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I'm working on a problem, and it would be much easier to solve if I had an elegant way to convert a multi dimensional list of n elements into a dictionary of keys corresponding with the index and values corresponding with the list values.

Example:

[[1,2,3],[4,5,6],[7,8,9]] => {0:[1,2,3], 1:[4,5,6], 2:[7,8,9]}

Is there a simple way to do this with Python?

Some steps follow you can convert your any kind of multi dimensional list into dictionary

Step 1 : call your list :

mylist =  [[1,2,3],[4,5,6],[7,8,9]] 

Step 2: stored dict variable name

mydict =  {}

for i in range(len(mylist)):
  mydict[i] = mylist[i]

print(mydict)

Result :

{0: [1, 2, 3], 1: [4, 5, 6], 2: [7, 8, 9]}

[Note : The result is tested ]

Efficiency: 2D-list to dictionary in python, Result : {0: [1, 2, 3], 1: [4, 5, 6], 2: [7, 8, 9]} Given a list, write a Python program to convert the given list to dictionary such that all the odd elements have the key, and even number elements have the value. Since python dictionary is unordered, the output can be in any order.

To expand on my comment:

>>> array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> {index: list(value) for index, value in enumerate(array)}
{0: [1, 2, 3], 1: [4, 5, 6], 2: [7, 8, 9]}

changed value to list(value) to avoid byref v. byval issues

Python, I want to convert the list into a dictionary where the second element serves as key . The value of each key should be a list of all first elements, that� Following conversions from list to dictionary will be covered here, Convert a List to Dictionary with same values; Convert List items as keys in dictionary with enumerated value; Convert two lists to dictionary; Convert a list of tuples to dictionary; Convert a List to Dictionary with same values. Suppose we have a list of strings i.e.

You can try using enumerate on the list:

new_dict = {}
for itr, ele in enumerate(array):
    new_dict[itr] = ele
return new_dict

There may be another solution that is a little less code but this should work for what you are trying to do, assuming the index should be the key.

EDIT:

{itr: ele for itr, ele in enumerate(array)}

Python - Convert Lists to Nested 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. As with most problems, merging two lists into a dictionary has many solutions. Let’s take a look at a few. Convert Two Lists with Zip and the Dict Constructor. Zip is a great functionality built right into Python. In Python 2, zip merges the lists into a list of tuples.

Python Program : How to Convert Lists into a Dictionary, Sometimes, while working with Python dictionaries, we can have a problem in which we need to convert list to nestings, i.e each list values representing new� Python | Convert two lists into a dictionary 28-11-2018 Interconversion between data types are usually necessary in real time applications as certain systems have certain modules which require the input in a particular data-type.

Python: Convert a list into a nested dictionary of keys, In this sample program, you will learn how to convert lists to a Python dictionary and show it using the print() function. Sometimes, while working with Python dictionaries, we can have a problem in which we need to convert list to nestings, i.e each list values representing new nested level. This kind of problem can have application in many domains including web development.

How do you convert two lists into a dictionary?, Python Exercises, Practice and Solution: Write a Python program to convert a list into a nested dictionary of keys. Dictionary comprehensions in Python is a cool technique to produce dictionary data structures in a neat way. Assume we have a list of cars in a list of lists format. We need to convert that into a dictionary format. For each list we extract the first item as the key and the rest of the items as the value list.

Comments
  • Yes, dict comprehension and enumerate.
  • Possible duplicate of Nested list to nested dictionary in python
  • With enumerate, this is easy. Try?
  • Hi, welcome to SO. I have a counter question for you to understand the better what you are trying to do. If you want to make dictionary like that and access the elements using key, you could do it from the list too, directly. So what is your final goal here?
  • It's ironic you picked the answer that didn't use enumerate
  • Careful: you need index: list(value) for the assignment if you want an actual copy, not just another reference.