javascript - Python 使用多个键对 JSON 对象进行分组

Question

我有这个 JSON 对象，其结构如下(json 对象是使用 to_json(orient="records") 从 pandas 数据帧中提取的)

data = [{'month': 'Jan','date': '18','activity': 'cycling','duration': 3},
        {'month': 'Jan', 'date': '18','activity': 'reading', 'duration': 3.0},
        {'month': 'Jan', 'date': '19', 'activity': 'scripting', 'duration': 19.5},
        {'month': 'Feb','date': '18', 'activity': 'work', 'duration': 22.0 },
        {'month': 'Feb', 'date': '19', 'activity': 'cooking','duration': 0.7},
        {'month': 'March', 'date': '16', 'activity': 'hiking', 'duration': 8.0}]

我正在尝试按两个字段月份和日期进行分组预期结果:

data =  [{
            "month": "Jan",
            "details": [{
                "date": "18",
                "effort": [{
                    "activity": "cycling",
                    "duration": 3
                }, {
                    "activity": "reading",
                    "duration": 3.0
                }]
            }, {
                "date": "19",
                "effort": [{
                    "activity": "scripting",
                    "duration": 19.5
                }]
            }]
        }, {
            "month": "Feb",
            "details": [{
                "date": "18",
                "effort": [{
                    "activity": "work",
                    "duration": 22.0
                }]
            }, {
                "date": "19",
                "effort": [{
                    "activity": "cooking",
                    "duration": 0.7
                }]
            }]
        }, {
            "month": "March",
            "details": [{
                "date": "16",
                "effort": [{
                    "activity": "hiking",
                    "duration": 8.0
                }]
            }]
        }]

我尝试将数据作为 python 字典，使用 to_dict(orient="records") 从 pandas 数据帧中提取

list_ = []

for item in dict_:
    list_.append({"month" : item["month"],
                                "details":
                                [{
                                    "date" : item["date"],
                                    "efforts" : 
                                        [{
                                            "activity" : item["activity"],
                                            "duration": item["duration"]
                                        }]
                                }]
                            })

json.dumps(list_)       

我得到的输出是

[{
    "month": "Jan",
    "details": [{
        "date": "18",
        "efforts": [{
            "duration": 3,
            "activity": "cycling"
        }]
    }]
}, {
    "month": "Jan",
    "details": [{
        "date": "18",
        "efforts": [{
            "duration": 3.0,
            "activity": "reading"
        }]
    }]
}, {
    "month": "Jan",
    "details": [{
        "date": "19",
        "efforts": [{
            "duration": 19.5,
            "activity": "scripting"
        }]
    }]
}, {
    "month": "Feb",
    "details": [{
        "date": "18",
        "efforts": [{
            "duration": 22.0,
            "activity": "work"
        }]
    }]
}, {
    "month": "Feb",
    "details": [{
        "date": "19",
        "efforts": [{
            "duration": 0.7,
            "activity": "cooking"
        }]
    }]
}, {
    "month": "March",
    "details": [{
        "date": "16",
        "efforts": [{
            "duration": 8.0,
            "activity": "hiking"
        }]
    }]
}]

我不处理现有字段的值串联。

尝试使用 python 和 java 脚本，你们对这个问题有什么建议或解决方案吗？谢谢

Answer 1

这似乎有效:

代码

data = [{'month': 'Jan','date': '18','activity': 'cycling','duration': 3},
        {'month': 'Jan', 'date': '18','activity': 'reading', 'duration': 3.0},
        {'month': 'Jan', 'date': '19', 'activity': 'scripting', 'duration': 19.5},
        {'month': 'Feb','date': '18', 'activity': 'work', 'duration': 22.0 },
        {'month': 'Feb', 'date': '19', 'activity': 'cooking','duration': 0.7},
        {'month': 'March', 'date': '16', 'activity': 'hiking', 'duration': 8.0}]

new_data = []
not_found = True
for item in data:
    for month in new_data:
        not_found = True
        if item['month'] == month['month']:
            not_found = False
            for date in month['details']:
                if item['date'] == date['date']:
                    date['effort'].append({'activity':item['activity'], 'duration':item['duration']})
                else:
                    month['details'].append({'date':item['date'], 'effort':[{'activity':item['activity'], 'duration':item['duration']}]})
            break
    if not_found:
        new_data.append({'month':item['month'], 'details':[{'date':item['date'], \
            'effort':[{'activity':item['activity'], 'duration':item['duration']}]}]})

print new_data

输出

[{'details': [{'date': '18', 'effort': [{'duration': 3, 'activity': 'cycling'}, {'duration': 3.0, 'activity': 'reading'}]}, {'date': '19', 'effort': [{'duration': 19.5, 'activity': 'scripting'}, {'duration': 19.5, 'activity': 'scripting'}]}], 'month': 'Jan'}, {'details': [{'date': '18', 'effort': [{'duration': 22.0, 'activity': 'work'}]}, {'date': '19', 'effort': [{'duration': 0.7, 'activity': 'cooking'}, {'duration': 0.7, 'activity': 'cooking'}]}], 'month': 'Feb'}, {'details': [{'date': '16', 'effort': [{'duration': 8.0, 'activity': 'hiking'}]}], 'month': 'March'}]

基本上只是迭代每个条目，首先检查月份是否存在，如果存在，则检查日期是否已经存在，并相应地附加到新数据。因此，如果不存在月份，则附加所有内容；如果不存在日期，则附加日期详细信息和新事件。如果日期也存在，那么您只需附加事件