Python Split File By Lines

Short snippet I use to split a large text file into separate files by line count.  This will split a large file into separate files of 3 million lines each:

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count=0 fNum=0 pathIn = "c:\\temp\\inFile.txt" pathOut="c:\\temp\\outFile"+str(fNum)+".txt" fOut=open(pathOut, 'a') with open(pathIn) as fIn: for line in fIn: fOut.write(line) count=count+1 if count > 3000000: #Number of lines to split files on fNum=fNum+1 fOut.close() pathOut="c:\\temp\\outFile"+str(fNum)+".txt" fOut=open(pathOut, 'a') count=0

Edit: Just moved fNum=fNum+1 to before the rest of the if statement, as it was making the first file double the size it should have been.  All good!