How do I split a multi-line string into multiple lines

Question

I have a multi-line string literal that I want to do an operation on each line  like so   inputString      Line 1 Line 2 Line 3      I want to do something like the following   for line in inputString      doStuff

User · Accepted Answer

inputString splitlines     Will give you a list with each item  the splitlines   method is designed to split each line into a list element

User · Answer

Use str splitlines    splitlines   handles newlines properly  unlike split  quot  n quot    It also has the the advantage mentioned by  efotinis of optionally including the newline character in the split result when called with a True argument   Why you shouldn t use split  quot  n quot     n  in Python  represents a Unix line-break  ASCII decimal code 10   independently from the platform where you run it  However  the linebreak representation is platform-dependent  On Windows   n is two characters  CR and LF  ASCII decimal codes 13 and 10  AKA  r and  n   while on any modern Unix  including OS X   it s the single character LF  print  for example  works correctly even if you have a string with line endings that don t match your platform   gt  gt  gt  print  quot  a  n b  r n c  quot   a   b   c  However  explicitly splitting on  quot  n quot   will yield platform-dependent behaviour   gt  gt  gt   quot  a  n b  r n c  quot  split  quot  n quot      a      b  r     c     Even if you use os linesep  it will only split according to the newline separator on your platform  and will fail if you re processing text created in other platforms  or with a bare  n   gt  gt  gt   quot  a  n b  r n c  quot  split os linesep     a  n b      c     splitlines solves all these problems   gt  gt  gt   quot  a  n b  r n c  quot  splitlines      a      b      c      Reading files in text mode partially mitigates the newline representation problem  as it converts Python s  n into the platform s newline representation  However  text mode only exists on Windows   On Unix systems  all files are opened in binary mode  so using split   n   in a UNIX system with a Windows file will lead to undesired behavior  Also  it s not unusual to process strings with potentially different newlines from other sources  such as from a socket

User · Answer

The original post requested for code which prints some rows  if they are true for some condition  plus the following row   My implementation would be this   text      1 sfasdf asdfasdf 2 sfasdf asdfgadfg 1 asfasdf sdfasdgf      text   text splitlines   rows to print       for line in range len text        if text line  0      1           rows to print   rows to print    line  line   1   rows to print   sorted list rows to print    for i in rows to print      print text i

User · Answer

Might be overkill in this particular case but another option involves using StringIO to create a file-like object  for line in StringIO StringIO inputString       doStuff

User · Answer

Might be overkill in this particular case but another option involves using StringIO to create a file-like object  for line in StringIO StringIO inputString       doStuff

User · Answer

Like the others said   inputString split   n      -- gt    Line 1    Line 2    Line 3     This is identical to the above  but the string module s functions are deprecated and should be avoided   import string string split inputString    n      -- gt    Line 1    Line 2    Line 3     Alternatively  if you want each line to include the break sequence  CR LF CRLF   use the splitlines method with a True argument   inputString splitlines True     -- gt    Line 1 n    Line 2 n    Line 3

User · Answer

I wish comments had proper code text formatting  because I think  1 CR  s answer needs more bumps  and I would like to augment his answer  Anyway  He led me to the following technique  it will use cStringIO if available  BUT NOTE  cStringIO and StringIO are not the same  because you cannot subclass cStringIO    it is a built-in    but for basic operations the syntax will be identical  so you can do this    try      import cStringIO     StringIO   cStringIO except ImportError      import StringIO  for line in StringIO StringIO variable with multiline string       pass print line strip

User · Answer

Like the others said   inputString split   n      -- gt    Line 1    Line 2    Line 3     This is identical to the above  but the string module s functions are deprecated and should be avoided   import string string split inputString    n      -- gt    Line 1    Line 2    Line 3     Alternatively  if you want each line to include the break sequence  CR LF CRLF   use the splitlines method with a True argument   inputString splitlines True     -- gt    Line 1 n    Line 2 n    Line 3

User · Answer

Like the others said   inputString split   n      -- gt    Line 1    Line 2    Line 3     This is identical to the above  but the string module s functions are deprecated and should be avoided   import string string split inputString    n      -- gt    Line 1    Line 2    Line 3     Alternatively  if you want each line to include the break sequence  CR LF CRLF   use the splitlines method with a True argument   inputString splitlines True     -- gt    Line 1 n    Line 2 n    Line 3

User · Answer

Like the others said   inputString split   n      -- gt    Line 1    Line 2    Line 3     This is identical to the above  but the string module s functions are deprecated and should be avoided   import string string split inputString    n      -- gt    Line 1    Line 2    Line 3     Alternatively  if you want each line to include the break sequence  CR LF CRLF   use the splitlines method with a True argument   inputString splitlines True     -- gt    Line 1 n    Line 2 n    Line 3

User · Answer

The original post requested for code which prints some rows  if they are true for some condition  plus the following row   My implementation would be this   text      1 sfasdf asdfasdf 2 sfasdf asdfgadfg 1 asfasdf sdfasdgf      text   text splitlines   rows to print       for line in range len text        if text line  0      1           rows to print   rows to print    line  line   1   rows to print   sorted list rows to print    for i in rows to print      print text i

User · Answer

I wish comments had proper code text formatting  because I think  1 CR  s answer needs more bumps  and I would like to augment his answer  Anyway  He led me to the following technique  it will use cStringIO if available  BUT NOTE  cStringIO and StringIO are not the same  because you cannot subclass cStringIO    it is a built-in    but for basic operations the syntax will be identical  so you can do this    try      import cStringIO     StringIO   cStringIO except ImportError      import StringIO  for line in StringIO StringIO variable with multiline string       pass print line strip

User · Answer

Use str splitlines    splitlines   handles newlines properly  unlike split  quot  n quot    It also has the the advantage mentioned by  efotinis of optionally including the newline character in the split result when called with a True argument   Why you shouldn t use split  quot  n quot     n  in Python  represents a Unix line-break  ASCII decimal code 10   independently from the platform where you run it  However  the linebreak representation is platform-dependent  On Windows   n is two characters  CR and LF  ASCII decimal codes 13 and 10  AKA  r and  n   while on any modern Unix  including OS X   it s the single character LF  print  for example  works correctly even if you have a string with line endings that don t match your platform   gt  gt  gt  print  quot  a  n b  r n c  quot   a   b   c  However  explicitly splitting on  quot  n quot   will yield platform-dependent behaviour   gt  gt  gt   quot  a  n b  r n c  quot  split  quot  n quot      a      b  r     c     Even if you use os linesep  it will only split according to the newline separator on your platform  and will fail if you re processing text created in other platforms  or with a bare  n   gt  gt  gt   quot  a  n b  r n c  quot  split os linesep     a  n b      c     splitlines solves all these problems   gt  gt  gt   quot  a  n b  r n c  quot  splitlines      a      b      c      Reading files in text mode partially mitigates the newline representation problem  as it converts Python s  n into the platform s newline representation  However  text mode only exists on Windows   On Unix systems  all files are opened in binary mode  so using split   n   in a UNIX system with a Windows file will lead to undesired behavior  Also  it s not unusual to process strings with potentially different newlines from other sources  such as from a socket

[python] How do I split a multi-line string into multiple lines?

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