String operations in python with examples

Python string last modified January 9, 2023 In this article we work with string data in more detail. Advertisements A string in Python is a sequence of characters. It is a derived data type. Strings are immutable. This means that once defined, they cannot be changed. Many Python methods, such as replace, join, or split modify strings. However, they do not modify the original string. They create a copy of a string which they modify and return to the caller. Python string literals Python strings can be created with single quotes, double quotes, or triple quotes. When we use triple quotes, strings can span several lines without using the escape character. string_literals.py #!/usr/bin/python # string_literals.py a = "proximity alert" b = 'evacuation' c = """ requiem for a tower """ print(a) print(b) print(c) In our example we assign three string literals to a, b, and c variables. And we print them to the console. $ ./string_literals.py proximity alert evacuation requiem for a tower Advertisements If we want to create Unicode strings, we add a u or U character at the beginning of the text. unicode.py #!/usr/bin/python # unicode.py text = u'\u041b\u0435\u0432 \u041d\u0438\u043a\u043e\u043b\u0430\ \u0435\u0432\u0438\u0447 \u0422\u043e\u043b\u0441\u0442\u043e\u0439: \n\ \u0410\u043d\u043d\u0430 \u041a\u0430\u0440\u0435\u043d\u0438\u043d\u0430' print(text) In our example, we print Leo Tolstoy: Anna Karenina in azbuka. $ ./unicode.py Лев Николаевич Толстой: Анна Каренина We can use...

Note: All string methods returns new values. They do not change the original string. Method Description Converts the first character to upper case Converts string into lower case Returns a centered string Returns the number of times a specified value occurs in a string Returns an encoded version of the string Returns true if the string ends with the specified value Sets the tab size of the string Searches the string for a specified value and returns the position of where it was found Formats specified values in a string format_map() Formats specified values in a string Searches the string for a specified value and returns the position of where it was found Returns True if all characters in the string are alphanumeric Returns True if all characters in the string are in the alphabet Returns True if all characters in the string are ascii characters Returns True if all characters in the string are decimals Returns True if all characters in the string are digits Returns True if the string is an identifier Returns True if all characters in the string are lower case Returns True if all characters in the string are numeric Returns True if all characters in the string are printable Returns True if all characters in the string are whitespaces Returns True if the string follows the rules of a title Returns True if all characters in the string are upper case Converts the elements of an iterable into a string Returns a left justified version of the string Converts a string into lower c...

capitalize() Converts the first character to upper case str1 = "python" print(str1.capitalize()) output Python casefold() Converts string into lower case str1 = "PYTHON" print(str1.casefold()) output python center() Returns a centered string str1 = "PYTHON" print(str1.center(10)) output python count() Returns the number of times a specified value occurs in a string str1 = "python" print(str1.count("p")) output 1 endswith() Returns true if the string ends with the specified value str1 = "python" print(str1.endswith("n")) output True index() Searches the string for a specified value and returns the position of where it was found str1 = "python" print(str1.index("h")) output 3 islower() Returns True if all characters in the string are lower case str1 = "python" print(str1.islower() output True for more operations check out this list bellow

This tutorial explains Python String Methods and Operators with programming examples. Learn about string concatenation, substring, comparison, etc: Strings are one of the most popular and widely used sequences. For example, this tutorial contains letters, which together form words, sentences, and so on. In fact, strings are so important that almost all the programming languages we shall come across support this sequence in several ways. => In this tutorial, we shall look at how Python handles this type of sequence under the following topics: • What are Python Strings • String Operators • String Methods What Are Python Strings Python has data types and strings are one such data type, but specifically a textual data type. This string data type is a part of an ordered set of objects called sequences. In these sequences, we can find lists, tuples, and ranges but in this tutorial, we shall focus on strings that are immutable sequences of characters. NB: An immutable object is one whose state or elements can’t be changed once created. Strings are often text data that can be identified by double(“) or single(‘) quotes preceding and ending the text or in short a sequence of characters enclosed in quotes. Example 1: Define strings with double and single quotes. >>> text1 = "Hello World!" # string with double quotes >>> text1 'Hello World!' >>> text2 = 'Hello World!' # string with single quotes >>> text2 'Hello World!' >>> text1 == text2 # comparing the two quote forms True From the...

The string data type includes many built-in operations that we can use to compare, manipulate, and search within strings. We’ll cover several of them on this page, and we’ll also include links at the bottom to additional resources where all of them are listed. Length First and foremost is the len() built in function. It allows us to find the number of characters in a string. len() can actually be used to find the number of elements in any iterable aggregate data type. s = "This" print(len(s)) # 4 t = "This \" is \" that" print(len(t)) # 14 Notice that the second string, stored in variable t, only contains 14 characters. That is because \" only counts as a single character in the output, so it is stored as a single character in the string. The same applies to any of the special characters we’ve seen so far in this chapter. Comparison Next, we can use the standard comparison operators in Python to compare two strings. First, we could use the == operator to determine if two strings are equal (meaning they contain exactly the same characters in the same order), as in this example: s1 = "This" s2 = "That" print(s1 < s2) # False In this example, since “This” should come after “That” in the dictionary, the comparison s1 < s2 will return False. These operators are very helpful when sorting strings, which we’ll learn about in a later chapter. Note that lowercase letters are “greater than” uppercase letters due to their ascii values. Concatenation Another common string operation is ...

