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

1.5

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

This article is contributed by Manjeet Singh .If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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