A string is a group of letters that may be used to represent a single word or a whole statement. Strings are easy to use in Python since they don't need to be declared explicitly and may be defined with or without a specifier. For manipulating and accessing strings, Python includes several built in functions and methods. In Python string is an object of the class String. In this article, we will discuss how to check if a string contains only lower case letters in Python. There are multiple approaches to this. Using the islower() method One way to verify ... Read More

In this article, we are going to find out how to check if a Unicode string contains only numeric characters in Python. We will use the inbuilt function isnumeric() to check if there are only numeric characters present in a string. It is similar to isdigit() and isdecimal() but it has a wider range of acceptance. It returns true for numbers, superscripts, subscripts, Fractions, Roman Numerals, etc. We can also use isdigit() and isdecimal() but isnumeric() is more efficient than the other two. Example 1 In the example given below, we are taking a Unicode string as input and we ... Read More

In this article, we are going to find out how to check if a string contains only certain characters in Python. The first approach is by using sets. We will declare a set with all the characters that are acceptable and we will check if the input string is a subset of the acceptable characters, if it is a subset then we will print True otherwise print False. Similar to sets in mathematics, sets are a type of data structure in Python. The order of the elements in a set is arbitrary and it could contain a variety of them. ... Read More

To check if a Python string contains only digits, we can use the built-in isdigit() method. This method returns True if all the characters in the string are digits, and False otherwise. Here's an example code snippet that demonstrates how to use isdigit(): To check if a string contains only digits Example In this example, we first define a string called my_string that contains only digits. We then use the isdigit() method to check if my_string contains only digits. Since it does, the output will be "The string contains only digits!". my_string = "1234" if my_string.isdigit(): ... Read More

In this article, we are going to focus on how to check if a string is alphanumeric using Regular expressions in Python. Regular expressions are used in both the techniques. Import the re library and install it if it isn't already installed to use it. After importing the re library, we can use the regular expression "[a-zA-Z0-9]+$.". This will return False if the string contains any special characters other than Alphabets and Numbers; otherwise, True will be returned. Example 1 In the example given below, we are taking a string as input and checking if it is alphanumeric using Regular ... Read More

Strings are an array of characters that are used to represent a word or any sentence. Strings in Python can be easily used as it does not require any explicit declaration and can be declared without any specifier. Strings in python also have many inbuilt functions and methods to manipulate and access the strings. Since in python everything is an object even String is also an object of the String class and has many methods. In this article, we are going to find out if a given string has only alphabets and numbers without any special symbols using python. We ... Read More

In this article, we are going to find out how to verify a string that contains only letters, numbers, underscores, and dashes in Python. The first strategy makes use of regular expressions. To use the re library, import it and install it if it isn't already installed. We use the regular expression "^[A-Za-z0-9_-]*$" after importing the re library. If the string contains any special characters other than Alphabets and Numbers, this will return False; otherwise, True will be returned. Example 1 In the example given below, we are taking a string as input and we are checking if it contains ... Read More

In this article, we are going to find out how to check if a string has at least one letter and one number in Python. Regular expressions is used in the first technique. Import the re library and install it if it isn't already installed to use it. After importing the re library, we can use the regular expression ('^(?=.*[0-9]$)(?=.*[a-zA-Z])'. This will return False if the string contains any special characters other than Alphabets and Numbers; otherwise, True will be returned. In regular expressions, the ?= syntax is used to call lookaheads. Lookaheads discover matches in the provided string by ... Read More

To check if a string has alphabets or numbers in Python, we can use some built-in methods like isalpha() and isdigit(). isalpha() returns True if all characters in a string are alphabets (letters), and False otherwise. isdigit() returns True if all characters in a string are digits (numbers), and False otherwise. Here are two examples that demonstrate how to check if a string has alphabets or numbers: To Check if a String has Alphabets or Numbers Example In this example, we first prompt the user to enter a string using the input() function. We then check if the string ... Read More

In Python, you cannot pass arguments by reference like you can in other programming languages like C++. However, there is a way to simulate pass by reference behavior in Python using mutable data types like lists and dictionaries. In Python, arguments are passed by assignment, which means that the parameter name in the function definition becomes a reference to the object passed as an argument. Therefore, there is no direct way to pass arguments by reference in Python. However, you can achieve a similar effect by passing a mutable object like a list or a dictionary to a function ... Read More