[英]How can I extract two specific numbers from multiple line of a text file in python
I have a very large text file that has say, latitude measurements from 2 GPS antennas. 我有一个非常大的文本文件,其中包含从2个GPS天线进行的纬度测量。 There is a lot of garbage data in the file, and I need to extract the latitude measurements from it.
文件中有很多垃圾数据,我需要从中提取纬度测量值。 These always occur occasionally in between other lines of other text.
这些总是偶尔在其他文本的其他行之间发生。 The line in which they occur looks like:
它们发生的行如下所示:
12:34:56.789 78:90:12.123123123 BLAH_BLAH blahblah : LAT #1 MEAS=-80[deg], LAT #2 MEAS=-110[deg] blah_BlHaBKBjFkjsa.c
The numbers that I need are the ones between " LAT #1 MEAS=-80[deg]
" and " LAT #2 MEAS=-110[deg]
". 我需要的数字是“
LAT #1 MEAS=-80[deg]
”和“ LAT #2 MEAS=-110[deg]
”之间的数字。 So, basically -80
and -110
. 因此,基本上是
-80
和-110
。
The remaining text is not important for me. 剩下的文字对我来说并不重要。
Here is a sample text from the input file: 这是来自输入文件的示例文本:
08:59:07.603 08:59:05.798816 PAL_PARR_INTF TraceModule GET int@HISR :82 drv_Shm.c (../../../PALCommon/Platform_EV/HAL/Common/driver/Shm/src) 525
08:59:07.603 08:59:05.798816 PAL_PARR_INTF TraceModule xdma is not running drv_Shm.c (../../../PALCommon/Platform_EV/HAL/Common/driver/Shm/src) 316
08:59:07.603 08:59:05.798847 PAL_PARR_INTF TraceModule DMA is activated drv_Shm.c (../../../PALCommon/Platform_EV/HAL/Common/driver/Shm/src) 461
08:59:10.847 08:59:09.588001 UHAL_SRCH TraceFlow : LAT #1 MEAS=-80[deg], LAT #2 MEAS=-110[deg] uhal_CHmcpPschMultiPath.c (../../../HEDGE/UL1/UHAL_3XX/Searcher/Code/Src) 1596
08:59:11.440 08:59:10.876819 UHAL_COMMON TraceWarning cellRtgSlot=0 cellRtgChip=1500 CELLK_ACTIVE=1 boundary RSN 232482 current RSN 232482 boundarySFN 508 currentSFN 508 uhal_Hmcp.c (../../../HEDGE/UL1/UHAL_3XX/platform/Code/Src) 2224
08:59:11.440 08:59:10.877277 UHAL_SRCH TraceWarning uhal_HmcpSearcherS1LISR: status_reg(0xf0100000) uhal_CHmcpPschMultiPath.c (../../../HEDGE/UL1/UHAL_3XX/Searcher/Code/Src) 1497
08:59:11.440 08:59:10.877307 UHAL_COMMON TraceWarning uhal_HmcpSearcherSCDLISR is called. uhal_CHmcpPschMultiPath.c (../../../HEDGE/UL1/UHAL_3XX/Searcher/Code/Src) 1512
08:59:11.440 08:59:10.877338 UHAL_SRCH TraceFlow : LAT #1 MEAS=-78[deg], LAT #2 MEAS=-110[deg] uhal_CHmcpPschMultiPath.c (../../../HEDGE/UL1/UHAL_3XX/Searcher/Code/Src) 1596
Now, i am using the code to open the file and get these values but it doesn't work. 现在,我正在使用代码打开文件并获取这些值,但是它不起作用。 I am new to programming, so I have no idea where I'm going wrong here.
我是编程新手,所以我不知道我在哪里出错。
import re
# Importing 're' for using regular expressions
file_dir=raw_input('Enter the complete Directory of the file (eg c:\\abc.txt):') # Providing the user with a choice to open their file in .txt format
with open(file_dir, 'r') as f:
lat_lines= f.read() # storing the data in a variable
# Declaring the two lists to hold the numbers
raw_lat1 = []
raw_lat2 = []
start_1 = 'LAT #1 MEAS='
end_1 = '[de'
start_2 = 'LAT #2 MEAS='
end_2 = '[de'
x = re.findall(r'start_1(.*?)end_1',lat_lines,re.DOTALL)
raw_lat1.append(x)
y = re.findall(r'start_2(.*?)end_2',lat_lines,re.DOTALL)
raw_lat2.append(y)
This should do it (it doesn't use a regex, but it'll still work) 这应该可以做到(它不使用正则表达式,但仍然可以使用)
answer = []
with open('file.txt') as infile:
for line in infile:
if "LAT #1 MEAS=" not in line: continue
if "LAT #2 MEAS=" not in line: continue
splits = line.split('=')
temp = [0,0]
for i,part in enumerate(splits):
if part.endswith("LAT #1 MEAS"): temp[0] = int(splits[i+1].split(None,1)[0].split('[',1)[0])
elif part.endswith("LAT #2 MEAS"): temp[1] = int(splits[i+1].split(None,1)[0].split('[',1)[0])
answer.append(temp)
There are a couple problems with the regex that I can see from here. 从这里我可以看到正则表达式存在两个问题。 In your
re.findall
call, you're using start_1
and end_2
as if they're variables, but the regular expression will actually just treat them as the raw characters "start_1"
and "end_1"
, etc. To use the variables in the regular expression string, you would have to use format strings instead. 在
re.findall
调用中,您将start_1
和end_2
当作变量使用,但是正则表达式实际上只是将它们视为原始字符"start_1"
和"end_1"
等, "end_1"
。正则表达式字符串,则必须使用格式字符串。 Example: 例:
r'%s(.*?)%s' % (start_1, end_1)
Also, when you use .*end_1
, this will match any character, so it will match all characters until the final occurence of end_1
on the line. 另外,当您使用
.*end_1
,它将匹配任何字符,因此它将匹配所有字符,直到end_1
最后出现end_1
为止。 Both LAT #1
and LAT #2
end the same way, so if everything else were correct about the string, this would actually match `"-80[deg], LAT #2 MEAS=-110[de" LAT #1
和LAT #2
以相同的方式结束,因此,如果字符串中的其他所有内容都正确,则实际上将匹配“ --80°,LAT#2 MEAS = -110 [de”
Additionally, when you use brackets in a regular expression, you must escape them. 此外,当在正则表达式中使用方括号时,必须将其转义。 Literal brackets are used to specify a character set in regexes.
尖括号用于在正则表达式中指定字符集。
Here's an example where I just assume the variable line
contains your sample string "12:34:56.789 78:90:12.123123123 BLAH_BLAH blahblah : LAT #1 MEAS=-80[deg], LAT #2 MEAS=-110[deg] blah_BlHaBKBjFkjsa.c"
. 这是一个示例,其中我仅假设变量
line
包含您的示例字符串"12:34:56.789 78:90:12.123123123 BLAH_BLAH blahblah : LAT #1 MEAS=-80[deg], LAT #2 MEAS=-110[deg] blah_BlHaBKBjFkjsa.c"
。 You might need to adjust this snippet for your whole file. 您可能需要为整个文件调整此代码段。
prefix = r'LAT %s MEAS=(-?\d+)\[deg\]' # includes format string for the variable part of the expression.
p1 = r'#1'
p2 = r'#2
x = re.findall(prefix % p1, line)
y = re.findall(prefix % p2, line)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.