returns "grape".
You can also use negative index values to access elements from the end of the list. The last element in a list has an index value of -1, and the second-to-last element has an index value of -2, and so on.
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In this case, we get to each element within the list by utilizing its negative index value inside the square brackets. The last element within the list has an index value of -1, so fruits[-1] return "grape". Additionally, fruits[-2] returns "orange", fruits[-3] returns "banana", and fruits[-4] returns "apple”.
List slicing is a way to extract a portion of a list in Python. You can slice a list by specifying a range of index values inside the square brackets using the start:stop: step, the same as string slicing notation.
Here's how it works:
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In this example, we have a fruit list containing five elements. We use the slice notation to extract a portion of the list and assign it to a new variable.
In Python, we have the following methods for list manipulation:
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These methods allow adding, removing, or modifying elements in a list as needed.
Here are some of the popular built-in functions for lists in Python:
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These built-in functions can be very useful when working with lists in Python. They allow you to perform common operations such as finding the length of a list, sorting the elements, or iterating over the list with an index.
This lesson gives an outline of list in Python, including how to create and manipulate them, access list items, and utilize list cutting. It too covers prevalent built-in functions for lists, len(), min(), max(), and sum().
Key takeaways:
Quiz:
Answer: b. A collection of ordered and mutable elements.
Answer: b. variable_name = [list of elements separated by comma]
Answer: c. Both a and b
Answer: a. -1
Answer: c. Lists are ordered
Answer:b. list_name[-2]
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