Delete x-line paragraphs from text file with Python -

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i have long text file paragraph 6 , 7 lines each. need take 7 line paragraphs , write them file , take 6 line paragraphs , write them file. or delete 6-line (7-line) paragraphs. each paragraph separated blank line (or 2 blank lines). text file example:

 firs name last name address1 address2 note 1 note 2 note3 note 4  first name lastname add 1 add 2 note2 note3 note4  etc...

i want use python 3 windows. welcome. thanks!

as welcome on stackoverflow, , because think have searched more code , propose following code.

it verifies paragraphs have not more 7 lines , not less 6 lines. warns when such paragraphs exist in source.

you'll remove prints have clean code, them can follow algorithm.

i think there no bug in it, don't take 100 % sure.

it isn't manner , choosed way can used types of files, big or not: iterating 1 line @ time. reading entire file in 1 pass done, , split list of lines, or treated of regexes; , when file enormous, reading in 1 time memory consuming.

with open('source.txt') fsource,\      open('six.txt','w') six,  open('seven.txt','w') seven:      buf = []     cnt = 0     exceeding7paragraphs = 0     tinyparagraphs = 0      line = 'go'     while line:         line = fsource.readline()         cnt += 1         buf.append(line)          if len(buf)<6 , line.rstrip('\n\r')=='':             tinyparagraphs += 1             print cnt,repr(line),"this line of paragraph < 6 void,"+\                   "\nthe treatment of paragraph skipped\n"+\                   '\n# '+str(cnt)+' '+ repr(line)+" skipped line "             buf = []             while line , line.rstrip('\n\r')=='':                 line = fsource.readline()                 cnt += 1                 if line=='':                     print "line",cnt,"is '' , eof -> program stopped"                 elif line.rstrip('\n\r')=='':                     print '#',cnt,repr(line)                 else:                     buf.append(line)                     print '!',cnt,repr(line),' put in void buf'         else:             print cnt,repr(line),' put in buf'             if len(buf)==6:             line = fsource.readline() # reading potential seventh line of paragraph             cnt += 1              if line.rstrip('\n\r'): # means content of seventh line isn't void                 buf.append(line)                 print cnt,repr(line),'seventh line put in buf'                 line = fsource.readline()                 cnt += 1                  if line.rstrip('\n\r'): # means content of eighth line isn't void                     exceeding7paragraphs += 1                     print cnt,repr(line),"the 8 line isn't void,"+\                           "\nthe treatment of paragraph skipped"+\                           "\neighth line skipped"                     buf = []                     while line , line.rstrip('\n\r'):                         line = fsource.readline()                         cnt += 1                         if line=='':                             print "line",cnt,"is '' , eof -> program stopped"                         elif line.rstrip('\n\r')=='':                             print '\n#',cnt,repr(line)                         else:                             print str(cnt) + ' ' + repr(line)+' skipped line'                  else:                     if line=='':                         print cnt,"line '' , eof -> program stopped\n"                     else: # line.rstrip('\n\r') ''                         print cnt,'eighth line void',repr(line)                     seven.write(''.join(buf) + '\n')                     print buf,'\n',len(buf),'lines recorded in file seven\n'                     buf = []              else:                 print cnt,repr(line),'seventh line: void'                 six.write(''.join(buf) + '\n')                 print buf,'\n',len(buf),'lines recorded in file six'                 buf = []                 if line=='':                     print "line",cnt,"is '' , eof -> program stopped"                 else:                     print '\nthe line is',cnt, repr(line)              while line , line.rstrip('\n\r')=='':                 line = fsource.readline()                 cnt += 1                 if line=='':                     print "line",cnt,"is '' , eof -> program stopped"                 elif line.rstrip('\n\r')=='':                     print '#',cnt,repr(line)                 else: # line.rstrip('\n\r') != ''                     buf.append(line)                     print '!',cnt,repr(line),' put in void buf'  if exceeding7paragraphs>0:     print '\nwarning :'+\           '\nthere '+str(exceeding7paragraphs)+' paragraphs number of lines exceeds 7.'  if tinyparagraphs>0:     print '\nwarning :'+\           '\nthere '+str(tinyparagraphs)+' paragraphs number of lines less 6.'   print '\n====================================================================' print 'file six\n' open('six.txt') six:     print six.read()   print '====================================================================' print 'file seven\n' open('seven.txt') seven:     print seven.read()

i upvote question because problem not easy it's seems solve, , not let 1 post , 1 downvote, demoralizing beginning. try make presentation better next time, other said.

.

edit:

here's simplified code text containing paragraphs of 6 or 7 lines precisely, separated 1 or 2 lines exactly, stated in problem's wording

with open('source2.txt') fsource,\      open('six.txt','w') six,  open('seven.txt','w') seven:      buf = []      line = fsource.readline()     while not line: # go first non empty line         line = fsource.readline()       while true:         buf.append(line) # line first of paragraph         print '\n- first line of paragraph',repr(line)          in xrange(5):             buf.append(fsource.readline())         # @ point , 6 lines of paragraph have been read         print '-- buf 6 : ',buf          line = fsource.readline()         print '--- line seventh',repr(line),id(line)          if line.rstrip('\r\n'):             buf.append(line)             seven.write(''.join(buf) + '\n')             buf = []             line = fsource.readline()         else:             six.write(''.join(buf) + '\n')             buf = []         # @ point, line empty line after paragraph or eof         print '---- line after',repr(line),id(line)          line = fsource.readline()         print '----- second line after',repr(line)         # @ point, line empty line after paragraph or eof         # or first line of new paragraph          if not line: # eof             break         if not line.rstrip('\r\n'): # second empty line             line = fsource.readline()         # line first of new paragraph   print '\n====================================================================' print 'file six\n' open('six.txt') six:     print six.read()   print '====================================================================' print 'file seven\n' open('seven.txt') seven:     print seven.read()

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