In this source code example, we will demonstrate how to use the Python string islower() method to check if all case characters are lowercase.

Use the Python string islower() method to determine if all cased characters of a string are lowercase.

Python string islower() method example

The following example uses the islower() to check if all characters of an email are lowercase:

email = 'hello@example.com'
is_lowercase = email.islower()
print(is_lowercase)

Output:

True

However, the following example returns False because the first character of the string is uppercase:

email = 'Hello@example.com'
is_lowercase = email.islower()
print(is_lowercase)

Output:

False

The following example returns False because the string has no cased characters:

email = '123@123'
is_lowercase = email.islower()
print(is_lowercase)

Output:

False

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