在python中将数据序列化为JSON

Question

有人能给我一些指导，如何将数据序列化成类似下面所示的文件？在

{
  "minShift": -0.5,
  "maxShift": 0.5,
  "stepShift": 0.002,
  "feeds": {
    "CFH": "CFH_20140318T0900.txt",
    "LMAX": "LMAX_20140318T0900.txt",
    "Saxo": "Saxo_20140318T0900.txt"
  },
  "instruments": [
      {
        "instrument_old": "CFH/EURUSD",
        "instrument_new": "LMAX/EURUSD"
      },
      {
        "instrument_old": "CFH/EURUSD",
        "instrument_new": "Saxo/EURUSD" 
      },
      {
        "instrument_old": "LMAX/XAUUSD",
        "instrument_new": "Saxo/XAUUSD" 
      }
  ]
}

我有：

• 包含三个元素的shiftData列表（用于min、max和stepShift）
• 字典键：值=>；{提供者名称：文件名}
• 名为instrumentPairList的两个元素列表的列表[新的仪器，旧的仪器]

我不想让任何人来解决我的任务，但是在Python中关于JSON的各种教程都相当模糊或简单：

• http://pymotw.com/2/json/
• https://python.readthedocs.org/en/v2.7.2/library/json.html
• http://freepythontips.wordpress.com/2013/08/08/storing-and-loading-data-with-json/
• Python dump dict to json file
• http://www.anthonydebarros.com/2012/03/11/generate-json-from-sql-using-python/

它正在尝试序列化minShift、maxShift、stepShift和feeds：

^{pr2}$

Answer 1

我的解决方案是：

data = { "minShift":shiftData[0],"maxShift":shiftData[1],"stepShift":shiftData[2],
          "feeds":providerAliases,
           "instruments":[ {"instrument_old":pair[0],"instrument_new":pair[1]}
                            for pair in instrumentPairList ]}
data_string = json.dumps(data, indent=4)

file = open(dir+r"\config.json","w")
file.write(data_string)
file.close()