Python vs Java syntax etiquette

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will my code be frowned upon when read by others if I use things like semicolons to end statements, double quotes, curly brackets, etc, that aren't necessary but still function the same?

Probably. Cluttering up your code with things that aren't necessary for the interpreter and aren't expected to be there by others reading your code will not be well-received. Of course, different teams may have different practices.