Python nested dictionary and list concatnate dictionary keys with list values

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I have a nested dict as follows:

list = { "A" : [ "1", "2", "3" ], "B" :  [ "2" ], "C" : [ "1", "2" ] }

I want to concatenate dictionary keys and list values as follows:

[ "A.1", "A.2", "A.3", "B.2", "C.1", "C.2" ]

Any suggestions?

lst = {"A": ["1", "2", "3"], "B": ["2"], "C": ["1", "2"]}
result = ["{}.{}".format(key, val)
          for key, vals in lst.items()
          for val in vals]
print(result)

Python, Python | Split dictionary keys and values into separate lists · manjeet_04. Check out this Author's contributed articles. If you like GeeksforGeeks and would like  Let’s discuss string concatenation of like key values and ways to solve it in this article. Method #1 : Using dictionary comprehension + keys() The combination of above two can be used to perform this particular task.

You can try the following code:

list = { "A" : [ "1", "2", "3" ], "B" :  [ "2" ], "C" : [ "1", "2" ] }
data = []
for key, values in list.items():
    for value in values:
        data.append("{0}.{1}".format(key,value))
print(data)
# Output ['A.1', 'A.2', 'A.3', 'B.2', 'C.1', 'C.2']

Python, Python | Convert two lists into a dictionary For this, simply declare a dictionary, and then run nested loop for both the lists and assign key and value pairs to from list values to dictionary. Printing original keys-value lists Python | Convert string dictionary to dictionary · Python | Concatenate dictionary value lists · Python  How to Create Nested Dictionary in Python with 3 lists a be keys in the outer dictionary, and b and c the key and value Python. List to nested dictionary

new_list = []
for ks, vs in list.items():
    for v in vs:
        new_list.append('.'.join([ks, v]))

print(new_list)
# output
['A.1', 'A.2', 'A.3', 'C.1', 'C.2', 'B.2']

The Idiomatic Way to Merge Dictionaries in Python, Have you ever wanted to combine two or more dictionaries in Python? user values should override defaults values in cases of duplicate keys For concerns about mutability of nested objects, we should look into copy.deepcopy. What if we get a list of items from each dictionary, concatenate them, and  Python | Nested Dictionary. A Dictionary in Python works similar to the Dictionary in the real world. Keys of a Dictionary must be unique and of immutable data type such as Strings, Integers and tuples, but the key-values can be repeated and be of any type. Nested Dictionary: Nesting Dictionary means putting a dictionary inside another dictionary.

Do a loop with the pair values of the dictionary and append each individual value in the empty list.

How to Merge two or more Dictionaries in Python ? – thispointer.com, In Python, the Dictionary class provides a function update() i.e.. Python Merge dictionaries and keep values of common keys in list'''. Combine values of same keys in a list of dicts. Ask Question Asked 2 years, 6 months ago. Active 2 years, 6 months ago. merging several python dictionaries. 1.

Getting a key's value in a nested dictionary, Consider adhering more strictly to Python naming conventions. Fetching a list of values by key from a dictionary is a task that should work for  What is Python Nested Dictionary? A dictionary can contain another dictionary, which in turn can contain dictionaries themselves, and so on to arbitrary depth. This is known as nested dictionary. Nested dictionaries are one of many ways to represent structured information (similar to ‘records’ or ‘structs’ in other languages).

Nested defaultdicts in Python, While this requirement is rare, learning how to nest default dicts properly In Python, a dictionary is a key-value map, and the value can contain any type. This is also called list concatenation, and Python provides multiple  The set method in ( Setting a value in a nested python dictionary given a list of indices and value) seems more robust to missing parental keys. To copy it over: def nested_set(dic, keys, value): for key in keys[:-1]: dic = dic.setdefault(key, {}) dic[keys[-1]] = value

Python Tutorial: Dictionaries, Python programs or scripts without lists and dictionaries are nearly inconceivable​. how a dictionary can be turned into one list, containing (key,value)-tuples or two lists, i.e. one What about concatenating dictionaries, like we did with lists? Once you select the key whose value is a dict, then just use another set of brackets to access the nested dict, like so: [code]>>> nested_dict = { 'nested key&#039

Comments
  • Can you please show what you've tried Floris?
  • @ChristianDean I had tried almost exactly what Alex Hall is showing below but had omitted the second "for val in vals" part, makes sense!
  • Why not put the comp all on one line?
  • @ChristianDean because I find this more readable, and using as few lines as possible is not a good goal.
  • I'd have to disagree @Alex Hall. I think short, concise, and readable code is what one should aim for. One should try to avoid overly verbose code, as long as the code stays readable. Of course, your objection is that ["{}.{}".format(key, val) for key, vals in lst.items() for val in vals] isn't readable. I think it is, but if you disagree, that's fair enough. Nice answer, +1.
  • Google's Python Style Guide would say this is a no go: break it out into a proper loop.
  • This would benefit from improving the variable names: for x in v: is much less readable than for value in values:.