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The islower() string method returns True if all the characters in a string are lower case letters.

Note : None of the string methods change the original string and only return a new string which reflects the change performed by the string method, hence the returned string must be stored or used(if needed to reflect the result), otherwise it is lost.

Signature of islower() method

The islower() method has no parameters, so we don't have to worry about passing it some value.

# Signature of islower() method 
islower()

Calling islower() method on a string object.




# Python - Method islower() Example



# Creating a string
s1 = ('scooby dooby doo!')


# Printing the original string
print('Value of string  : ', s1)


# Calling  the lower() method on string object 
print('Calling the islower() method  on string : ', s1.islower())





Output




Value of string : scooby dooby doo!
Calling the lower() method  on string : True


A string object was initialized to a value Scooby dooby doo!. When the method islower() was called on this string object, it returned a bool value False, because not all the characters in the invoked string are in lower case letters.




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Another example of islower() method




# Python - Method islower() Example



# Calling islower() method on a string of all lower case characters
print('dennis the menace'.islower())


# Calling islower() method on a string of only digits
print('123'.islower())



# Calling islower() method on a string of digits and lower case characters
print('123.. go!'.islower())



# Calling islower() method on a string of all lower case characters except one lowercase letter
print('I dream of jeannie!'.islower())


# Calling islower() method on a string
print('#1 duck tales, 2# talespin, #3 donald duck.'.islower())





Output is :




True
False
True
False
True



• First, we have called islower() on a string of all lower case characters, hence True.
• Next, we have called islower() on a string of only digits, hence False.
• Next, islower() is called on a string of digits and lower case characters, hence True.
• Next, islower() is called on a string of lower case characters(except one), hence False.
• Next, islower() is called on a string with a mix of non-alphabetic character and lower case characters, hence True.







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