在Snakemake中可以有“可选的”通配符或文件名的一部分吗？

rule process_with_wildcard:
    input:
        "data/{sample}.txt"
    output:
        "results/{sample}_processed.txt"
    shell:
        "process_data.sh {input} {output}"

rule process_without_wildcard:
    input:
        "data/default.txt"
    output:
        "results/default_processed.txt"
    shell:
        "process_data.sh {input} {output}"

wildcard = "sample" if config["use_wildcard"] else None

rule process_data:
    input:
        "data/{wildcard}.txt" if wildcard else "data/default.txt"
    output:
        "results/{wildcard}_processed.txt" if wildcard else "results/default_processed.txt"
    shell:
        "process_data.sh {input} {output}"