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Alex Rivera
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There are various string formatting methods: Python <2.6: "Hello %s" % name Python 2.6+: "Hello {}".format(name) (uses str.format ) Python 3.6+: f"{name}" (uses f-strings) Which is better, and for what situations? The following methods have the same outcome, so what is the difference? name = "Alice" "Hello %s" % name "Hello {0}".format(name) f"Hello {name}" # Using named arguments: "Hello %(kwarg)s" % {'kwarg': name} "Hello {kwarg}".format(kwarg=name) f"Hello {name}" When does string formatting run, and how do I avoid a runtime performance penalty? If you are trying to close a duplicate question that is just looking for a way to format a string, please use How do I put a variable’s value inside a string? .
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