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Python Articles
Page 188 of 854
Alternate element summation in list (Python)
The given task is to perform an alternate summation on a Python List. For example, adding the elements at even indices (0, 2, 4) or odd indices (1, 3, 5), depending on the requirement. This means we need to add every other element from the given list. Let us see an input scenario - Scenario Input: [11, 22, 33, 44, 55] Output: 99 Explanation: Here, we are going to add the elements at the even indices by using the slicing [::2]. Alternate Element Summation Using sum() Function The alternate element summation in a list (Python) can ...
Read MoreAlternate range slicing in list (Python)
Slicing is used to extract a portion of a sequence (such as a list, a tuple, string) or other iterable objects. Python provides a flexible way to perform slicing using the following syntax. list[start:stop:step] Alternate Range Slicing The alternate range slicing is used to retrieve the elements from a list by skipping the elements at a fixed interval, using the step parameter. For example, if we want every second element from a list, we set step=2. Let’s observe some examples to understand how alternate range slicing works. Example 1 Consider the following ...
Read MoreAlternate Cycling in Python List
Lists in Python are ordered collections that store and manipulate a sequence of elements. In this article, we are going to learn alternate cycling in Python. It is used when we need to work with the alternate element, instead of processing every element in the list.Alternate cycling is the process of accessing or iterating through list elements by skipping elements in a fixed pattern. Following is an example scenario - Scenario Input:[1, 2, 3, 4, 6] Output:[1, 3, 5] Explanation: In this case, the alternate cycling starts from the index 0 and skips the next ...
Read MoreAdding Custom Column to Tuple list in Python
In this article, we will learn how to add a custom column in a tuple list (i.e., a list of tuples) in Python. Tuples store sequences of data enclosed in parentheses as shown below: Tuples = (11, 22, 33) And the list of tuples is represented as follows: List of tuples = [(11, 22, 33), (44, 55, 66), (77, 88, 99)] Suppose we have a list called "students" that stores student data (i.e., name, age) as tuples. If we represent it in the form of rows and columns, the first element of the tuples ...
Read MoreAdding list elements to tuples list in Python
Our task is to add list items to a tuple list (i.e, a list of tuples) in Python. Tuples store sequences of data enclosed in parentheses, as shown below: Tuples = (11, 22, 33) And the list of tuples is represented as follows: List of tuples = [(11, 22, 33), (44, 55, 66), (77, 88, 99)] Scenario Suppose we have a list of tuples, "a", and another list of items, "b". We have to add all items of the "b" to each item of the "a" as follows - Input Lists: a = [(2, 3), ...
Read More__exit__ in Python
In Python, some special methods have names that start and end with double underscores. These are called dunder methods. One such method is __exit__, which is used in context managers for cleanup tasks. Context Manager in Python Context Mangers helps to manage resources such as files, database connections, or network links. It sets up a temporary environment to run a block of code. When the block ends, Python closes the file or disconnects the connection automatically. This prevents unnecessary resource consumption when we leave a file open or keep a connection (such as, network, database) active. Python runs context managers ...
Read More__name__ (A Special variable) in Python
Python does not require a main function to start execution like many other programming languages. Instead, it uses a special built-in variable called __name__ to determine how a Python script is being executed (directly or, is it imported as a module into another script). In this article, we will learn about the __name__ variable in Python. Understanding the __name__ Variable The __name__ variable is a built-in variable that holds the name of the current module. When you run a script directly, Python sets __name__ to __main__. If the same script is imported into another file as a module, __name__ ...
Read More__future__ Module in Python
What is the __future__ Module? The __future__ is a built-in Python module that is used to import features from newer versions of Python into older versions. This helps you to write code that will work the same way in both old and new versions of Python. It is mainly used when you are migrating code from Python 2 to Python 3, or when you want to try out new features before they become standard (default) in future releases. For example, in older Python versions, dividing two integers would return an integer. But if you import the division feature like this: ...
Read More\\nHow to print out the first character of each list in Python?
A Python list is a built-in, mutable datatype that stores multiple items or elements, separated by commas, within square brackets [ ]. The index of a list in Python starts from 0 up to length-1. We can retrieve/access elements at a particular index as follows - list_name[index] The given task is to write a Python program that prints the first character of each element in a list. But, before that, let's see some example scenarios: Scenario 1 For example, if our list contains string values, the output should be the first character of each string. Input: list = ...
Read More10 Interesting Python Cool Tricks
With the increase in popularity of the Python programming language, more and more features are becoming available for Python developers. Usage of these features helps us to write efficient code. In this article, we will see 10 Python tricks that are very frequently used. Reversing a List We can reverse a given list by using the reverse() function. It returns the elements of the current list in reverse order. It works with both numeric and string datatypes. Example Let's see how to use the reverse() function in your Python program to reverse a list of strings: List = ["Shriya", "Lavina", "Sampreeti" ...
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