An expression whose value is true if all the letters in the str associated with s are all lower case is s.islower()
The term "expression" is a term that connote a computer program statement that examines to some specific value.
Note that A Boolean expression can examine to either true or false, e.g. ( money > 100 ).
Hence, An expression whose value is true if all the letters in the str associated with s are all lower case is s.islower()
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