Question

Pretty new to Python and have been writing up a script to pick out certain lines of a basic log file

Basically the function searches lines of the file and when it finds one I want to output to a separate file, adds it into a list, then also adds the next five lines following that. This then gets output to a separate file at the end in a different funcition.

What I’ve been trying to do following that is jump the loop to continue on from the last of those five lines, rather than going over them again. I thought the last line in the code would solved the problem, but unfortunately not.

Are there any recommended variations of a for loop I could use for this purpose?

def readSingleDayLogs(aDir): 
print 'Processing files in ' + str(aDir)    + '\n'
lineNumber = 0
try:
    open_aDirFile = open(aDir)  #open the log file
    for aLine in open_aDirFile: #total the num. lines in file
        lineNumber = lineNumber + 1
    lowerBound = 0
    for lineIDX in range(lowerBound, lineNumber):          
        currentLine = linecache.getline(aDir, lineIDX)
        if (bunch of logic conditions):
                    issueList.append(currentLine)
                    for extraLineIDX in range(1, 6): #loop over the next five lines of the error and append to issue list
                        extraLine = linecache.getline(aDir, lineIDX+ extraLineIDX) #get the x extra line after problem line
                        issueList.append(extraLine)
                    issueList.append('\n\n')
                    lowerBound = lineIDX

Answer 1

You should use a while loop :

line = lowerBound
while line < lineNumber:
    ...
    if conditions:
        ...
        for lineIDX in range(line, line+6):
           ...
        line = line + 6
    else:
        line = line + 1