我開始為日常任務學習python，到目前為止只遇到過簡單的檔案處理。但是今天處理大量繁重檔案的任務擺在我面前，我最終完成了。
我有一個包含以下內容的大檔案：
TRACE:1
10000.000000;-4.316597;
10050.000000;-4.686951;
10100.000000;-5.178696;
10150.000000;-4.356827;
10200.000000;-4.620125;
.....
TRACE 2:
10000.000000;-50.371719;
10050.000000;-52.572052;
10100.000000;-60.795563;
10150.000000;-50.679413;
10200.000000;-62.036072;
.....
TRACE 3:
10000.000000;-10.796394;
10050.000000;-10.879318;
10100.000000;-11.238129;
10150.000000;-10.811073;
10200.000000;-10.627502;
10250.000000;-10.825951;
10300.000000;-11.240158;
TRACE 4:
Nope;Nope;
我需要將跟蹤資料分成單獨的檔案
Input: data.DAT --> Output: Trace1.DAT, Trace2.DAT, Trace3.DAT
我試著用這種方式做
import os
os.chdir('C:\path\to\work\dir')
with open('data.DAT') as dataFile, \
open('Trace1.DAT', "w ") as T1,\
open('Trace2.DAT', "w ") as T2,\
open('Trace3.DAT', "w ") as T3:
a = []
for num, line in enumerate(dataFile, 1):
if 'TRACE 1:' in line:
a.append(num)
if 'TRACE 2:' in line:
a.append(num)
if 'TRACE 3:' in line:
a.append(num)
if 'TRACE 4:' in line:
a.append(num)
print(a)
[dataFile.readline() for _ in range(a[0], a[1])]
T1.writelines(dataFile)
[dataFile.readline() for _ in range(a[1], a[2])]
T2.writelines(dataFile)
[dataFile.readline() for _ in range(a[2], a[3])]
T3.writelines(dataFile)
我得到了 Python 輸出：
a = [42, 1999847, 3999652, 5999457]
創建的檔案：
drwxrwxrwx 1 user user 512 Jan 10 17:31 .
drwxrwxrwx 1 user user 512 Jan 10 17:31 ..
-rwxrwxrwx 1 user user 0 Jan 10 16:46 Trace1.DAT
-rwxrwxrwx 1 user user 0 Jan 10 16:47 Trace2.DAT
-rwxrwxrwx 1 user user 0 Jan 10 16:47 Trace3.DAT
-rwxrwxrwx 1 user user 173082112 Jan 11 2019 data.DAT
感謝您的幫助或建議
uj5u.com熱心網友回復：
你可以試試：
with open('data.DAT') as inp:
out = None
for line in inp:
if line.startswith('TRACE'):
if out != None:
out.close()
filename = f"Trace{line.split()[1][:-1]}.DAT"
out = open(filename, 'w')
else:
out.write(line)
out.close()
uj5u.com熱心網友回復：
有點冗長但有效:)
使用 open('data.DAT', 'r') 作為檔案閱讀器：
read = filereader.readlines()
traceOne = None
TraceTwo = None
TraceThree = None
for i in read:
if i.startswith("TRACE:1"):
traceOne = read.index(i)
elif i.startswith("TRACE 2:"):
TraceTwo = read.index(i)
elif i.startswith("TRACE 3:"):
TraceThree = read.index(i)
else:
continue
with open('TRACE1.DAT', 'w ') as writeTraceONE:
traceonefile = writeTraceONE.writelines("\n".join(read[traceOne:TraceTwo]))
with open('TRACE2.DAT', 'w ') as writeTraceTwo:
tracetwofile = writeTraceTwo.writelines("\n".join(read[TraceTwo:TraceThree]))
with open('TRACE3.DAT', 'w ') as writeTraceThree:
traceThreeFile = writeTraceThree.writelines("\n".join(read[TraceThree:]))
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