Basic String Operations Strings are bits of text. They can be defined as anything between quotes: astring = "Hello world!" astring2 = 'Hello world!' As you can see, the first thing you learned was printing a simple sentence. This sentence was stored by Python as a string. However, instead of immediately printing strings out, we will explore the various things you can do to them. You can also use single quotes to assign a string. However, you will face problems if the value to be assigned itself contains single quotes. For example to assign the string in these bracket(single quotes are ' ') you need to use double quotes only like this astring = "Hello world!" print("single quotes are ' '") print(len(astring)) That prints out 12, because "Hello world!" is 12 characters long, including punctuation and spaces. astring = "Hello world!" print(astring.index("o")) That prints out 4, because the location of the first occurrence of the letter "o" is 4 characters away from the first character. Notice how there are actually two o's in the phrase - this method only recognizes the first. But why didn't it print out 5? Isn't "o" the fifth character in the string? To make things more simple, Python (and most other programming languages) start things at 0 instead of 1. So the index of "o" is 4. astring = "Hello world!" print(astring.count("l")) For those of you using silly fonts, that is a lowercase L, not a number one. This counts the number of l's in the string. Therefore, it should prin...

Summary: in this tutorial, you’ll learn about Python string and its basic operations. Introduction to Python string A string is a series of characters. In Python, anything inside quotes is a string. And you can use either single or double quotes. For example: message = 'This is a string in Python' message = "This is also a string" Code language: Python ( python ) If a string contains a single quote, you should place it in double-quotes like this: message = "It's a string" Code language: Python ( python ) And when a string contains double quotes, you can use the single quotes: message = '"Beautiful is better than ugly.". Said Tim Peters' Code language: Python ( python ) To escape the quotes, you use the backslash ( \). For example: message = 'It\'s also a valid string' Code language: Python ( python ) The Python interpreter will treat the backslash character (\) special. If you don’t want it to do so, you can use raw strings by adding the letter r before the first quote. For example: message = r'C:\python\bin' Code language: Python ( python ) Creating multiline strings To span a string multiple lines, you use triple-quotes “””…””” or ”’…”’. For example: help_message = ''' Usage: mysql command -h hostname -d database name -u username -p password ''' print(help_message) Code language: Python ( python ) It’ll output the following if you execute the program: Usage: mysql command -h hostname -d database name -u username -p password Code language: Python ( python ) Using variable...

This tutorial explains Python String Methods and Operators with programming examples. Learn about string concatenation, substring, comparison, etc: Strings are one of the most popular and widely used sequences. For example, this tutorial contains letters, which together form words, sentences, and so on. In fact, strings are so important that almost all the programming languages we shall come across support this sequence in several ways. => In this tutorial, we shall look at how Python handles this type of sequence under the following topics: • What are Python Strings • String Operators • String Methods What Are Python Strings Python has data types and strings are one such data type, but specifically a textual data type. This string data type is a part of an ordered set of objects called sequences. In these sequences, we can find lists, tuples, and ranges but in this tutorial, we shall focus on strings that are immutable sequences of characters. NB: An immutable object is one whose state or elements can’t be changed once created. Strings are often text data that can be identified by double(“) or single(‘) quotes preceding and ending the text or in short a sequence of characters enclosed in quotes. Example 1: Define strings with double and single quotes. >>> text1 = "Hello World!" # string with double quotes >>> text1 'Hello World!' >>> text2 = 'Hello World!' # string with single quotes >>> text2 'Hello World!' >>> text1 == text2 # comparing the two quote forms True From the...

The string data type includes many built-in operations that we can use to compare, manipulate, and search within strings. We’ll cover several of them on this page, and we’ll also include links at the bottom to additional resources where all of them are listed. Length First and foremost is the len() built in function. It allows us to find the number of characters in a string. len() can actually be used to find the number of elements in any iterable aggregate data type. s = "This" print(len(s)) # 4 t = "This \" is \" that" print(len(t)) # 14 Notice that the second string, stored in variable t, only contains 14 characters. That is because \" only counts as a single character in the output, so it is stored as a single character in the string. The same applies to any of the special characters we’ve seen so far in this chapter. Comparison Next, we can use the standard comparison operators in Python to compare two strings. First, we could use the == operator to determine if two strings are equal (meaning they contain exactly the same characters in the same order), as in this example: s1 = "This" s2 = "That" print(s1 < s2) # False In this example, since “This” should come after “That” in the dictionary, the comparison s1 < s2 will return False. These operators are very helpful when sorting strings, which we’ll learn about in a later chapter. Note that lowercase letters are “greater than” uppercase letters due to their ascii values. Concatenation Another common string operation is ...

Basic String Operations Strings are bits of text. They can be defined as anything between quotes: astring = "Hello world!" astring2 = 'Hello world!' As you can see, the first thing you learned was printing a simple sentence. This sentence was stored by Python as a string. However, instead of immediately printing strings out, we will explore the various things you can do to them. You can also use single quotes to assign a string. However, you will face problems if the value to be assigned itself contains single quotes. For example to assign the string in these bracket(single quotes are ' ') you need to use double quotes only like this astring = "Hello world!" print("single quotes are ' '") print(len(astring)) That prints out 12, because "Hello world!" is 12 characters long, including punctuation and spaces. astring = "Hello world!" print(astring.index("o")) That prints out 4, because the location of the first occurrence of the letter "o" is 4 characters away from the first character. Notice how there are actually two o's in the phrase - this method only recognizes the first. But why didn't it print out 5? Isn't "o" the fifth character in the string? To make things more simple, Python (and most other programming languages) start things at 0 instead of 1. So the index of "o" is 4. astring = "Hello world!" print(astring.count("l")) For those of you using silly fonts, that is a lowercase L, not a number one. This counts the number of l's in the string. Therefore, it should prin...