在字典中制作字典以将数据按一列中的相同值分隔，然后从第二列中分隔

我是 Python 的新手，现在我被一个问题困住了几天。我做了一个脚本：

- 从 CSV 文件中获取数据 - 按数据文件第一列中的相同值对其进行排序 - 在不同模板文本文件的特定字段行中插入排序的数据 - 将文件保存在尽可能多的副本中，因为数据文件中的第一列中有不同的值下图显示了它是如何工作的：

But there are two more things I need to do. When in separate files as showed above, there are some of the same values from second column of the data file, then this file should insert value from third column instead of repeating the same value from second column. On the picture below I showed how it should look like:

What I also need is to add somewhere separeted value of first column from data file by "_".

There is datafile:

111_0,3005,QWE
111_0,3006,SDE
111_0,3006,LFR
111_1,3005,QWE
111_1,5345,JTR
112_0,3103,JPP
112_0,3343,PDK 
113_0,2137,TRE
113_0,2137,OMG

and there is code i made:

import shutil

with open("data.csv") as f:
    contents = f.read()
    contents = contents.splitlines()

values_per_baseline = dict()

for line in contents:
    key = line.split(',')[0]
    values = line.split(',')[1:]
    if key not in values_per_baseline:
        values_per_baseline[key] = []
    values_per_baseline[key].append(values)

for file in values_per_baseline.keys():
    x = 3
    shutil.copyfile("of.txt", (f"of_%s.txt" % file))
    filename = f"of_%s.txt" % file
    for values in values_per_baseline[file]:
        with open(filename, "r") as f:
            contents = f.readlines()
            contents.insert(x, '      o = ' + values[0] + '\n          ' + 'a = ' + values[1] +'\n')
        with open(filename, "w") as f:
            contents = "".join(contents)
            f.write(contents)
            f.close()

I have been trying to make something like a dictionary of dictionaries of lists but I can't implement it in correct way to make it works. Any help or suggestion will be much appreciated.