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Python String Methods | Set 2 (len, count, center, ljust, rjust, isalpha, isalnum, isspace & join)

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  • Difficulty Level : Easy
  • Last Updated : 07 Jul, 2022
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Some of the string methods are covered in the set 3 below
String Methods Part- 1

More methods are discussed in this article

1. len() :- This function returns the length of the string.

2. count(“string”, beg, end) :- This function counts the occurrence of mentioned substring in whole string. This function takes 3 arguments, substring, beginning position( by default 0) and end position(by default string length).




# Python code to demonstrate working of 
# len() and count()
str = "geeksforgeeks is for geeks"
   
# Printing length of string using len()
print (" The length of string is : ", len(str));
  
# Printing occurrence of "geeks" in string
# Prints 2 as it only checks till 15th element
print (" Number of appearance of ""geeks"" is : ",end="")
print (str.count("geeks",0,15))

Output:

 The length of string is :  26
 Number of appearance of geeks is : 2

3. center() :- This function is used to surround the string with a character repeated both sides of string multiple times. By default the character is a space. Takes 2 arguments, length of string and the character.

4. ljust() :- This function returns the original string shifted to left that has a character at its right. It left adjusts the string. By default the character is space. It also takes two arguments, length of string and the character.

5. rjust() :- This function returns the original string shifted to right that has a character at its left. It right adjusts the string. By default the character is space. It also takes two arguments, length of string and the character.




# Python code to demonstrate working of 
# center(), ljust() and rjust()
str = "geeksforgeeks"
   
# Printing the string after centering with '-'
print ("The string after centering with '-' is : ",end="")
print ( str.center(20,'-'))
  
# Printing the string after ljust()
print ("The string after ljust is : ",end="")
print ( str.ljust(20,'-'))
  
# Printing the string after rjust()
print ("The string after rjust is : ",end="")
print ( str.rjust(20,'-'))

Output:

The string after centering with '-' is : ---geeksforgeeks----
The string after ljust is : geeksforgeeks-------
The string after rjust is : -------geeksforgeeks

6. isalpha() :- This function returns true when all the characters in the string are alphabets else returns false.

7. isalnum() :- This function returns true when all the characters in the string are combination of numbers and/or alphabets else returns false.

8. isspace() :- This function returns true when all the characters in the string are spaces else returns false.




# Python code to demonstrate working of 
# isalpha(), isalnum(), isspace()
str = "geeksforgeeks"
str1 = "123"
   
# Checking if str has all alphabets 
if (str.isalpha()):
       print ("All characters are alphabets in str")
else : print ("All characters are not alphabets in str")
  
# Checking if str1 has all numbers
if (str1.isalnum()):
       print ("All characters are numbers in str1")
else : print ("All characters are not numbers in str1")
  
# Checking if str1 has all spaces
if (str1.isspace()):
       print ("All characters are spaces in str1")
else : print ("All characters are not spaces in str1")

Output:

All characters are alphabets in str
All characters are numbers in str1
All characters are not spaces in str1

9. join() :- This function is used to join a sequence of strings mentioned in its arguments with the string.




# Python code to demonstrate working of 
# join()
str = "_"
str1 = ( "geeks", "for", "geeks" )
  
# using join() to join sequence str1 with str
print ("The string after joining is : ", end="")
print ( str.join(str1))

Output:

The string after joining is : geeks_for_geeks

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