Fastest way to convert a dict s keys values from unicode to str

Question

I m receiving a dict from one  layer  of code upon which some calculations modifications are performed before passing it onto another  layer   The original dict s keys  amp   string  values are unicode  but the layer they re being passed onto only accepts str   This is going to be called often  so I d like to know what would be the fastest way to convert something like     u spam   u eggs   u foo   True  u bar     u baz   97          to      spam    eggs    foo   True   bar      baz   97          bearing in mind the non- string  values need to stay as their original type   Any thoughts

User · Answer

If you wanted to do this inline and didn t need recursive descent  this might work   DATA     u spam   u eggs   u foo   True  u bar     u baz   97     print DATA      u spam   u eggs   u foo   True  u bar     u baz   97       STRING DATA   dict   str k   v  for k  v in data items     print STRING DATA       spam    eggs    foo   True   bar     u baz   97

User · Answer

for a non-nested dict  since the title does not mention that case  it might be interesting for other people    str k   str v  for k  v in my dict items

User · Answer

I know I m late on this one   def convert keys to string dictionary          Recursively converts dictionary keys to strings         if not isinstance dictionary  dict           return dictionary     return dict  str k   convert keys to string v            for k  v in dictionary items

User · Answer

def to str key  value       if isinstance key  unicode           key   str key      if isinstance value  unicode           value   str value      return key  value   pass key and value to it  and add recursion to your code to account for inner dictionary

User · Answer

To make it all inline  non-recursive     str k   str v  if isinstance v  unicode  else v  for k v in my dict items

User · Answer

gt  gt  gt  d    u quot a quot   u quot b quot   u quot c quot   u quot d quot    gt  gt  gt  d  u a   u b   u c   u d    gt  gt  gt  import json  gt  gt  gt  import yaml  gt  gt  gt  d    u quot a quot   u quot b quot   u quot c quot   u quot d quot    gt  gt  gt  yaml safe load json dumps d     a    b    c    d

User · Answer

DATA     u spam   u eggs   u foo   frozenset  u Gah      u bar     u baz   97             u list    u list    True  u Maybe    set  u and   u a   u set   1      def convert data       if isinstance data  basestring           return str data      elif isinstance data  collections Mapping           return dict map convert  data iteritems         elif isinstance data  collections Iterable           return type data  map convert  data       else          return data  print DATA print convert DATA    Prints     u list    u list    True  u Maybe    set  u and   u a   u set   1     u foo   frozenset  u Gah      u bar    u baz   97   u spam   u eggs       bar     baz   97    foo   frozenset   Gah       list     list    True   Maybe    set   and    a    set   1      spam    eggs     Assumptions    You ve imported the collections module and can make use of the abstract base classes it provides You re happy to convert using the default encoding  use data encode  utf-8   rather than str data  if you need an explicit encoding     If you need to support other container types  hopefully it s obvious how to follow the pattern and add cases for them

User · Answer

Just use print   dict keys      The   can be used for unpacking containers e g  lists  For more info on   check this SO answer

[python] Fastest way to convert a dict's keys & values from `unicode` to `str`?

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