读取从文本文件到字典python的所有行

Question

Here I have a function that, when I read, only returns the last line. What am I doing wrong?

def read():
    with open("text.txt","r") as text:
        return dict(line.strip().split() for line in text)

The text file is pretty simple, two columns

asd 209
asd 441
asd 811
asd 160
asd 158

I want to read all the times into a dictionary, the asd part as the keys and the numbers as the value.

Answer 1

Dictionary keys must be unique. You have only one unique key in that file.

You are in essence assigning different values to the same key, and only the last value is visible as the previous values are overwritten:

>>> d = {}
>>> d['asd'] = 209
>>> d['asd'] = 441
>>> d
{'asd': 441}

To store the largest value, use:

def read():
    res = {}
    with open("text.txt","r") as text:
        for line in text:
            key, value = line.split()
            if int(value) > res.get(key, -1):
                res[key] = int(value)
    return res

Answer 2

To append values into a list for each dictionary key you can use a defaultdict

from collections import defaultdict

def read():
    result = defaultdict(list)
    with open("text.txt","r") as text:
        for line in text:
            key, value = line.strip().split()
            result[key].append(value)
    return result