python - Reading entire file and join nth line -


input file-input.txt

entry1:name entry1:description entry1:reference_number --- entry2:name entry2:description entry2:reference_number ---

output file-output.txt

entry1:name entry1:description entry1:reference_number --- entry2:name entry2:description entry2:reference_number ---

source code 

def line_break_join(infilepath, n):     open(infilepath) infile:     in range(1,4):        print file.readline()  line_break_join("file1.txt", 4)

i can give break after reading 4 lines. furthermore want join 4 lines , read thru entire file , join 4 lines each , accordingly. suggestion appreciate. thanks.

reading lines in 1 go not efficient if file large. following possible solution:

def read_write_batch(inpath, outpath, n):     open(inpath) infile, open(outpath, 'w') outfile:         batch = []         line in infile:             batch.append(line.strip())             if len(batch) == n:                 outfile.write(':'.join(batch))                 outfile.write('\n')                 batch = []  if __name__ == '__main__':     read_write_batch('/tmp/test.txt', '/tmp/out.txt', 4)

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