有没有办法用python编写这段代码？

我正在将一些Matlab代码翻译成python。在一个脚本中有最后一部分不断给我一个索引错误。我需要帮助来写这个脚本。当试图用python保存数据结构（类似于在Matlab中运行的脚本）时，会出现错误。错误是arr索引

MATLAB代码：

fid = fopen(fname);
scan = textscan(fid, '%f %f %f %f %f');
xx = scan{1,1};
yy = scan{1,2};
th = scan{1,3};
lx = th(1);
ly = th(1);


numsteps = xx(1); % assign number of time steps to first column of data

for tp = 1:numsteps % for loop [] every 50 time steps// range depending on data
    [na, cfa, sea] = genstep(xx, yy, th, tp, lx, ly); %input data to genstep() to obtain na, cfa, 
    sea values. (50 tp)
    arr(tp).n = na; 
    arr(tp).cf = cfa;
    arr(tp).se = sea;
end

PYTHON代码：

 def arrDisplay(self):
        file = np.loadtxt(self.fileName)
        xx = file[:, 0]
        yy = file[:, 1]
        th = file[:, 2]
        lx = file[0, 2]
        ly = file[0, 2]

        numsteps = xx[0]

        for tp in range(1, int(numsteps)):
            n, cf, se = gensteps(yy, xx, th, tp, lx, ly)
            arr = []
            arr[tp].append(n)
            arr[tp].append(cf)
            arr[tp].append(se)

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MATLAB数组从1开始，在lenarray结束，而python数组从0开始，在lenarray-1结束。