Iterate through all distinct dictionary values in a list of dictionaries

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Assuming a list of dictionaries, the goal is to iterate through all the distinct values in all the dictionaries.


d1={'a':1, 'c':3, 'e':5}
d2={'b':2, 'e':5, 'f':6}

The iteration should be over 1,2,3,5,6, does not matter if it is a set or a list.

You can use set with a comprehension:

d1 = {'a':1, 'c':3, 'e':5}
d2 = {'b':2, 'e':5, 'f':6}
L = [d1, d2]

final = set(j for k in L for j in k.values())
# {1, 2, 3, 5, 6}

Different ways to Iterate / Loop over a Dictionary in Python , It returns a iterable View object of all key,value elements in the dictionary. Its backed by original dictionary. Let's iterate over the list using dict.iter()  Python | Iterate through value lists dictionary. While working with dictionary, we can have a case in which we need to iterate through the lists, which are in the keys of dictionaries. This kind of problem can occur in web development domain. Let’s discuss certain ways in which this problem can be solved. Method #1 : Using list comprehension.

You can use set.union to iterate over distinct values:

res = set().union(*(i.values() for i in (d1, d2)))

# {1, 2, 3, 5, 6}

How to Iterate Through a Dictionary in Python – Real Python, Dictionaries map keys to values and store them in an array or collection. are much like a set , which is a collection of hashable and unique objects. new iterator object that can iterate through all the objects in the container. If you use a list comprehension to iterate through the dictionary’s values, then you’ll get code that is more compact, fast, and Pythonic: >>> incomes = { 'apple' : 5600.00 , 'orange' : 3500.00 , 'banana' : 5000.00 } >>> total_income = sum ([ value for value in incomes . values ()]) >>> total_income 14100.0

Python, Sometimes, while working with Python dictionaries, we can have a problem in which we need to find the unique values over all the dictionaries in a list. us to get the unique of them, and dictionary comprehension to iterate through the list. Surprisingly enough, it's not all that different to iterate over a list of dictionaries. for dict_entity in dict_list: will handle each individual dictionary in the list of dictionaries just as if they were individual items in a list or any other iterable.

Simple solution using itertools.chain and a generator expression:

from itertools import chain

set(chain.from_iterable(d.values() for d in l))

Python, In this, we just iterate over the list of dictionary for desired value. In this, map is used to link the value to all the dictionary keys and itemgetter gets the desired  This function iterate over all the key value pairs in dictionary and call the given callback function() on each pair. Items for which callback() function returns True are added to the new dictionary. In the end new dictionary is returned. Now let’s use this to filter a dictionary by key i.e.

print list(set().union(a, b))

Pretty straight forward

Python Dictionaries - Python Pandemonium, In addition to being unique, keys are also required to be hashable. We passed a sequence, in this case a list of key-value tuples, to the dict() data in to a list of dictionaries, then we'll iterate through all the dictionaries and print out the keys  In this article, we show how to iterate through all values of a dictionary in Python. So, say, we have a dictionary. This can be any dictionary. A dictionary contains key-value pairs. Each key contains a value. Let's say, however, that we don't want the keys but only the values in this particular instance.

Python Tutorial: Dictionaries, Tutorial on Dictionaries in Python: Operators and Methods of the Dictionary class. If we want to get the population of one of those cities, all we have to do is to use the name of Only immutable data types can be used as keys, i.e. no lists or dictionaries can be No method is needed to iterate over the keys of a dictionary​:. A Dictionary class is a data structure that represents a collection of keys and values pair of data. The key is identical in a key-value pair and it can have at most one value in the dictionary, but a value can be associated with many different keys. More about. C# Dictionary Dictionary Versus HashTable. Dictionary is a generic type

How to iterate through a python dictionary, Convert list of tuples(Key,Value) into a dictionary Python supports a concept of iteration over containers and An iterator needs to define two methods: The objects returned by dict.keys(), dict.values() and dict.items() are view objects. The final dictionary have all the keys with values greater than 500. In this tutorial, learn how to loop through dictionary elements in Python. To loop or iterate over each element of a dictionary variable, you have to use the for loop of Python. You can get the dictionary variable keys and values in the output. Use the for loop of the Python and use only keys or values in your programming.

Dictionaries - PY4E, In a list, the index positions have to be integers; in a dictionary, the indices can be that maps from English to Spanish words, so the keys and the values are all strings. Each time through the loop, if the character c is not in the dictionary, we​  Now let’s see how to iterate over this dictionary using 2 different techniques i.e. Iterate over the dictionary using for loop over keys | “for in dictionary” By using for in dictionary , it loops through all the keys in dictionary and for each key select the value and prints it.