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  • python读取文件csv,先按第4列排序,再按第5列的数值排序

    插入代码:

    from operator import itemgetter
    
    input_file = open("PDBhaemoglobinReport.csv")
    output_file = open("PDBhaemoglobinSorted.csv","w")
    
    table = []
    header = input_file.readline() #读取并弹出第一行
    for line in input_file:
        col = line.split(',') #每行分隔为列表,好处理列格式
        col[3] = float(col[3][1:-1])
        col[4] = int(col[4][1:-2]) #各行没有先strip 末位是
    
        table.append(col) #嵌套列表table[[8,8][*,*],...]
    
    table_sorted = sorted(table, key=itemgetter(3, 4))#先后按列索引3,4排序
    
    output_file.write(header + '	')
    for row in table_sorted:                    #遍历读取排序后的嵌套列表
        row = [str(x) for x in row]             #转换为字符串格式,好写入文本
        output_file.write("	".join(row) + '
    ')
    
    input_file.close()
    output_file.close()

    附:

    PDBhaemoglobinReportcsv内容

    PDB ID,Chain ID,Exp. Method,Resolution,Chain Length
    "1A4F","A","X-RAY DIFFRACTION","2.00","141"
    "1C7C","A","X-RAY DIFFRACTION","1.80","283"
    "1CG5","A","X-RAY DIFFRACTION","1.60","141"
    "1FAW","A","X-RAY DIFFRACTION","3.09","141"
    "1HDA","A","X-RAY DIFFRACTION","2.20","141"
    "1IRD","A","X-RAY DIFFRACTION","1.25","141"
    "1KFR","A","X-RAY DIFFRACTION","1.85","147"
    "1QPW","A","X-RAY DIFFRACTION","1.80","141"
    "1SPG","A","X-RAY DIFFRACTION","1.95","144"
    "1UX8","A","X-RAY DIFFRACTION","2.15","132"

    PDBhaemoglobinSorted.csv :

    PDB ID,Chain ID,Exp. Method,Resolution,Chain Length
    "2W72" "A" "X-RAY DIFFRACTION" 1.07 141
    "1IRD" "A" "X-RAY DIFFRACTION" 1.25 141
    "2H8F" "A" "X-RAY DIFFRACTION" 1.3 143
    "2WY4" "A" "X-RAY DIFFRACTION" 1.35 140
    "2D5X" "A" "X-RAY DIFFRACTION" 1.45 141
    "4ESA" "A" "X-RAY DIFFRACTION" 1.45 143
    "3VRG" "A" "X-RAY DIFFRACTION" 1.5 141
    "1CG5" "A" "X-RAY DIFFRACTION" 1.6 141
    "4HBI" "A" "X-RAY DIFFRACTION" 1.6 146
    "1QPW" "A" "X-RAY DIFFRACTION" 1.8 141

    本文来自博客园,作者:BioinformaticsMaster,转载请注明原文链接:https://www.cnblogs.com/koujiaodahan/p/8047109.html

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  • 原文地址:https://www.cnblogs.com/koujiaodahan/p/8047109.html
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