Remove trailing newline from the elements of a string list

Question

I have to take a large list of words in the form     this n    is n    a n    list n    of n    words n     and then using the strip function  turn it into     this    is    a    list    of    words     I thought that what I had written would work  but I keep getting an error saying        list  object has no attribute  strip     Here is the code that I tried   strip list      for lengths in range 1 20       strip list append 0   longest word in the text file is 20 characters long for a in lines      strip list append lines a  strip

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my list     this n    is n    a n    list n    of n    words n   print  l strip   for l in my list     Output     this    is    a    list    of    words

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This can be done using list comprehensions as defined in PEP 202   w strip   for w in    this n    is n    a n    list n    of n    words n

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list comprehension   x strip   for x in lst

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All other answers  and mainly about list comprehension  are great  But just to explain your error    strip list      for lengths in range 1 20       strip list append 0   longest word in the text file is 20 characters long for a in lines      strip list append lines a  strip      a is a member of your list  not an index  What you could write is this         for a in lines      strip list append a strip      Another important comment  you can create an empty list this way   strip list    0    20   But this is not so useful  as  append appends stuff to your list  In your case  it s not useful to create a list with defaut values  as you ll build it item per item when appending stripped strings   So your code should be like   strip list      for a in lines      strip list append a strip      But  for sure  the best one is this one  as this is exactly the same thing   stripped    line strip   for line in lines    In case you have something more complicated than just a  strip  put this in a function  and do the same  That s the most readable way to work with lists

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You can use lists comprehensions   strip list    item strip   for item in lines    Or the map function     with a lambda strip list   map lambda it  it strip    lines     without a lambda strip list   map str strip  lines

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gt  gt  gt  my list     this n    is n    a n    list n    of n    words n    gt  gt  gt  map str strip  my list    this    is    a    list    of    words

User · Answer

If you need to remove just trailing whitespace  you could use str rstrip    which should be slightly more efficient than str strip      gt  gt  gt  lst     this n    is n    a n    list n    of n    words n    gt  gt  gt   x rstrip   for x in lst    this    is    a    list    of    words    gt  gt  gt  list map str rstrip  lst     this    is    a    list    of    words

[python] Remove trailing newline from the elements of a string list

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