[英]How to write several previous lines from a current line in a file using python
如何從文件中的當前行抓取/寫入前幾行? 例如在下面的文本中:...
Line 0: DATE
Line 1:
Line 2:
Line 3:
Line 4:
Line 5:
Line 6: Phase=WATER
Line 7:
Line 8:
Line 9:
Line 10:
Line 11:
...
我目前正在使用下面的腳本寫出感興趣的行和上一行,但想擴展它以抓取/寫入“Phase =”上方的 5 行:
...
prevline=""
for line in infile:
if 'DATE' in line:
macfile.write(line)
elif 'Line7' in line:
macfile.write(prevline)
macfile.write(line)
macfile.write("}""\n")
elif 'Line10' in line:
macfile.write(prevline)
macfile.write(line)
macfile.write("}""\n")
prevline=line
...
更快的方法是:
lines = infile.read()
macfile.write(lines.split("Phase=WATER")[0])
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