![]() Output_filename = os.path.normpath("output/parsed_lines. # Output file, where the matched loglines will be copied to In the below code, specify the path where you want to save the screenshot file. ![]() Once screenshot is taken it is imporant to specific the place where you want ot save that file. ![]() #CONTINUOUSLY READ AND COPY LOG FILE PYTHON CODE#Use the below code to initiate screenshot. Line_regex = re.compile(r".*fwd=\"12.34.56.78\".*$") Screenshot () method of pyautogui module can be used to capture the screen. # Regex used to match relevant loglines (in this case, a specific IP address) So I decided to take a few extra minutes and publish this post to encourage others to give Python a shot, with an example (of a pretty common) use case. Like debugging server logs.Ī couple minutes, and 22 lines of python later: I had taken a few million lines of server logs, and extracted the ~50 or so messages that were relevant. I've recently gotten into Python (initially as a requirement for a project at work), and while I still have a lot to learn, I have found it to be amazing tool for scripting out quick little solutions to annoying problems. Opening these log files in a text editor and doing a quick text search wasn't a great option: the log files had millions of log lines, were 500MB in size, and the text editors just gave up trying to search, multi-select, and extract the lines I needed. The if _name_ = '_main_': boilerplate is optional, but considered standard practice.The other day I found myself in the unfortunate position of needing to scan through raw server logs to try and gather some information around a rare issue. def search(filename, text):įor result in search('/home/nick/python/chap8ReadingWritingFiles/15Jan2016_000000.txt', 'Fail'): If you're interested more in passing back the results, a better way would be to yield the results back to the caller. I'd generalize your function to search for any text. In general, you should name functions after the task that they accomplish, rather than how they accomplish the task. This also means that your function is misnamed. You don't need a regular expression to search for a fixed literal string. (You also don't need to make a copy of myResList at the end using myResList.) I recommend working line by line so that you can handle large files better. This task does not require you to read the entire file at once. You almost always want to call open() in the context of a with-block, so that the file will get closed automatically when exiting the block. This is a pretty strong convention for Python, since indentation matters a lot. The standard indentation for Python, specified by PEP 8, is four spaces. MyFile = '/home/nick/python/chap8ReadingWritingFiles/15Jan2016_000000.txt' ![]() This code is meant to open a log file (will eventually be retrieved real-time), go through it line by line using RegEx to find "Fail", add those lines reporting failures to a list and return the completed list as a string joined with new lines. There are a lot of concepts I haven't learned yet. Please take a look and let me know if this is sound and where it can be improved. I always feel like I'm over complicating the code. This code is something that I wanted to do once I completed the chapters dealing with opening and reading files, and RegEx. Please bear with me, I'm only about a week into Python. ![]()
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