How to store a list as a dictionary - python

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I know how to store in a list but how do I store these values as a dictionary instead?

    items = []
    for a in range(10):
        for b in range(10):
            if function() == condition:
    for a,b in oldItems:
        items[a][b] = RIGHT

So far I have come to the conclusion that I could store items as items = {} but I don't know how to duplicate the .append method with a dictionary. Nor do I know how to access a dictionary like items[a][b] does. Any suggestions?

Declaring a dictionary:

dictionary = {}

Adding to a dictionary:

dictionary[newkey] = newvalue

Accessing a dictionary:

print (dictionary[newkey])



Python Dictionary, Declaring a dictionary: dictionary = {}. Adding to a dictionary: dictionary[newkey] = newvalue. Accessing a dictionary: print (dictionary[newkey]). 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.

One major difference between a dictionary and a list is that dictionaries have "keys" while lists have "indices". So instead of .append(), you need to assign the value to a specific key, like this:

items = {}
for a in range(10):
    items[a] = []    # items[a] creates a key 'a' and stores an empty list there
    for b in range(10):
        if function() == condition:
for a, b in oldItems:
    items[a][b] = RIGHT

Take a look at the docs on dict, as well as some tutorials on beginner Python programming.

Using dictionaries to store data as key-value pairs, The real power of Python lists can be better appreciated when we use them to store more complex data structures than integers, floats, or strings. 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 ().

 #take input from User
    N = int(raw_input())

 #declare a dictionary
    dictn = {}

    for _ in range(N):
            SplitInput = raw_input().split()
            keyValue, ListValues = SplitInput[0], SplitInput[1:]
            ListValues = map(float, ListValues)
            dictn[keyValue] = ListValues
    print dictn

    FirstKey 11 12 13
    SecondKey 45 46 47
    ThirdKey 67 68 69

    {'SecondKey': [45.0, 46.0, 47.0], 'ThirdKey': [67.0, 68.0, 69.0], 'FirstKey': [11.0, 12.0, 13.0]}

How to add a list to a Python dictionary, That would add an empty list, whose key is “myList”, to the dictionary “myDict”. You could also use the dict “update” method, as follows: myDict.update(  This module reads and writes to a config/ini file and (at least in Python 3) behaves in a lot of ways like a dictionary. It has the added benefit that you can store multiple dictionaries into separate sections of your config/ini file and recall them. Sweet! Python 2.7.x example.

How to store a list as a dictionary - python, General tutorials on Python's dictionaries appear at One simple approach would be to store a list of (key, value) pairs, and then search the list  A shelf is a persistent, dictionary-like object. The difference with “dbm” databases is that the values (not the keys!) in a shelf can be essentially arbitrary Python objects — anything that the pickle module can handle. This includes most class instances, recursive data types, and objects containing lots of shared sub-objects.

Manipulating Lists and Dictionaries in Python, Extend the list by appending all the items in the given list. The main operations on a dictionary are storing a value with some key and  Browse other questions tagged python dictionary for-loop store or ask your own question. Blog The Overflow Newsletter #3 – The 36 pieces of code that changed history

Why Lists Can't Be Dictionary Keys, In Python, a dictionary is a built-in data type that can be used to store data in a way thats different from lists or arrays. Dictionaries aren't  I get a KeyError, because d[] isn't a list. In this case, I can add the following code after the assignment of a to initialize the dictionary. for x in range(1, 4): d[x] = list() Is there a better way to do this? Lets say I don't know the keys I am going to need until I am in the second for loop. For example: