Converting string to tuple without splitting characters

Question

I am striving to convert a string to a tuple without splitting the characters of the string in the process  Can somebody suggest an easy method to do this  Need a one liner   Fails       a    Quattro TT     print tuple a    Works      a     Quattro TT       print tuple a    Since my input is a string  I tried the code below by converting the string to a list  which again splits the string into characters         Fails    a    Quattro TT  print tuple list a     Expected Output      Quattro TT     Generated Output      Q    u    a    t    t    r    o         T    T

User · Answer

Subclassing tuple where some of these subclass instances may need to be one-string instances throws up something interesting.

class Sequence( tuple ):
    def __init__( self, *args ):
        # initialisation...
        self.instances = []

    def __new__( cls, *args ):
        for arg in args:
            assert isinstance( arg, unicode ), '# arg %s not unicode' % ( arg, )
        if len( args ) == 1:
            seq = super( Sequence, cls ).__new__( cls, ( args[ 0 ], ) )
        else:
            seq = super( Sequence, cls ).__new__( cls, args )
        print( '# END new Sequence len %d' % ( len( seq ), ))
        return seq

NB as I learnt from this thread, you have to put the comma after args[ 0 ].

The print line shows that a single string does not get split up.

NB the comma in the constructor of the subclass now becomes optional :

Sequence( u'silly' )

or

Sequence( u'silly', )

User · Answer

You can just do  a     No need to use a function    Note that the comma is necessary    Essentially  tuple a  means to make a tuple of the contents of a  not a tuple consisting of just a itself   The  contents  of a string  what you get when you iterate over it  are its characters  which is why it is split into characters

User · Answer

You can use the following solution   s  jack   tup tuple s split        output   jack

User · Answer

Have a look at the Python tutorial on tuples      A special problem is the construction of tuples containing 0 or 1 items  the syntax has some extra quirks to accommodate these  Empty tuples are constructed by an empty pair of parentheses  a tuple with one item is constructed by following a value with a comma  it is not sufficient to enclose a single value in parentheses   Ugly  but effective  For example    gt  gt  gt  empty       gt  gt  gt  singleton    hello         lt -- note trailing comma  gt  gt  gt  len empty  0  gt  gt  gt  len singleton  1  gt  gt  gt  singleton   hello       If you put just a pair of parentheses around your string object  they will only turn that expression into an parenthesized expression  emphasis added       A parenthesized expression list yields whatever that expression list yields  if the list contains at least one comma  it yields a tuple  otherwise  it yields the single expression that makes up the expression list       An empty pair of parentheses yields an empty tuple object  Since tuples are immutable  the rules for literals apply  i e   two occurrences of the empty tuple may or may not yield the same object        Note that tuples are not formed by the parentheses  but rather by use of the comma operator  The exception is the empty tuple  for which parentheses are required     allowing unparenthesized    nothing    in expressions would cause ambiguities and allow common typos to pass uncaught    That is  assuming Python 2 7    a    Quattro TT  print tuple a            lt -- you create a tuple from a sequence                               which is a string  print tuple  a           lt -- you create a tuple from a sequence                               which is a list containing a string  print tuple list a       lt -- you create a tuple from a sequence                               which you create from a string  print  a                 lt -- you create a tuple containing the string print  a                 lt -- it s just the string wrapped in parentheses   The output is as expected     Q    u    a    t    t    r    o         T    T     Quattro TT      Q    u    a    t    t    r    o         T    T     Quattro TT    Quattro TT     To add some notes on the print statement  When you try to create a single-element tuple as part of a print statement in Python 2 7  as in print  a    you need to use the parenthesized form  because the trailing comma of print a  would else be considered part of the print statement and thus cause the newline to be suppressed from the output and not a tuple being created      A   n  character is written at the end  unless the print statement ends with a comma    In Python 3 x most of the above usages in the examples would actually raise SyntaxError  because in Python 3 print turns into a function  you need to add an extra pair of parentheses   But especially this may cause confusion   print  a                 lt -- this prints a tuple containing  a  in Python 2 x                             but only  a  in Python 3 x

User · Answer

You can use eval    gt  gt  gt  a     Quattro TT      gt  gt  gt  eval str a     Quattro TT

User · Answer

I use this function to convert string to tuple  import ast  def parse tuple string       try          s   ast literal eval str string           if type s     tuple              return s         return     except          return   Usage  parse tuple    A   B   C         Result    A    B    C      In your case  you do  value   parse tuple     s       a

User · Answer

This only covers a simple case   a      Quattro TT    print tuple a    If you use only delimiter like          then it could work   I used a string from configparser like so   list users       test1        test2        test3     and the i get from file tmp   config ob get section name  option name   gt  gt  gt        test1        test2        test3          In this case the above solution does not work  However  this does work   def fot tuple self  some str              test1        test2        test3          some str   some str replace                         test1        test2        test3          some str   some str replace                         test1        test2        test3         some str   some str replace                                    test1 test2 test3         some str   some str replace                            test1 test2 test3        and now i could convert to tuple      return tuple item for item in some str split          if item strip

User · Answer

Just in case someone comes here trying to know how to create a tuple assigning each part of the string  Quattro  and  TT  to an element of the list  it would be like this  print tuple a split

User · Answer

See    Quattro TT    is a string   Since string is a list of characters  this is the same as    Q    u    a    t    t    r    o         T    T     Now       Quattro TT     is a list with a string in the first position   Also     a    Quattro TT   list a    is a string converted into a list   Again  since string is a list of characters  there is not much change   Another information     tuple something    This convert something into tuple   Understanding all of this  I think you can conclude that nothing fails

[python] Converting string to tuple without splitting characters

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