bytearray.islower()
Return true if there is at least one lowercase ASCII character in the sequence and no uppercase ASCII characters, false otherwise.
For example:
>>> b'hello world'.islower() True >>> b'Hello world'.islower() False
Lowercase ASCII characters are those byte values in the sequence b'abcdefghijklmnopqrstuvwxyz'. Uppercase ASCII characters are those byte values in the sequence b'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
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