Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Articles by Sarika Singh
142 articles
Difference between attributes and properties in python?
In Python, everything is an object, and every object has attributes and methods. Attributes are data variables that describe the object (such as name, age, or height), while properties are a special kind of attribute that use getter, setter, and deleter methods to control access to the underlying data. Attributes in Python Attributes are variables that belong to an object. They are usually defined in the __init__ method and accessed using dot notation ? Example class Dog: def __init__(self, name, age): self.name = name ...
Read MoreSaving Python functions in a Sqlite table
In Python, you can store a function as a text string in a SQLite database using the sqlite3 module. You cannot run the function directly from the database, but you can retrieve the code later and execute it using Python's exec() or eval() functions. This is helpful when you want to store or update function logic, like in code editors, plugins, or apps that run user-created scripts. Using sqlite3 and exec() Function The sqlite3 module is used to create and work with SQLite databases in Python. The exec() function can run Python code that is stored as a string, including ...
Read MoreThe return Statement in Python
The return statement in Python is used to send a value back from a function to its caller and exit the function. Since everything in Python is an object, the return value can be any object such as numeric types (int, float), collections (list, tuple, dict), or even other functions. Key features of the return statement − It cannot be used outside a function. Any code written after a return statement within the same block is dead code and will never be executed. If no value is specified, None is returned implicitly. Syntax def some_function(parameters): ...
Read MoreWhat is an anonymous function in Python?
Anonymous Function in Python An anonymous function is a function which doesn't have a name. We can return a value from an anonymous function, call it at the time of creation or, assign it to a variable. Instead of using the def keyword, which is used for regular functions, anonymous functions are defined using the lambda keyword. Hence, they are commonly referred to as lambda functions. Syntax Following is the syntax to create anonymous functions using the lambda keyword - lambda [args] : expression Although a lambda function can have only one expression, it can have any number ...
Read MoreHow can a Python function return a function?
In Python, functions are treated as first-class objects, which means that all functions in Python are treated like any other object or variable. You can assign a function to a variable, pass it as an argument to another function, return it from a function, or even store it in data structures like lists. One very useful feature in Python is that a function can return another function. This means you can define a function inside another function and return it as a result. This is used in advanced programming concepts like closures, decorators, and higher-order functions. Returning a Simple Function ...
Read MoreHow can we create recursive functions in Python?
Recursion is a process where a function calls itself repeatedly with new input values, slowly moving toward a condition where it stops. This stopping condition is called the base case. It prevents the function from running endlessly and allows it to return a final result. In Python, we can create recursive functions by simply defining a function that calls itself. Every recursive function has two main components − Recursive Case: This is when the function calls itself to solve a smaller part of the problem. It keeps the process going. Base Case: This is the stopping point. It tells ...
Read MoreHow to check if a string has at least one letter and one number in Python?
To check if a string contains at least one letter and one number in Python, you can - Use any() function with str.isalpha() function and str.isdigit() function to go through characters. Use re.search() function with appropriate regular expressions for pattern matching. Both methods are commonly used for validating input strings where letters and digits are required. Using any() Function with String Methods The any() function can be combined with str.isalpha() or str.isdigit() functions to check if at least one character in the string is a letter or a digit. This approach is used for partial checks within ...
Read MoreHow do I verify that a string only contains letters, numbers, underscores and dashes in Python?
To verify that a string contains only letters, numbers, underscores, and dashes in Python - Use re.fullmatch() function with a pattern like [A-Za-z0-9_-]+ for regex-based checking. Use set comparison with all() function for simple logic-based validation. Many systems restrict input to certain characters for security or formatting reasons. In this case, the allowed characters are alphabets (A–Z, a–z), digits (0–9), underscores (_), and hyphens (-). Using Regular Expressions The re module in Python allows you to define patterns to validate strings. You can use re.fullmatch() function to check if the entire string matches a specific pattern, such as ...
Read MoreWhat is the Python regular expression to check if a string is alphanumeric?
In this article, we focus on how to check if a string is alphanumeric using regular expressions in Python. Regular expressions are very useful for pattern matching and validation. To use them, first import the re library, which is included by default in Python. The regular expression ^[a-zA-Z0-9]+$ matches strings that contain only letters (both uppercase and lowercase) and numbers. This expression returns True if the string is alphanumeric; otherwise, it returns False. Using Regular Expressions By applying the re.match() function with the above pattern, you can check if the entire string contains only alphanumeric characters. Example: Checking an Alphanumeric ...
Read MoreHow to check if a string only contains certain characters in Python?
To check if a Python string contains only certain characters, you can use - set Comparison Regular Expressions Character Lists These approaches help you to verify whether every character in the string belongs to a defined set of allowed characters or not. Using Set Comparison You can create a set of allowed characters and check if all characters in the string belong to that set or not. If the string is a subset of the allowed set, it means the string contains only valid (accepted) characters. Example In the following example, we define a set of allowed numeric ...
Read More