計算環蟒蛇得分文件

用下面的學生的分數文件，我將如何加載數據，並在Python總結score1，score3？

{"id": "1","student":"John", "dt": "1997-01-01 07:00:02", "score1": "38.28"} 
{"id": "2", "student":"Jane", "dt": "1997-01-01 07:00:02", "score1": "32.35"} 
{"id": "3", "student":"Richard", "dt": "1997-01-10 10:00:00", "score3": "22.92"}

輸出：

score1: 70.63 
score3: 22.92

來源

2017-06-29 xerlil

到目前爲止您嘗試了什麼？ –

有很多方法可以解決這個問題，你需要一個非常具體的實現，試着問一個更加尖銳的問題，比如「如何將文本文件讀入python」（儘管它已經有了答案：https： //stackoverflow.com/questions/14676265/how-to-read-text-file-into-a-list-or-array-with-python#14676357）。你希望他們如何閱讀？只是分數還是你想要所有的數據？你對格式有什麼瞭解？ –

顯然通過調用'get_stackoverflow_to_do_all_my_homework（）' – donkopotamus

file.txt的：

{"id": "1","student":"John", "dt": "1997-01-01 07:00:02", "score1": "38.28"} 
{"id": "2", "student":"Jane", "dt": "1997-01-01 07:00:02", "score1": "32.35"} 
{"id": "3", "student":"Richard", "dt": "1997-01-10 10:00:00", "score3": "22.92"}

務必：

import json 

scores = dict() 
with open('file.txt') as filename: 
    for line in filename.readlines(): 
     data = json.loads(line) 
     score = [key for key in data.keys() if key.startswith('score')] 
     if len(score) == 0: 
      continue 
     score = score[0] 
     if score not in scores: 
      scores[score] = 0 
     scores[score] += float(data[score]) 

for k, v in scores.items(): 
    print('{}: {}'.format(k, v))

輸出繼電器：

score1: 70.63 
score3: 22.92

來源

2017-06-29 01:13:25 glegoux

使用內置庫json您可以將JSON解碼爲Python對象。如果使用這樣的數據：

[ 
    {"id": "1","student":"John", "dt": "1997-01-01 07:00:02", "score1": "38.28"}, 
    {"id": "2", "student":"Jane", "dt": "1997-01-01 07:00:02", "score1": "32.35"}, 
    {"id": "3", "student":"Richard", "dt": "1997-01-10 10:00:00", "score3": "22.92"} 
]

注中的數據[...]和,所以它加載的列表。

然後下面的腳本可以完成這項工作。

import json 
from math import fsum 

data = json.load(open("data.json")) # Load the data 
sums = {} 
for person in data: # Loop over pieces of data 
    # Add any names starting with "score" to sums 
    for key in person.keys(): # Loop over names 
     if not key[:5] == "score": 
      continue # No, not starting with score, skip it 
     # Use math.fsum to add the value known to the score, and set it. 
     sums[key] = fsum([sums.get(key, 0.0), float(person[key])]) 
for k, v in sums.items(): 
    # Print out the data 
    print("%s: %.02f" % (k, v))

我在評論中添加了解釋。在IDLE 3.6.1中測試。

來源

2017-06-29 01:43:13

計算環蟒蛇得分文件

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