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# Python String | isupper method

schedule Aug 12, 2023
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Python
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Python's `str.isupper(~)` method returns a `boolean` indicating whether all cased characters in a string are uppercase. Note that when the string contains only special characters `False` is returned.

No parameters.

# Return value

A `boolean` indicating whether all the cased characters in a string are uppercase.

# Examples

## Basic Usage

When all the cased characters are not uppercase:

``` x = 'SkyTowner'x.isupper() False ```

When all the cased characters are uppercase:

``` y = 'SKYTOWNER'y.isupper() True ```

## Non-cased characters

When all the characters are special characters or numbers:

``` z = '123'z.isupper() False ```

When the string is a mix of special characters and uppercase characters:

``` a = '123A'a.isupper() True ```

Note that the `isupper()` method only checks whether all cased characters are uppercase and disregards non-cased characters such as numbers.

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