Python Strings & Built-in String Methods.pptx

Python Strings & Built-in String Methods.pptx

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  Python Strings Mrs.S.RAJAPRIYA, M.S(IT)., AssistantProfessor, Department of Computer Science (self) V.V.Vanniaperumal College for Women, Virudhunagar
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  Python Strings Python treatsstrings as contiguous series of characters delimited by single, double or even triple quotes . We can declare and define a string by creating a variable of string type. This can be done in several ways which are as follows: §name = "India" §graduate = 'N‘ §country = name §nationality = str("Indian") Built-in String Class
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  Three Main Operationsin string Concatenating: We can concatenate two strings using + operator. Example: s1=“Welcome to “ s2=“Python Programming” s3=s1+s2 print(s3) Output: Welcome to Python Programming
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  Three Main Operationsin string Appending: We can add one string to the end of another string using append operator +=. Example: s1=“Hello,“ name=input(“Enter Your Name:”) s1 += name s1 += “.Welcome to the World of Python” print(s1) Output: Enter Your Name: Arun Hello, Arun .Welcome to the World of Python
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  Three Main Operationsin string Repeating: We can repeat a given string n number of times using * operator . Example: s1=“Hello World“ print(s1*3) Output: Hello World Hello World Hello World
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  Str() function  Thestr() function is used to convert values of any data type to string type.  Example: s1=“Hello” s1=“Hello” n=7 n=7 s2=s1+str(n) s2=s1+n print(s2) print(s2) Output: Hello7 Output: TypeError
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  Strings are Immutable Python strings are immutable which means that once created they cannot be changed.  Whenever you try to modify an existing string variable, a new string is created.  Using id() function, we can identify the memory address of a particular object. Example: Program to demonstrate string references using id() function s1 = “Hello” Output print(s1) Hello print(id(s1)) 45093344 s2 = “World” World print(s2) 45093312 print(id(s2)) s1 += s2 print(s1) Hello World print(id(s1)) 43861792
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  Built-in String Methods Python support various built-in methods to manipulate strings.  Each method is invoked or called on an object.  Some of the commonly used built-in methods are:
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  Built-in String Methods
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  Built-in String Methods
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  Thank You