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Page 573 of 2109
Longest Substring Without Repeating Characters in Python
In Python, finding the longest substring without repeating characters is a classic string problem. We can solve this using different approaches: the Brute Force method which checks all possible substrings, and the more efficient Sliding Window technique using either a set or dictionary to track character positions. Common Methods The main approaches to find the longest substring without repeating characters are: Brute Force: Checks all possible substrings and verifies if they have unique characters. Sliding Window with Set: Uses a set to track characters in the current window and adjusts window boundaries dynamically. ...
Read MoreAdd Two Numbers in Python
Adding two numbers in Python is one of the most basic tasks, where we need to combine their values to get a total. In this article, we will explore different ways to add two numbers in Python using various operators and built-in functions. Using Arithmetic Operator To add two numerical values in Python, we can use the addition operator, represented by the "+" symbol. It is one of the arithmetic operators in Python that performs the addition operation. Example Here is the basic example that adds the two numbers using the addition operator (+) − ...
Read MoreLocating Modules in Python
Locating modules in Python refers to the process of how Python finds and loads a module into our current program when we are trying to import it. Python's standard library comes with a large number of modules that we can use in our programs with the import statement. Module Search Process When you write an import statement like import mymodule, the Python interpreter searches for the module in the following sequence ? The current directory − Python first checks the directory of the current script. PYTHONPATH Environment Variable ...
Read MoreVariable-length arguments in Python
You may need to process a function for more arguments than you specified while defining the function. These arguments are called variable-length arguments and are not named in the function definition, unlike required and default arguments. Syntax Syntax for a function with non-keyword variable arguments is this − def functionname([formal_args, ] *var_args_tuple): "function_docstring" function_suite return [expression] An asterisk (*) is placed before the variable name that holds the values of all nonkeyword variable arguments. This tuple remains empty if no additional arguments ...
Read MoreRequired arguments in Python
Required arguments are the arguments passed to a function in correct positional order. Here, the number of arguments in the function call should match exactly with the function definition. To call the function printme(), you definitely need to pass one argument, otherwise it gives a syntax error as follows ? Example with Missing Required Argument # Function definition is here def printme(str): "This prints a passed string into this function" print(str) return # Now you can call printme function printme() When ...
Read MorePass by reference vs value in Python
In Python Call by Value and Call by Reference are two types of generic methods to pass parameters to a function. In the Call-by-value method, the original value cannot be changed, whereas in Call-by-reference, the original value can be changed. Call by Value in Python When we pass an argument to a function, it is stored locally (in the stack memory), i.e the scope of these variables lies within the function and these will not affect the values of the global variables (variables outside function). In Python, "passing by value" is possible only with the immutable types ...
Read MoreCalling a Function in Python
Defining a function only gives it a name, specifies the parameters that are to be included in the function and structures the blocks of code. Once the basic structure of a function is finalized, you can execute it by calling it from another function or directly from the Python prompt. Following is the example to call printme() function ? Example # Function definition is here def printme(str): """This prints a passed string into this function""" print(str) return # Now you can call printme ...
Read MoreAutorun a Python script on windows startup?
Making a Python script run automatically when Windows starts can be useful for background tasks, monitoring applications, or system utilities. There are two main approaches: using the Startup folder or modifying the Windows Registry. Method 1: Using Windows Startup Folder The simplest approach is to place your Python script (or a shortcut to it) in the Windows Startup folder. Windows automatically runs all programs in this folder during boot. Startup Folder Location C:\Users\current_user\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ Steps to Add Script 1. Navigate to the Startup folder (you may need to enable "Show hidden files" ...
Read MoreBuilt-in Dictionary Functions & Methods in Python
Python dictionaries come with built-in functions and methods that make working with key-value pairs efficient and straightforward. These functions help you manipulate, query, and transform dictionary data. Built-in Dictionary Functions Python provides several built-in functions that work with dictionaries ? len() Function student = {'name': 'Alice', 'age': 20, 'grade': 'A'} print(len(student)) 3 str() Function student = {'name': 'Alice', 'age': 20} print(str(student)) print(type(str(student))) {'name': 'Alice', 'age': 20} type() Function student = {'name': 'Alice', 'age': 20} print(type(student)) ...
Read MoreProperties of Dictionary Keys in Python
Dictionary values have no restrictions. They can be any arbitrary Python object, either standard objects or user-defined objects. However, the same is not true for dictionary keys. There are two important points to remember about dictionary keys: No Duplicate Keys Allowed More than one entry per key is not allowed. When duplicate keys are encountered during assignment, the last assignment wins ? # Duplicate keys - last value overwrites previous ones student = {'Name': 'Zara', 'Age': 7, 'Name': 'Manni'} print("student['Name']:", student['Name']) print("Full dictionary:", student) student['Name']: Manni Full dictionary: {'Name': 'Manni', 'Age': 7} ...
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