Replacing items in a list in a dictionary with items from another dictionary

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I have the following dictionaries:

d1 = {"00f_5" :[1,2,3], "00f_6": [1,2,3]}

d2 = [{"marker":"00f_5",1: 'AAA'},{"marker":"00f_6", 1: 'CCC'},{"marker":"00f_5", 2:"AAC"}]

I would like the following output:

d1 = {"00f_5" :["AAA","AAC",3], "00f_6": ["CCC",2,3]}

I have tried multiple attempts, but I couldn't get it. Any help would be much appreciated.

You can build a dict that maps the marker to a sub-dict that maps numeric keys to the 3-letter codes, so that given a marker and a numeric key, you can use dict.get method to get the mapped code if it exists:

d = {}
for s in d2:
    d.setdefault(s['marker'], {}).update(s)
d1 = {k: [d[k].get(i, i) for i in l] for k, l in d1.items()}

so that given:

d1 = {"00f_5" :[1,2,3], "00f_6": [1,2,3]}
d2 = [{"marker":"00f_5",1: 'AAA'},{"marker":"00f_6", 1: 'CCC'},{"marker":"00f_5", 2:"AAC"}]

d1 will become:

{'00f_5': ['AAA', 'AAC', 3], '00f_6': ['CCC', 2, 3]}

Manipulating Lists and Dictionaries in Python, A list is a mutable, ordered sequence of items. As such A dictionary is a mutable, unordered set of key-value pairs where each key must be unique. Another built-in method, .sort() , allows us to sort the items in the list either� ''' Converting a list to dictionary with list elements as keys in dictionary using dict.fromkeys() ''' dictOfWords = dict.fromkeys(listOfStr , 1) dict.fromKeys() accepts a list and default value. It returns a dictionary with items in list as keys. All dictionary items will have same value, that was passed in fromkeys().

Although I will not give you the full program, you might try to understand and play with the following code:

d2 = [{"marker":"00f_5",1: 'AAA'},{"marker":"00f_6", 1: 'CCC'},{"marker":"00f_5", 2:"AAC"}]

for d in d2:
  for key, value in d.items():
    if key == "marker":
      marker = value
    else:
      reference = value
      content = key
  print("Marker: {}, Reference: {}, Content: {}".format(marker, reference, content))

Python: Replacing strings in a list with values, I am trying to iterate through the list of current field names and replace them with the values in the dictionary. I am trying to use the .replace()� The view object items doesn't itself return a list of sales items but it returns a view of sales's (key, value) pair. If the list is updated at any time, the changes are reflected on the view object itself, as shown in the above program.

I would not suggest overwriting the first dict. Just make a new one (d3).

Given

d1 = {"00f_5" :[1,2,3], "00f_6": [1,2,3]}

lst = [
    {"marker":"00f_5",1: 'AAA'}, 
    {"marker":"00f_6", 1: 'CCC'},
    {"marker":"00f_5", 2:"AAC"}
]

Code

d3 = {}
for d in lst:
    key = d["marker"]
    value = d1[key]
    for k, v in d.items():     
    if not isinstance(k, int):                         # skip to numeric keys
            continue
        if key not in d3:                              # fill missing entries
            d3[key] = value
        idx = k - 1
        d3[key][idx] = v                               # overwrite list item

d3
{'00f_5': ['AAA', 'AAC', 3], '00f_6': ['CCC', 2, 3]}

20. Dictionaries — How to Think Like a Computer Scientist: Learning , They map keys, which can be any immutable type, to values, which can be any Another way to create a dictionary is to provide a list of key:value pairs using� Actually I have another function that replaces elements according to reverse_subs = {v: k for k, v in subs.items()} Replacing list values with dictionary values.

Iterate over large list of lists and replace its elements, You're looping in incorrect order, take the advantage of the fact that dictionary provides O(1) lookups. So, you should loop over the list and� Python Add Item(s) to Dictionary. To add an item to an existing dictionary, you can assign value to the dictionary variable indexed using the key. In this tutorial, we shall learn how to add a new key:value pair to a Python Dictionary, with help of some well detailed Python programs. Syntax to Add key:value pair to Dictionary

15 things you should know about Dictionaries in Python, We can also create a dictionary using another dictionary in combination To access dictionary values, we cannot use a numeric index (as we do with lists or We can use a dictionary with the replace function to modify the� It accepts in iterable sequence of key value pairs that can be single key value pair or list of tuples or an another dictionary. For each entry in sequence, it will add the given key value pair in dictionary and if key already exists then it will update its value.

Python Dictionary, A dictionary in Python is a scrambled collection of objects. Unlike other data types such as a list or a set which has a single value field, the dictionary type stores a key along with its The same key can't have another value in the dictionary. When replacing an element in a list, the subscript is used to reference the target of the assignment statement, which is not the list but an element's position within it. T Although a list's elements are always ordered by position, it is possible to impose a natural ordering on them as well.

Comments
  • Please post what you have attempted so far, and where did you encounter problems. [SO]: How to create a Minimal, Complete, and Verifiable example (mcve).