Removing a list of characters in string

Question

I want to remove characters in a string in python   string replace          replace          replace          replace               But I have many characters I have to remove  I thought about a list  list                             But how can I use the list to replace the characters in the string

User · Answer

If you are using python3 and looking for the translate solution - the function was changed and now takes 1 parameter instead of 2     That parameter is a table  can be dictionary  where each key is the Unicode ordinal  int  of the character to find and the value is the replacement  can be either a Unicode ordinal or a string to map the key to    Here is a usage example    gt  gt  gt  list                         gt  gt  gt  s    This is  my  str ing    gt  gt  gt  s translate  ord x      for x in list    This is my string

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Here is a more itertools approach   import more itertools as mit   s    A B C D E F   blacklist                join mit flatten mit split at s  pred lambda x  x in set blacklist        ABCDEF    Here we split upon items found in the blacklist  flatten the results and join the string

User · Answer

You can use the translate method   s translate None

User · Answer

you could use something like this  def replace all text  dic     for i  j in dic iteritems        text   text replace i  j    return text   This code is not my own and comes from here its a great article and dicusses in depth doing this

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I am thinking about a solution for this  First I would make the string input as a list  Then I would replace the items of list  Then through using join command  I will return list as a string  The code can be like this   def the replacer text       test              for m in range len text            test append text m           if test m                or test m                or test m                or test m                 or test m                              test n         return    join test    This would remove anything from the string  What do you think about that

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How about this - a one liner    reduce lambda x y   x replace y                             Test       Stri ng

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simple way   import re str    this is string       gt  gt  lt  lt   foo--- gt  bar   -tuna-    sandwich- -is- -  good      condense multiple empty spaces into 1 str       join str split       replace empty space with dash str   str replace      -       take out any char that matches regex str   re sub          amp       lt  gt         str    output   this-is-string--foo----bar--tuna---sandwich--is---good

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Also an interesting topic on removal UTF-8 accent form a string converting char to their standard non-accentuated char   What is the best way to remove accents in a python unicode string   code extract from the topic   import unicodedata  def remove accents input str       nkfd form   unicodedata normalize  NFKD   input str      return u   join  c for c in nkfd form if not unicodedata combining c

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Remove     amp    from below string       s    this is my string   and i will   remove   these         new string   s translate s maketrans            amp       print new string     output  this is my string  and i will  remove  these

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Python 3  single line list comprehension implementation   from string import ascii lowercase    abcdefghijklmnopqrstuvwxyz  def remove chars input string  removable     return    join    for   in input string if   not in removable    print remove chars input string  Stack Overflow   removable ascii lowercase    gt  gt  gt   S O

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You can use str translate     s translate None            Example    gt  gt  gt  s    asjo fdjk djaso oio kod kjods dkps   gt  gt  gt  s translate None           asjofdjkdjasooiokodkjodsdkps

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These days I am diving into scheme  and now I think am good at recursing and eval  HAHAHA  Just share some new ways   first  eval it  print eval  string s        join    replace   s       i for i in replace list       second   recurse it  def repn string replace list       if replace list              return string     else          return repn string replace replace list pop       replace list   print repn string replace list    Hey  don t downvote  I am just want to share some new idea

User · Answer

join c for c in myString if not c in badTokens

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i think this is simple enough and will do   list                          the list goes on       theString    dlkaj lkdjf adklfaj lsd fa dfj alkdjf   is an example string  newString     the unwanted character free string for i in range len TheString        if theString i  in list          newString        concatenate an empty string      else          newString    theString i    this is one way to do it  But if you are tired of keeping a list of characters that you want to remove  you can actually do it by using the order number of the strings you iterate through  the order number is the ascii value of that character  the ascii number for 0 as a char is 48 and the ascii number for lower case z is 122 so   theString    lkdsjf alkd8a asdjf lkaheoialkdjf ad  newString      for i in range len theString         if ord theString i    lt  48 or ord theString i    gt  122   ord     gt  ascii num           newString            else          newString    theString i

User · Answer

Perhaps a more modern and functional way to achieve what you wish    gt  gt  gt  subj    A B C    gt  gt  gt  list   set                             gt  gt  gt  filter lambda x  x not in list  subj   ABC    please note that for this particular purpose it s quite an overkill  but once you need more complex conditions  filter comes handy

User · Answer

Another approach using regex        join re split r           s

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If you re using python2 and your inputs are strings  not unicodes   the absolutely best method is str translate    gt  gt  gt  chars to remove                    gt  gt  gt  subj    A B C    gt  gt  gt  subj translate None     join chars to remove    ABC    Otherwise  there are following options to consider   A  Iterate the subject char by char  omit unwanted characters and join the resulting list    gt  gt  gt  sc   set chars to remove   gt  gt  gt     join  c for c in subj if c not in sc    ABC     Note that the generator version    join c for c      will be less efficient    B  Create a regular expression on the fly and re sub with an empty string    gt  gt  gt  import re  gt  gt  gt  rx         re escape    join chars to remove          gt  gt  gt  re sub rx      subj   ABC     re escape ensures that characters like   or   won t break the regular expression    C  Use the mapping variant of translate    gt  gt  gt  chars to remove    u d   u G   u      gt  gt  gt  subj   u A BdCG   gt  gt  gt  dd    ord c  None for c in chars to remove   gt  gt  gt  subj translate dd  u ABC    Full testing code and timings    coding utf8  import re  def remove chars iter subj  chars       sc   set chars      return    join  c for c in subj if c not in sc    def remove chars re subj  chars       return re sub       re escape    join chars              subj   def remove chars re unicode subj  chars       return re sub u   u      re escape    join chars              subj   def remove chars translate bytes subj  chars       return subj translate None     join chars    def remove chars translate unicode subj  chars       d    ord c  None for c in chars      return subj translate d   import timeit  sys  def profile f       assert f subj  chars to remove     test     t   timeit timeit lambda  f subj  chars to remove   number 1000      print    0  3f   1   format t  f   name      print  sys version  PYTHON2   sys version info 0     2  print    n plain  string  n    chars to remove                   subj    A B C     1000 test    ABC    1000  profile remove chars iter  profile remove chars re   if PYTHON2      profile remove chars translate bytes  else      profile remove chars translate unicode   print    nunicode string  n    if PYTHON2      chars to remove    u d   u G   u         subj   u A BdCG  else      chars to remove     d    G            subj    A BdCG   subj   subj   1000 test    ABC    1000  profile remove chars iter   if PYTHON2      profile remove chars re unicode  else      profile remove chars re   profile remove chars translate unicode    Results   2 7 5  default  Mar  9 2014  22 15 05    GCC 4 2 1 Compatible Apple LLVM 5 0  clang-500 0 68     plain  string   0 637 remove chars iter 0 649 remove chars re 0 010 remove chars translate bytes  unicode string   0 866 remove chars iter 0 680 remove chars re unicode 1 373 remove chars translate unicode  ---  3 4 2  v3 4 2 ab2c023a9432  Oct  5 2014  20 42 22    GCC 4 2 1  Apple Inc  build 5666   dot 3     plain  string   0 512 remove chars iter 0 574 remove chars re 0 765 remove chars translate unicode  unicode string   0 817 remove chars iter 0 686 remove chars re 0 876 remove chars translate unicode    As a side note  the figure for remove chars translate bytes might give us a clue why the industry was reluctant to adopt Unicode for such a long time

User · Answer

Why not a simple loop   for i in replace list      string   string replace i        Also  avoid naming lists  list   It overrides the built-in function list

[python] Removing a list of characters in string

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