如何使用管道定界符将值附加到python中的相同键

Question

I'm reading a text file which I will convert into array of (key,pairs). I want to append the values if I have same key with pipe delimiter. I'm new to python, can someone please help me to fix this issue. Please find my code and input and output format:

File Input: (test.txt)

1234567 E29dceffb-28bd-4f05-b91f-03f05510c081,0743,438864,10/06/2016,7,IK,PP,7136977,,4,37791,,,,01/11/2017
83738383 E29dceffb-38373-3839-8393-83038383,0743,438864,10/06/2016,7,PO,VC,4,37791,,,,01/11/2017
1234567 E29dceffb-38DFG3-4f05-0393-39303933,1234,78789,10/06/2016,7,LL,YY,7136977,,4,37791,,,01/10/2017

Python code:

import sys

with open('test.txt') as f:
  result = dict(line.split(' ', 1) for line in f)
  for line in list:
    if line[0] in result:
        result[line[0]].append(line[1])
    else:
        result[line[0]] = [line[1]]

I want to print my key and value like below:

Key: 1234567.AB.K
Value: E29dceffb-28bd-4f05-b91f-03f05510c081,0743,438864,10/06/2016,7,IK,PP,7136977,,4,37791,,,,01/11/2017|E29dceffb-38DFG3-4f05-0393-39303933,1234,78789,10/06/2016,7,LL,YY,7136977,,4,37791,,,01/10/2017|

Key: 83738383.AB.K
Value: E29dceffb-38373-3839-8393-83038383,0743,438864,10/06/2016,7,PO,VC,4,37791,,,,01/11/2017|

Using pipe delimiter if more than one value occurs for same key to differentiate first record, second record and so on.

I'll be getting around 2 millions of entry in test.txt file.

How efficiently I can handle this in python. My python script is not working as expected its breaking the code if i try to append the value for same key.

Any help is very much appreciated! Thanks in advance.

Answer 1

I'm not sure about your list on that for loop.

The reason your code break when you try to append the value for same key is because you create result as dictionary with each value being a single string.

What you need is to create a result_dict for your final result, something like this

result_dict = {}

with open('test.txt') as f:
  lines = list(line.split(' ', 1) for line in f)
  for line in lines:
    if line[0] in result_dict:
        result_dict[line[0]].append(line[1].strip())
    else:
        result_dict[line[0]] = [line[1].strip()]

print(result_dict)

will print

{'1234567.AB.K': ['E29dceffb-28bd-4f05-b91f-03f05510c081,0743,438864,10/06/2016,7,IK,PP,7136977,,4,37791,,,,01/11/2017', 'E29dceffb-38DFG3-4f05-0393-39303933,1234,78789,10/06/2016,7,LL,YY,7136977,,4,37791,,,01/10/2017'], '83738383.AB.K': ['E29dceffb-38373-3839-8393-83038383,0743,438864,10/06/2016,7,PO,VC,4,37791,,,,01/11/2017']}