Single vs double quotes in JSON

Question

My code   import simplejson as json  s      username   dfdsfdsf     1  s      username   dfdsfdsf     2 j   json loads s     1 definition is wrong   2 definition is right  I heard that in Python that single and double quote can be interchangable  Can anyone explain this to me

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import ast  answer   subprocess check output PYTHON    command  shell True  strip       print ast literal eval answer decode UTF       Works for me

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import json data   json dumps list  print data    The above code snippet should work

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you can use ast literal eval     gt  gt  gt  import ast  gt  gt  gt  s      username   dfdsfdsf     gt  gt  gt  ast literal eval s    username    dfdsfdsf

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As said  JSON is not Python syntax  You need to use double quotes in JSON  Its creator is  in- famous for using strict subsets of allowable syntax to ease programmer cognitive overload     Below can fail if one of the JSON strings itself contains a single quote as pointed out by  Jiaaro  DO NOT USE  Left here as an example of what does not work   It is really useful to know that there are no single quotes in a JSON string  Say  you copied and pasted it from a browser console whatever  Then  you can just type  a   json loads  very long json string pasted here     This might otherwise break if it used single quotes  too

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You can fix it that way   s      username   dfdsfdsf    j   eval s

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Two issues with answers given so far  if   for instance  one streams such non-standard JSON  Because then one might have to interpret an incoming string  not a python dictionary      Issue 1 - demjson  With Python 3 7   and using conda I wasn t able to install demjson since obviosly it does not support Python  3 5 currently  So I need a solution with simpler means  for instance astand or json dumps   Issue 2 - ast  amp  json dumps  If a JSON is both single quoted and contains a string in at least one value  which in turn contains single quotes  the only simple yet practical solution I have found is applying both   In the following example we assume line is the incoming JSON string object     gt  gt  gt  line   str   abc   008565   name   xyz   description   can control TV  s and more      Step 1  convert the incoming string into a dictionary using ast literal eval   Step 2  apply json dumps to it for the reliable conversion of keys and values  but without touching the contents of values    gt  gt  gt  import ast  gt  gt  gt  import json  gt  gt  gt  print json dumps ast literal eval line      abc    008565    name    xyz    description    can control TV s and more     json dumps alone would not do the job because it does not interpret the JSON  but only see the string  Similar for ast literal eval    although it interprets correctly the JSON  dictionary   it does not convert what we need

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I recently came up against a very similar problem  and believe my solution would work for you too  I had a text file which contained a list of items in the form     first item    the  Second  item    thi rd    some    hellish      quoted  item     I wanted to parse the above into a python list but was not keen on eval   as I couldn t trust the input  I tried first using JSON but it only accepts double quoted items  so I wrote my own very simple lexer for this specific case  just plug in your own  stringtoparse  and you will get as output list   items     This lexer takes a JSON-like  array  string and converts single-quoted array items into escaped double-quoted items   then puts the  array  into a python list  Issues such as    item 1       item 2 including those double quotes       item 3   are resolved with this lexer items            List of lexed items item             Current item container dq   True        Double-quotes active  False- gt single quotes active  bs   0           backslash counter in item   False  True if currently lexing an item within the quotes  False if outside the quotes  ie comma and whitespace  for c in stringtoparse 1 -1      Assuming encasement by brackets     if c         if there are backslashes  count them  Odd numbers escape the quotes            bs   bs   1         continue                         if  dq and c       or  not dq and c          quote matched at start end of an item         if bs  amp  1  1     if escaped quote  ignore as it must be part of the item             continue         else     not escaped quote - toggle in item             in item   not in item             if item                  if item not empty  we must be at the end                 items     item       so add it to the list of items                 item                 and reset for the next item             continue                     if not in item   toggle of single double quotes to enclose items         if dq and c                   dq   False             in item   True         elif not dq and c                   dq   True             in item   True         continue     if in item   character is part of an item  append it to the item         if not dq and c                  if we are using single quotes             item    bs                   escape double quotes for JSON         else              item    bs          c         bs   0         continue   Hopefully it is useful to somebody  Enjoy

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It truly solved my problem using eval function   single quoted dict in string      key   value    key2    value2    desired double quoted dict   eval single quoted dict in string    Go ahead  now you can convert it into json easily print desired double quoted dict

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JSON syntax is not Python syntax  JSON requires double quotes for its strings

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You can dump JSON with double quote by    import json    mixing single and double quotes data     jsonKey    jsonValue   title    hello world      get string with all double quotes json string   json dumps data

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demjson is also a good package to solve the problem of bad json syntax  pip install demjson  Usage  from demjson import decode bad json    quot   username   dfdsfdsf   quot  python dict   decode bad json   Edit   demjson decode is a great tool for damaged json  but when you are dealing with big amourt of json data ast literal eval is a better match and much faster

[python] Single vs double quotes in JSON

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