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How to create Python dictionary from list of keys and values?
In Python, the dictionary is one of the built-in data types that stores the data in the form of key-value pairs. The pair of key-value is separated by a comma and enclosed within curly braces {}. The key and value within each pair are separated by a colon (:). Each key in a dictionary is unique and maps to a value. It is an unordered, mutable data.
Creating dictionary from lists
In Python, we can create a dictionary by using two separate lists. One list is considered as the keys, and the second one is considered as values. We use built-in function called zip() to pair the lists together according to their index positions. And the dict() function is used to convert zipped items into a dictionary.
my_list1={1,2,3,4,5} #list1 used for keys
my_list2={'one','two','three','four','five'} #list2 used for values
my_dict=dict(zip(my_list1,my_list2))
print("dictionary-",my_dict)
Following is the output of the above code -
dictionary- {1: 'two', 2: 'three', 3: 'five', 4: 'four', 5: 'one'}
Creating a dictionary from a single list
We can also create a dictionary from a single list. The index values are considered as keys, and the elements of the list are considered as the values of the dictionary.
my_list=['a','b','c','d']
dic={}
for i in range(len(my_list)):
dic[i]=my_list[i]
print(dic)
Following is the output of the above code -
{0: 'a', 1: 'b', 2: 'c', 3: 'd'}
Using enumerate() to Create a Dictionary
In Python, we have a built-in function called enumerate(), which returns an enumerate object when a list is passed as an argument.
This object generates pairs of index and corresponding list elements.
To create a dictionary from these pairs, we can pass the enumerate object to the dict() constructor.
my_list = ['One', 'Two', 'Three'] my_dict = dict(enumerate(my_list)) print(my_dict)
Following is the output of the above code -
{0: 'One', 1: 'Two', 2: 'Three'}
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