Syntax improvment

Hello,

Here is a proposal from python :

/home/julien/.bin/lizzy:869: SyntaxWarning: "is not" with a literal. Did you mean "!="? if not key.startswith(('^', 'KEY_')) and key is not ' ': /home/julien/.bin/lizzy:954: SyntaxWarning: "is not" with a literal. Did you mean "!="? elif not key.startswith(('^', 'KEY_')) and key is not ' ':

Like a lot Lizzy player.

Best wishes,

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