What does s in a Python format string mean

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For example, in the below code

if len(sys.argv) < 2:
     sys.exit('Usage: %s database-name' % sys.argv[0])

 if not os.path.exists(sys.argv[1]):
     sys.exit('ERROR: Database %s was not found!' % sys.argv[1])
Sep 5, 2023 in Python by Satyawrat
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