Snakemake：修剪包装器属性错误

如何解决Snakemake：修剪包装器属性错误

我有一个看起来像这样的蛇形管道：

configfile: "./config.yaml"
IN_DIR = config["in_dir"]
SAMPLES = config["samples"]

rule all:
    input: 
        expand("{sample}_Aligned.sortedByCoord.out.bam",sample=SAMPLES)

rule trimmomatic_pe:
    message:
        """
        Pre-processing raw reads with trimmomatic. Trimming low quality reads and adapter sequences. Running QC on trimmed reads.
        """
    input:
        r1 = expand("{in_dir}/{{sample}}_R1_001.fastq.gz",in_dir=IN_DIR),r2 = expand("{in_dir}/{{sample}}_R2_001.fastq.gz",in_dir=IN_DIR)
    params:
        trimmer = config["parameters"]["trim"],extra = ""
    output:
        r1 = "tmp/{sample}_R1_trimmed.fastq.gz",r2 = "tmp/{sample}_R2_trimmed.fastq.gz",r1_unpaired = "tmp/{sample}_R1_unpaired_trimmed.fastq.gz",r2_unpaired = "tmp/{sample}_R2_unpaired_trimmed.fastq.gz"
    threads:
        2
    wrapper:
        "0.74.0/bio/trimmomatic/pe"

rule map_reads:
    message:
        """
        Mapping trimmed reads to host genome
        """
    input:
        r1 = "tmp/{sample}_R1_trimmed.fastq.gz",r2 = "tmp/{sample}_R2_trimmed.fastq.gz"
    params:
        annotation = config["annotation_file"]
    output:
        "{sample}_Aligned.sortedByCoord.out.bam"
    shell:
        """
        STAR \
            --runThreadN 16 \
            --sjdbGTFfile {params.annotation} \
            --sjdbOverhang 149 \
            --outFilterType BySJout \
            --outFilterMultimapNmax 10 \
            --alignSJoverhangMin 5 \
            --alignSJDBoverhangMin 1 \
            --outFilterMismatchNmax 999 \
            --outFilterMismatchNoverReadLmax 0.04 \
            --alignIntronMin 20 \
            --alignIntronMax 1000000 \
            --alignMatesGapMax 1000000 \
            --outFilterIntronMotifs RemoveNoncanonicalUnannotated \
            --outFileNamePrefix {wildcards.sample}_ \
            --outSAMtype BAM SortedByCoordinate \
            --runMode alignReads \
            --genomeDir ./index \
            --readFilesIn {input.r1} {input.r2}
        """

当我运行 snakemake -np 时，DAG 已正确生成，但是当我尝试使用 snakemake --cores 2 实际运行管道时，我不断收到此错误，我不知道如何解释：

[Thu Apr 29 15:12:21 2021]
Job 1: 
        Pre-processing raw reads with trimmomatic. Trimming low quality reads and adapter sequences. Running QC on trimmed reads.
        

Traceback (most recent call last):
  File "/Users/user/Documents/postdoc_projects/invert/.snakemake/scripts/tmp7yzyzwru.wrapper.py",line 88,in <module>
    input_files,output_files,snakemake.threads
  File "/Users/user/Documents/postdoc_projects/invert/.snakemake/scripts/tmp7yzyzwru.wrapper.py",line 27,in distribute_threads
    gzipped_input_files = sum(1 for file in input_files if file.endswith(".gz"))
  File "/Users/user/Documents/postdoc_projects/invert/.snakemake/scripts/tmp7yzyzwru.wrapper.py",in <genexpr>
    gzipped_input_files = sum(1 for file in input_files if file.endswith(".gz"))
AttributeError: 'Namedlist' object has no attribute 'endswith'
[Thu Apr 29 15:12:22 2021]
Error in rule trimmomatic_pe:
    jobid: 1
    output: tmp/4_12hr_Ciliated_4_S4_R1_trimmed.fastq.gz,tmp/4_12hr_Ciliated_4_S4_R2_trimmed.fastq.gz,tmp/4_12hr_Ciliated_4_S4_R1_unpaired_trimmed.fastq.gz,tmp/4_12hr_Ciliated_4_S4_R2_unpaired_trimmed.fastq.gz

RuleException:
CalledProcessError in line 29 of /Users/user/Documents/postdoc_projects/invert/Snakefile:
Command 'set -euo pipefail;  /Users/user/opt/miniconda3/envs/invert/bin/python3.6 /Users/user/Documents/postdoc_projects/invert/.snakemake/scripts/tmp7yzyzwru.wrapper.py' returned non-zero exit status 1.
  File "/Users/user/Documents/postdoc_projects/invert/Snakefile",line 29,in __rule_trimmomatic_pe
  File "/Users/user/opt/miniconda3/envs/invert/lib/python3.6/concurrent/futures/thread.py",line 56,in run
Shutting down,this might take some time.
Exiting because a job execution failed. Look above for error message

管道是否没有正确识别我的样本？属性错误似乎就是这种情况，但这是我的配置文件结构：

in_dir: data #Directory containing raw fastq files from RNAseq
samples: "4_12hr_Ciliated_4_S4" #sample name prefix
annotation_file: ref_files/Homo_sapiens.GRCh38.103.gtf #Directory containing the viral host genome annotation in .gtf format

parameters:
  trim: ["TRAILING:3 ILLUMINACLIP:ref_files/TruSeq3-PE-2.fa"] #trimmomatic parameters

我错过了什么？

解决方法

expand 函数返回一个列表。通过将输入文件设置为列表而不是字符串，您会混淆脚本。为了定义 r1 和 r2，您应该使用返回字符串的东西。我建议使用字符串的 format() 函数或 f 字符串。

变化：

r1 = expand("{in_dir}/{{sample}}_R1_001.fastq.gz",in_dir=IN_DIR),

到：

r1 = "{in_dir}/{{sample}}_R1_001.fastq.gz".format(in_dir=IN_DIR),

甚至：

r1 = f"{IN_DIR}/{{sample}}_R1_001.fastq.gz",

...对 r2 做同样的事情