Converting a file into a dictionary with one key and multiple values

Question

I have a data file that looks like this:

I want to make the first column into a key and the values that come after the key into values of a dictionary.

This is the code I used but it didn't give me what I wanted.

with open('data.txt', 'r') as f:
    ...: 
    ...:     for line in f:
    ...:         items = line.split()
    ...:         key, values = items[0], items[1:]
    ...:         my_dict[int(key)] = values

Answer 1

Assuming you're trying to concatenate additional values from lines with the same key instead of overwriting them, you could use:

for line in f:
    items = line.split()
    key, values = int(items[0]), items[1:]
    my_dict.setdefault(key, []).extend(values)