Python program for beginners - String operations.

 String is a collection of characters. It is stored in sequence as an array. Normally a string in python is assigned a value by the following syntax.

Syntax:

String_Variable= " String value "

Eg:

a= " Best wishes"

where, a is a variable that represents string. "Best wishes" is the value assigned to string.

Next, a simple python program to display this string is given below.

a="Best wishes"

print(a)

The Program and its output are like this.

The operations on a string variable are listed here.

• Extracting a character or set of characters.
• Finding the total number of characters (Length) in a string
• Converting upper case to Lowercase and vice versa.
• Adding two strings
• Replacing characters
• Splitting the string into sub string
• White space removing

The sample code is given as below.

• Extracting a character or set of characters.

          a="Best Wishes"

          print (a[5:11])

         

          It extracts "Wishes" from String a and displays it on the screen.

• Finding the total number of characters (Length) in a string

          a="Best Wishes"

          print(Len(a))

         This code gives the output as 11.

• Converting upper case to Lowercase and vice versa.

          a="best wishes"

          print (a.upper())

          This gives the uppercase of the string a. That will be "BEST WISHES".

          b="WELCOME"

          print (b.lower())

          output is "welcome".

• Adding two strings

         a="Hi"

         b="Hello"

         print(a+b)

         It gives you  "HiHello" as output.

• Replacing characters

          a="Good"

          print(a.replace("G","F"))

          This code replaces the "G" to "F". Hence the output is "FOOD"

• Splitting the string into sub string

          a="Best wishes"

          b=a.split(" ")

          print (b)

    

         split function splits the string based on the white space in the string here. 

         The space is between Best and wishes. So, the output is [ 'Best'  'wishes'] 

• White space removing

          a=" Welcome "

          print(a.strip())

          This code removes the white space in the beginning and the end. Here, the output is " Welcome".

 These are the basic string operations in python.