In Python, a string with `f` or `F` before the opening quotation mark is a **"formatted string literal"** or **f-string**, which evaluates expressions inside curly braces (`{` and `}`) within the string, substituting them into the final, formatted string.

In this case, because `kwargs.get("bucket_reso_steps", 1)` is within curly braces, the value for `bucket_reso_steps` (defaulting to `1`) will be included in the string. For example, if `bucket_reso_steps` is `5`, the resulting string will be `--bucket_reso_steps=5`. This will allow the parameter's value to be passed to the training program as a command-line.

In Python, expressions will be evaluated inside a list definition. In this case, the `if ... else` is actually a *ternary conditional*, meaning that it is evaluated as an operator in the expression. For example, just as you can use `a = [1+2]` to define a list `a` with the value `[3]`, you can use `a = [1 if True else 2]` to define it with the value `[2]`. Note: this is in contrast to a normal `if:` block, which requires multiple lines with indentation and can contain much longer code.
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