The expression `f' --bucket_reso_steps={kwargs.get("bucket_reso_steps", 1)}'` is an f-string, a feature in Python that allows you to embed expressions inside string literals using curly braces {}. The f-string evaluates the expression inside the curly braces and includes the result in the final string.

In this case, the expression inside the curly braces is `kwargs.get("bucket_reso_steps", 1)`, which retrieves the value associated with the key "bucket_reso_steps" from the dictionary `kwargs` or returns 1 if the key is not present. The f-string evaluates this expression and then constructs the resulting string with the format `--bucket_reso_steps=<value>`.

You can put code like this in a list because Python allows you to use expressions when creating lists. In this case, the expression is an if-else statement that evaluates to a string, which becomes an element of the list called "options".
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