How can I increment a char

Question

I m new to Python  coming from Java and C  How can I increment a char  In Java or C  chars and ints are practically interchangeable  and in certain loops  it s very useful to me to be able to do increment chars  and index arrays by chars    How can I do this in Python  It s bad enough not having a traditional for     looper - is there any way I can achieve what I want to achieve without having to rethink my entire strategy

User · Answer

There is a way to increase character using ascii_letters from string package which ascii_letters is a string that contains all English alphabet, uppercase and lowercase:

>>> from string import ascii_letters
>>> ascii_letters[ascii_letters.index('a') + 1]
'b'
>>> ascii_letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

Also it can be done manually;

>>> letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> letters[letters.index('c') + 1]
'd'

User · Answer

Check this  USING FOR LOOP for a in range 5       x  A      val chr ord x    a      print val   LOOP OUTPUT  A B C D E

User · Answer

def doubleChar str       result          for char in str          result    char   2     return result  print doubleChar  amar      output    aammaarr

User · Answer

I came from PHP  where you can increment char  A to B  Z to AA  AA to AB etc   using    operator  I made a simple function which does the same in Python  You can also change list of chars to whatever  lowercase  uppercase  etc   is your need     Increment char  a - gt  b  az - gt  ba  def inc char text  chlist    ABCDEFGHIJKLMNOPQRSTUVWXYZ          Unique and sort     chlist      join sorted set str chlist         chlen   len chlist      if not chlen          return        text   str text        Replace all chars but chlist     text   re sub        chlist            text      if not len text           return chlist 0        Increment     inc          over   False     for i in range 1  len text  1           lchar   text -i          pos   chlist find lchar    1         if pos  lt  chlen              inc   chlist pos    inc             over   False             break         else              inc   chlist 0    inc             over   True     if over          inc    chlist 0      result   text 0 -len inc     inc     return result

User · Answer

bad enough not having a traditional for     looper     What     Are you trying to do   import string for c in string lowercase         do something with c      Or perhaps you re using string uppercase or string letters   Python doesn t have for     because there are often better ways to do it   It also doesn t have character math because it s not necessary  either

User · Answer

For me i made the fallowing as a test  string 1  quot abcd quot   def test string 1      i   0    p    quot  quot     x   len string 1     while i  lt  x      y    string 1  i      i i 1     s   chr ord y    1      p p s     print p   test string 1

User · Answer

In Python 2 x  just use the ord and chr functions    gt  gt  gt  ord  c   99  gt  gt  gt  ord  c     1 100  gt  gt  gt  chr ord  c     1   d   gt  gt  gt     Python 3 x makes this more organized and interesting  due to its clear distinction between bytes and unicode  By default  a  string  is unicode  so the above works  ord receives Unicode chars and chr produces them    But if you re interested in bytes  such as for processing some binary data stream   things are even simpler    gt  gt  gt  bstr   bytes  abc    utf-8    gt  gt  gt  bstr b abc   gt  gt  gt  bstr 0  97  gt  gt  gt  bytes  97  98  99   b abc   gt  gt  gt  bytes  bstr 0    1  98  99   b bbc

[python] How can I increment a char?

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