[英]Python: How to dynamically write to multiple files
我順序記錄來自多個流的數據包。 根據每個數據包中的數據,我需要將數據寫入特定的日志文件。 我將一次最多打開8個文件以滿足最多8個並發數據流日志文件在新數據流的開始和結束時打開和關閉。
我已經提出以下代碼來處理寫操作。
#Identify where the data needs to be stored
filePointer = unpack_from('!B',payload, 4)
#Grab the data
capData = unpack_from('!160s', payload, 10)
#Store the data
if filePointer[0] == 1: Logfile1.write(str(capData[0]))
elif filePointer[0] == 2: Logfile2.write(str(capData[0]))
elif filePointer[0] == 3: Logfile3.write(str(capData[0]))
elif filePointer[0] == 4: Logfile4.write(str(capData[0]))
elif filePointer[0] == 5: Logfile5.write(str(capData[0]))
elif filePointer[0] == 6: Logfile6.write(str(capData[0]))
elif filePointer[0] == 7: Logfile7.write(str(capData[0]))
elif filePointer[0] == 8: Logfile8.write(str(capData[0]))
有沒有更好的pythony方式來做到這一點?
變量可以以某種方式用於組成文件句柄或返回所需的文件句柄嗎?
干杯
POB
您可以構建文件列表字典並使用它來動態選擇文件:
d = {1: Logfile1, 2: Logfile2, ...}
curr_file = d[filePointer[0]]
curr_file.write(str(capData[0]))
你可以使用一個列表,比如說“logfiles”來存儲你的“logfileN”文件對象。
或者dict,代碼示例:
logfiles = {}
for i in range(1, 9):
logfiles[i] = open("Mylog_%s.log"%(i,), "w")
for filePointer, capData in yourLoop:
logfiles[filePointer[0]].write(str(capData[0]))
(根據需要添加錯誤控制)
使用dict,將filePointer [0]映射到logfile
我認為pythonic方式是這樣的:
logFileHandlers = {
1: Logfile1,
2: Logfile2,
3: Logfile3,
4: Logfile4,
5: Logfile5,
6: Logfile6,
7: Logfile7,
8: Logfile8,
}
try:
fileHandler = logFileHandlers[filePointer[0]]
fileHandler.write(str(capData[0]))
except KeyError as e:
print e # handle exception: unrecognized data from stream
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