Removing duplicate characters from a string

Question

How can I remove duplicate characters from a string using Python  For example  let s say I have a string   foo    mppmt    How can I make the string   foo    mpt    NOTE  Order is not important

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If order is not the matter    gt  gt  gt  foo  mppmt   gt  gt  gt     join set foo    pmt    To keep the order    gt  gt  gt  foo  mppmt   gt  gt  gt     join  j for i j in enumerate foo  if j not in foo  i     mpt

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If order is important    seen   set   result      for c in foo      if c not in seen          result append c          seen add c  result      join result    Or to do it without sets   result      for c in foo      if c not in result          result append c  result      join result

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If order does  matter  how about    gt  gt  gt  foo    mppmt   gt  gt  gt     join sorted set foo   key foo index    mpt

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from collections import OrderedDict def remove duplicates value           m list OrderedDict fromkeys value           s            for i in m              s  i         return s print remove duplicates  11223445566666ababzzz   123

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def remove duplicates value       var        for i in value          if i in value              if i in var                  pass             else                  var var i     return var  print remove duplicates  11223445566666ababzzz   123

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d      s  YOUR DESIRED STRING  res    for c in s      if c not in d        res append c        d c  1 print     join res

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mylist   quot ABA quot    quot CAA quot    quot ADA quot    results     for item in mylist       buffer         for char in item           if char not in buffer               buffer append char       results append  quot  quot  join buffer         print results    output  ABA  CAA  ADA    AB    CA    AD

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Create a list in Python and also a set which doesn t allow any duplicates  Solution1    def fix string       s   set       list          for ch in string          if ch not in s              s add ch              list append ch       return    join list           string    Protiijaayiiii  print fix string     Method 2    s    Protijayi   aa     ch  for i  ch in enumerate s  if ch not in s  i   print    join aa

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As was mentioned    join set foo   and collections OrderedDict will do   A added  foo   foo lower   in case the string has upper and lower case characters and you need to remove ALL duplicates no matter if they re upper or lower characters    from collections import OrderedDict foo    EugeneEhGhsnaWW  foo   foo lower   print    join OrderedDict fromkeys foo     prints eugnhsaw

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If order does not matter  you can use     join set foo     set   will create a set of unique letters in the string  and    join   will join the letters back to a string in arbitrary order   If order does matter  you can use a dict instead of a set  which since Python 3 7 preserves the insertion order of the keys   In the CPython implementation  this is already supported in Python 3 6 as an implementation detail    foo    mppmt  result      join dict fromkeys foo     resulting in the string  mpt   In earlier versions of Python  you can use collections OrderedDict  which has been available starting from Python 2 7

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As string is a list of characters  converting it to dictionary will remove all duplicates and will retain the order      join list dict fromkeys foo

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Check code and apply in your Program    Input   pppmm        s    ppppmm  s      join set s     print s   Output  pm

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def dupe str1       s set str1       return    join s  str1  geeksforgeeks  a dupe str1  print a    works well if order is not important

[python] Removing duplicate characters from a string

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