Python从文件中提取数据 [英] Python to extract data from a file

问题描述

  ---- 
 data1我试图提取具有特定文本文件的文本：
 
 data1 
 data1 
 extractme 
 ---- 
 data2 
 data2 
 data2 
 ---- 
 data3 
 data3 
 extractme 
 ---- 
  

然后将其转储到文本文件中，以便

  ---- 
 data1 
 data1 
 data1 
 extractme 
 --- 
 data3 
 data3 
 extractme 
 --- 
   
 
 
感谢您的帮助。
 
解决方案
您的示例数据在一个名为data.txt的文件中，输出到result.txt。
 
 $ p $  inFile = open （data.txt）
 outFile = open（result.txt，w）
 buffer = [] 
 keepCurrentSet = True 
 inFile：
 buffer.append（line）
如果line.startswith（----）：
＃----开始一个新的数据集
如果keepCurrentSet：
 outFile.write（。join（buffer））
 #now重置我们的状态
 keepCurrentSet = False 
 buffer = [] 
 elif line.startswith（extractme） ：
 keepCurrentSet = True 
 inFile.close（）
 outFile.close（）
  

I am trying to extract the text between that has specific text file:

----
data1
data1
data1
extractme
----
data2
data2
data2
----
data3
data3
extractme
----

and then dump it to text file so that

----
data1
data1
data1
extractme
---
data3
data3
extractme
---

Thanks for the help.

解决方案

This works well enough for me. Your sample data is in a file called "data.txt" and the output goes to "result.txt"

inFile = open("data.txt")
outFile = open("result.txt", "w")
buffer = []
keepCurrentSet = True
for line in inFile:
    buffer.append(line)
    if line.startswith("----"):
        #---- starts a new data set
        if keepCurrentSet:
            outFile.write("".join(buffer))
        #now reset our state
        keepCurrentSet = False
        buffer = []
    elif line.startswith("extractme"):
        keepCurrentSet = True
inFile.close()
outFile.close()

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