How To Use Python String IsLower() Method – Easy Python Code Examples

In this tutorial, we’ll learn what Python string islower() method is and how to properly use it. We’ll go through multiple Python code examples to understand how islower() method works in Python.

Introduction: Python String islower() Method

This method will return True if a string contains only lowercase alphabets and will return False is atleast one alphabet is uppercase.

Syntax of islower() Method

string.islower()

• Python string islower() method does not take any arguments.
• This method returns True if a string has only lowercase alphabets and will return False if atleast one alphabet is in uppercase format.

Example 1: islower() Method Applied on a Python String

val='this is python programming'
print(val.islower())

Output

True

Python string islower method return True as all the alphabets are in lowercase format in the above string.

See below examples in which string contains uppercase alphabets as well.

print( 'this is Python Programming'.islower() )
print( 'Python'.islower() )
print( 'python Programs'.islower() )

Output

False 
False 
False

Example 2: islower() used in If Else Condition inside For Loop

listStr=['python','python Language','programming in python','python3']
for val in listStr:
    if val.islower()==True:
        print(val+' - islower method returns True')
    else:
        print(val+' - islower method returns False')

Output

python - islower method returns True 
python Language - islower method returns False 
programming in python - islower method returns True 
python3 - islower method returns True

Example 3: islower() Method Return Value

val= 'python3 programming language in 2022'
returnedValue= val.islower()
print( returnedValue )

Output

True