Python会将id相同但值不同的术语附加到列表中吗？

Question

我有一个csv文件，其中有一般概念和相应的医学术语或短语。如何编写循环，以便将所有短语分组到相应的概念中？我对python不是很有经验，所以我不确定如何编写循环

id   concept           phrase
--------------------------------
1    general_history   H&P
1    general_history   history and physical
1    general_history   history physical
2    clinic_history    clinic history physical
2    clinic_history    outpatient h p
3    discharge         discharge summary
3    discharge         DCS

对于相同的概念术语（或相同的ID），如何将短语附加到列表中以获得如下内容：

var = [[general_history, ['history and physical', history physical]], 
       [clinic_history, ['clinic history physical', 'outpatient h p']], 
       [discharge, ['discharge summary', 'DCS']]]

Answer 1

使用for循环to和defaultdict累积术语

import csv
from collections import defaultdict
var = defaultdict(list)
records = ...  # read csv with csv.DictReader
for row in records:
    concept = row.get('concept', None)
    if concept is None: continue
    phrase = row.get('phrase', None)
    if phrase is None: continue
    var[concept].append(phrase)
print(var)