Getting rid of n when using readlines

Question

I have a  txt file with values in it   The values are listed like so   Value1 Value2 Value3 Value4   My goal is to put the values in a list  When I do so  the list looks like this     Value1 n    Value2 n         The  n is not needed   Here is my code   t   open  filename txt    r w   contents   t readline    alist       for i in contents      alist append i

User · Answer

You can use  rstrip   n   to only remove newlines from the end of the string   for i in contents      alist append i rstrip   n      This leaves all other whitespace intact  If you don t care about whitespace at the start and end of your lines  then the big heavy hammer is called  strip     However  since you are reading from a file and are pulling everything into memory anyway  better to use the str splitlines   method  this splits one string on line separators and returns a list of lines without those separators  use this on the file read   result and don t use file readlines   at all   alist   t read   splitlines

User · Answer

I had the same problem and i found the following solution to be very efficient  I hope that it will help you or everyone else who wants to do the same thing   First of all  i would start with a  with  statement as it ensures the proper open close of the file   It should look something like this   with open  filename txt    r    as f      contents    x strip   for x in f readlines      If you want to convert those strings  every item in the contents list is a string  in integer or float you can do the following   contents    float contents i   for i in range len contents      Use int instead of float if you want to convert to integer   It s my first answer in SO  so sorry if it s not in the proper formatting

User · Answer

I recently used this to read all the lines from a file   alist   open  maze txt   read   split     or you can use this for that little bit of extra added safety   with f as open  maze txt        alist   f read   split     It doesn t work with whitespace in-between text in a single line  but it looks like your example file might not have whitespace splitting the values  It is a simple solution and it returns an accurate list of values  and does not add an empty string     for every empty line  such as a newline at the end of the file

User · Answer

I used the strip function to get rid of newline character as split lines was throwing memory errors on 4 gb File   Sample Code   with open  C   aapl csv   r   as apple      for apps in apple readlines            print apps strip

User · Answer

The easiest way to do this is to write file readline   0 -1  This will read everything except the last character  which is the newline

User · Answer

I d do this   alist    line rstrip   for line in open  filename txt      or   with open  filename txt   as f      alist    line rstrip   for line in f

User · Answer

for each string in your list  use  strip   which removes whitespace from the beginning or end of the string   for i in contents      alist append i strip      But depending on your use case  you might be better off using something like numpy loadtxt or even numpy genfromtxt if you need a nice array of the data you re reading from the file

User · Answer

with open  D   file txt    r   as f1      lines   f1 readlines   lines    s  -1  for s in lines

User · Answer

from string import rstrip  with open  bvc txt   as f      alist   map rstrip  f    Nota Bene  rstrip   removes the whitespaces  that is to say    f     n    r    t    v    x and blank    but I suppose you re only interested to keep the significant characters in the lines   Then  mere map strip  f  will fit better  removing the heading whitespaces too     If you really want to eliminate only the NL  n and RF  r symbols  do   with open  bvc txt   as f      alist   f read   splitlines     splitlines   without argument passed doesn t keep the NL and RF symbols  Windows records the files with NLRF at the end of lines  at least on my machine  but keeps the other whitespaces  notably the blanks and tabs      with open  bvc txt   as f      alist   f read   splitlines True    has the same effect as   with open  bvc txt   as f      alist   f readlines     that is to say the NL and RF are kept

User · Answer

After opening the file  list comprehension can do this in one line   fh open  filename   newlist    line rstrip   for line in fh readlines    fh close     Just remember to close your file afterwards

User · Answer

This should do what you want  file contents in a list  by line  without  n   with open filename  as f      mylist   f read   splitlines

[python] Getting rid of \n when using .readlines()

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