仅将特定行从文件 a 写入文件 b

Question

我在只将感兴趣的行写入新文件时遇到问题。

f1文件由raws组成，内容如下：

line =
'Raw,512561008,58913000000,,,-1226439751087359050,0.0,6.748478024207768,,,0,14,0.0,16397,510195928489024,10,33.76073455810547,91.65148631320972,0.0037611895240843296,1,6907.217495186118,0.0018805947620421648,1.56109798E9,,,,0,,5,,1.56109798E9'

我有兴趣编写索引 [-15:-14] 之间不包含“5”的行。我已经编写了以下函数，但是当我运行它时，新文件仍然包含不需要的行。如果有人能指出我做错了什么，我将不胜感激。谢谢！

def CleanGNSSLogger(ASCIIfileName,filterStr=None):
   try:
      with open(ASCIIfileName, 'r') as f1, open(ASCIIfileName[:-4]+'_clean'+ASCIIfileName[-4:],'w') as f2:
          for line in f1:
              if line[-15:-14] != '5':
                  f2.write(line)
   except IOError as e:
      print ('Operation failed: %s' % e.strerror)

   return

Answer 1

尝试

if "5" not in line[-15:-14]:

看看这是否有效。

Answer 2

我会做这样的事情，所以你要确保你感兴趣的值 (5) 是可访问的：

SOME_NAME_INDEX = 29 # or the correct location of the value of interest

def CleanGNSSLogger(ASCIIfileName,filterStr=None):
    try:
        with open(ASCIIfileName, 'r') as f1, open(ASCIIfileName[:-4]+'_clean'+ASCIIfileName[-4:],'w') as f2:
            for line in f1:
                values = line.split(",")
                if values[SOME_NAME_INDEX] != '5':
                    f2.write(line)
    except IOError as e:
        print ('Operation failed: %s' % e.strerror)

仅将特定行从文件 a 写入文件 b

write only specific lines from file a to file b

python

string

file

new-operator