Understanding Python String islower()

The Python islower() string method returns true if all characters of a string are in lowercase, else returns false.

• The islower() method is an in-built method for string handling.
• If all case-based characters (letters) of a string are in lowercase then this method returns true otherwise returns false.
• This method returns true for whitespace if all other characters in the given string are alphabet and in lowercase. For a string with only whitespaces, this method will return false.
• For digits and symbols, this method returns false.

Below we have a basic syntax of the islower() method in Python:

string.islower()

Note: In the above syntax string denotes the string variable on which islower() method will be applied.

Python String **islower()**: Parameters

From the syntax it is clear that this method does not take any parameters. If any parameter will be passed then it will raise an error.

Python String **islower()**: Returned Values

This method returns true if all characters of a string are in lowercase and false otherwise.

Below we have an example to show the working of String islower() function:

str="i Am Girl"
print(str.islower())

The Output will be:

false

Note: The above example's output is false because all letters are not in lowercase.

str="i am a wonderwoman"
print(str.islower())

The Output will be:

true

This tutorial covers the islower() method of strings in Python which returns true if all characters of a string are in lowercase. It returns false for digits, symbols, and whitespaces.