Logical Operations on String in Python

Name: Logical Operations and Splitting in Strings - Python Programming
Uploaded: 2022-06-09T10:24:48Z
Duration: 4 min 30 s

Last Updated : 14 Mar, 2024

For strings in python, boolean operators (and, or, not) work. Let us consider the two strings namely str1 and str2 and try boolean operators on them:

Python3

str1 = '' 
str2 = 'geeks'
  
# repr is used to print the string along with the quotes 
  
# Returns str1 
print(repr(str1 and str2))   
  
# Returns str1    
print(repr(str2 and str1))  
  
# Returns str2      
print(repr(str1 or str2))    
  
# Returns str2    
print(repr(str2 or str1))        
  
str1 = 'for'
  
# Returns str1 
print(repr(str1 and str2))   
  
# Returns str1    
print(repr(str2 and str1))  
  
# Returns str1      
print(repr(str1 or str2))   
  
# Returns str2      
print(repr(str2 or str1))        
  
str1='geeks'
  
# Returns False 
print(repr(not str1))           
  
str1 = ''  
  
# Returns True  
print(repr(not str1))           
  
  
# Coded by Nikhil Kumar Singh(nickzuck_007) 

Output:

''
''
'geeks'
'geeks'
'geeks'
'for'
'for'
'geeks'
False
True

Time Complexity: O(1)
Auxiliary Space: O(1)

The output of the boolean operations between the strings depends on the following things:

Python considers empty strings as having a boolean value of the ‘false’ and non-empty strings as having a boolean value of ‘true’.
For the ‘and’ operator if the left value is true, then the right value is checked and returned. If the left value is false, then it is returned
For the ‘or’ operator if the left value is true, then it is returned, otherwise, if the left value is false, then the right value is returned.

Note that the bitwise operators (|, &) don’t work for strings.