[问题求助] Python如何按列取出txt文件中的数据？

file = "data.txt"
g={}

def main():
    local={"a": []}
    with open(file,"r",encoding="utf-8") as f:
        for line in f:
            row = line.strip('\n')[2:-3]  #去回车及首尾多余{},
            if row:
                items = row.split('}, {')
                local["a"].append(float(items[0].split(',')[1]))  #第1列
                for i in range(1,len(items)):  #处理第2~8列
                    item = items[i].split(',')
                    key = item[0].strip('"')
                    value = float(item[1])
                    if key not in local:
                        exec(f"{key}=[]",g,local)
                    exec(f"{key}.append({value})",g,local)
    
    for k,v in local.items():
        print(f"{k} = {v}")

if __name__ == "__main__":
    main()
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a = [600.0, 607.0, 614.0, 621.0, 628.0, 635.0, 642.0, 649.0, 656.0, 663.0, 670.0, 677.0, 684.0]
dio = [0.38072, 0.37969, 0.37865, 0.37761, 0.37656, 0.3755, 0.37445, 0.37338, 0.37232, 0.37125, 0.37019, 0.36913, 0.36806]
ksp = [0.02269, 0.0227, 0.02272, 0.02273, 0.02275, 0.02276, 0.02278, 0.0228, 0.02282, 0.02284, 0.02286, 0.02288, 0.02291]
mu = [0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519, 0.02519]
g = [0.37565, 0.37705, 0.37846, 0.37988, 0.3813, 0.38272, 0.38415, 0.38558, 0.38701, 0.38844, 0.38987, 0.3913, 0.39272]
ru = [0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787, 0.00787]
q = [0.14396, 0.14419, 0.14441, 0.14464, 0.14487, 0.14509, 0.14532, 0.14554, 0.14577, 0.14599, 0.14621, 0.14644, 0.14666]
ky = [0.0439, 0.0433, 0.04269, 0.04208, 0.04147, 0.04086, 0.04024, 0.03963, 0.03902, 0.03841, 0.0378, 0.03719, 0.03659]
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