How to change the keys of a dictionary?

Question

Let's say I have a pretty complex dictionary.

{'fruit':'orange','colors':{'dark':4,'light':5}} 

Anyway, my objective is to scan every key in this complex multi-level dictionary. Then, append "abc" to the end of each key.

So that it will be:

{'fruitabc':'orange','colorsabc':{'darkabc':4,'lightabc':5}} 

How would you do that?

Answer 1

Keys cannot be changed. You will need to add a new key with the modified value then remove the old one, or create a new dict with a dict comprehension or the like.

Answer 2

For example like this:

def appendabc(somedict):     return dict(map(lambda (key, value): (str(key)+"abc", value), somedict.items()))  def transform(multilevelDict):     new = appendabc(multilevelDict)      for key, value in new.items():         if isinstance(value, dict):             new[key] = transform(value)      return new  print transform({1:2, "bam":4, 33:{3:4, 5:7}}) 

This will append "abc" to each key in the dictionary and any value that is a dictionary.

EDIT: There's also a really cool Python 3 version, check it out:

def transform(multilevelDict):     return {str(key)+"abc" : (transform(value) if isinstance(value, dict) else value) for key, value in multilevelDict.items()}  print(transform({1:2, "bam":4, 33:{3:4, 5:7}}))