Python variables as keys to dict

Question

Is there an easier way to do this in Python  2 7    Note  This isn t anything fancy  like putting all local variables into a dictionary  Just the ones I specify in a list   apple   1 banana    f  carrot   3 fruitdict         I want to set the key equal to variable name  and value equal to variable value   is there a more Pythonic way to get   apple   1   banana    f    carrot   3    for x in  apple  banana  carrot       fruitdict x    x    Won t work

User · Answer

Well this is a bit  umm     non-Pythonic     ugly     hackish       Here s a snippet of code assuming you want to create a dictionary of all the local variables you create after a specific checkpoint is taken   checkpoint      checkpoint      locals   keys         Various local assigments here     var keys since checkpoint   set locals   keys    - set checkpoint  new vars   dict   for each in var keys since checkpoint     new vars each    locals   each    Note that we explicitly add the  checkpoint  key into our capture of the locals   keys    I m also explicitly taking a slice of that though it shouldn t be necessary in this case since the reference has to be flattened to add it to the    checkpoint    list   However  if you were using a variant of this code and tried to shortcut out the   checkpoint     portion  because that key was already inlocals    for example      then  without the     slice you could end up with a reference to thelocals   keys    whose values would change as you added variables   Offhand I can t think of a way to call something like new vars update   with a list of keys to be added updated   So thefor loop is most portable   I suppose a dictionary comprehension could be used in more recent versions of Python   However that woudl seem to be nothing more than a round of code golf

User · Answer

This question has practically been answered  but I just wanted to say it was funny that you said     This isn t anything fancy  like   putting all local variables into a   dictionary    Because it is actually  fancier   what you want is   apple   1 banana    f  carrot   3 fruitdict         I want to set the key equal to variable name  and value equal to variable value   is there a more Pythonic way to get   apple   1   banana    f    carrot   3    names   apple banana carrot  split     I m just being lazy for this post items   globals                        or locals    for name in names      fruitdict name    items name    Honestly  what you are doing is just copying items from one dictionary to another    Greg Hewgill practically gave the whole answer  I just made it complete      and like people suggested  you should probably be putting these in the dictionary in the first place  but I ll assume that for some reason you can t

User · Answer

why you don t do the opposite    fruitdict             apple  1         banana   f          carrot  3     locals   update fruitdict    Update    don t use the code above check the comment   by the way why you don t mark the vars that you want to get i don t know  maybe like this     All the vars that i want to get are followed by  fruit apple fruit   1 carrot fruit    f   for var in locals        if var endswith  fruit           you dict update  var locals   var

User · Answer

The globals   function returns a dictionary containing all your global variables    gt  gt  gt  apple   1  gt  gt  gt  banana    f   gt  gt  gt  carrot   3  gt  gt  gt  globals     carrot   3   apple   1     builtins      lt module    builtin     built-in  gt      name        main        doc     None   banana    f     There is also a similar function called locals     I realise this is probably not exactly what you want  but it may provide some insight into how Python provides access to your variables   Edit  It sounds like your problem may be better solved by simply using a dictionary in the first place   fruitdict      fruitdict  apple     1 fruitdict  banana      f  fruitdict  carrot     3

User · Answer

A one-liner is -  fruitdict   dict zip   apple   banana   carrot     1  f    3

User · Answer

for i in   apple    banana    carrot        fruitdict i    locals   i

User · Answer

Not the most elegant solution  and only works 90  of the time   def vardict  args       ns   inspect stack   1  0  f locals     retval          for a in args          found   False         for k  v in ns items                if a is v                  retval k    v                 if found                      raise ValueError  Value found in more than one local variable      str a                   found   True         if found              continue         if  self  in ns              for k  v in ns  self     dict   items                    if a is v                      retval k    v                     if found                          raise ValueError  Value found in more than one instance attribute      str a                       found   True         if found              continue         for k  v in globals   items                if a is v                  retval k    v                 if found                      raise ValueError  Value found in more than one global variable      str a                   found   True         assert found   Couldn t find one of the parameters       return retval   You ll run into problems if you store the same reference in multiple variables  but also if multiple variables store the same small int  since these get interned

User · Answer

a    something  randround      randround  A       s    a   Worked

User · Answer

Try   to dict   lambda   k  k apple   1 banana    f  carrot   3 to dict apple apple  banana banana  carrot carrot     apple   1   banana    f    carrot   3

User · Answer

Based on the answer by mouad  here s a more pythonic way to select the variables based on a prefix     All the vars that I want to get start with fruit  fruit apple   1 fruit carrot    f  rotten   666  prefix    fruit   sourcedict   locals   fruitdict     v len prefix      sourcedict v                for v in sourcedict               if v startswith prefix      fruitdict     carrot    f    apple   1    You can even put that in a function with prefix and sourcedict as arguments

User · Answer

Here it is in one line  without having to retype any of the variables or their values   fruitdict update  k v for k v in locals   copy   iteritems   if k  2          and k     fruitdict

[python] Python variables as keys to dict

Examples related to python

Examples related to dictionary