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python string operations

Tags: string python

  • In python, we have some operations that perform the specified operations on strings.
  • In this, the string must enclose with the codes that might be single or double.
  • Here are some python string operations.

1.  String assignment operator:

  • In this operator, the string is assigned to any of the variables.
  • The string may be in single or double codes.
  • It is represented by " =" equal to symbol.

Example:  string1="python"
                  string2="java"

In the above example, we assign a "python" to string 1 and "java" to string 2 by using the" =" symbol.

# write a python program for the string assignment operator.

  1. str1="welcome to python"
  2. str2="Today topic is string operator"
  3. str3="python is easy  language"
  4. print(str1)
  5. print(str2)
  6. print(str3)
output:  welcome to python
             Today topic is string operator
             Python is easy to language



2. Cancatenate operator:

  • This operator has used to cancate the strings.
  • Concatenation means joining or combing the strings by using the plus symbol between the strings.
  • It is represented by the symbol " +".
       Syntax:  (str1+str2)

       Example:   "Hello"  +"world"
  •  Result is : "Helloworld"

#Write a python program using string cancatenate operator.

  1. str1="a"
  2. str2="is"
  3. str3="alphabet"
  4. print(str1+str2+str3)
output: aisaphabet


3. String repetition operator: 

  • In this operator, the string is repeated the number of times that we declare in the code.
  • It is represented by the symbol "*".
Syntax:  str*n    Here n is the number of times that the string can be repeated.

Example: str="apple"
                 str*2
The result is: apple apple
  • here we declare the string as apple it should be repeated for 2 times.

#Write a python code using the string repetition operator.

  1. str="welcome"
  2. print(str*5)
output: welcome welcome welcome


       

       4.Slicing operator:  

  • In this slicing operator, the strig is divided according to the given index values.
  • The string can y accessed by using the index.
  •  It is having positive index and negative index values.
  • Positive values start from  0 from left to right.
  • The negative index starts from -1 from right to left.
  • [:] this gives all values in the index 0 to end. 
  • The slicing never shows the error, if the index is out of range, it shows an empty list[].  

Syntax: str[]

Example:   str="string"
                   str[0]=s
                   str[1]=t
                   str[-1]=g
  • In the above example, the s index is 0 so it returns s when we write str[0].

#write a python code for slicing operator.

  1. str="coding"
  2. print(str[0])
  3. print(str[-1])
  4. print(str[1:6])
  5. print(str[1:])
  6. print(str[:3])
  7. print(str[1:-4])
  8. print(str[-3])
output:  c
             g
             oding
             oding
             cod
              o
              i                                                                                 


                                       

5. String comparison operator:

  • In the string comparison operator, we compare the strings.
  • In this, we have 2 operator
     1.Equal to(==): If both the strings are the same then it returns true else false.
  • It is represented by the symbol "==".
     Syntax:str1==str2.

       2.not equal(!=): If both strings are not the same then it true else false.
  • It is represented by the symbol "!=".
Syntax:  str1!=str2

#write a python coding using the python string comparison operator.

  1. str1="my name is A"
  2. str2="my name is B"
  3. str3="my name is A"
  4. str4="apple"
  5. str5="apple"
  6. print(str1==str2)
  7. print(str1==str1)
  8. print(str4==str5)
  9. print(str4!=str1)
  10. print(str3!=str2)
output: false
            true
            true
            true
            true



6. Membership operator:

  • In the membership operator, we check the string that is declared in the code is present in the given list or not.
  • There are 2 operators in membership.
  1. In:  It tells that the string is present in the given list.If it is present returns true else false.
  2. Not in: It tells that the string is not present in the given list returns true else false.
Example: str="string"
                r in the str
       The result is: true

#write python code using membership operator.

  1. str="Hello world"
  2. print("H" in str)
  3. print('s' in str)
  4. print("a" not in str)
output:  true
             false
             true



7. Escape sequence operator:

  • This operator is used when an unallowed character is present in the given string.
  • It is represented by the "\" symbol called backslash. 

Write a python program for escape sequence operator.

  1. str="welcome to \"python\" classes"
  2. print(string)
output: welcome to "python" classes





8.String formatting operator:

  • It is used to format the string as per our requirement.
  • There are different types of formats.
  • It is denoted by that "%" symbol.
  • Each format has its own meaning.
%d:  used for sign decimal integer.
%s: used for string.
%f: used for floating.
%u: used for unsigned decimal integer.
%c: used for the character.

#write a python code using the string formatting operator.

  1. name="abc"
  2. marks=78
  3. str1='hi % s'%(name)
  4. print(str1)
  5. str2='hi% s,my marks is %f'%(name,marks)
  6. print(str2)
output: hiabc,my marks is 78.000000




This post first appeared on Java Tutorial - InstanceOfJava, please read the originial post: here

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