## Create a dictionary from two lists in python :

In this python programming tutorial, we will learn how to create a dictionary from two different user input lists. Our program will ask the user to enter the values for both lists and then it will create one dictionary by taking the values. Values of the first list will be the *key* of the dictionary and corresponding values of the second list will be the *value* of the dictionary. Let’s take a look at the program :

### Python program :

#1 first_list = [] second_list = [] #2 first_list_size = int(input("Enter total elements for the first list : ")) second_list_size = int(input("Enter total elements for the second list : ")) #3 for i in range(first_list_size): first_list.append(input("Enter value for the first list : ")) #4 for i in range(second_list_size): second_list.append(input("Enter value for the second list : ")) #5 print("Your first list : ",first_list) print("Your second list : ",second_list) #6 combined_dict = dict(zip(first_list,second_list)) #7 print("Final dictionary : ",combined_dict)

### Explanation :

*The commented numbers in the above program denote the step number below :
*

1. Create two empty lists

*first_list*and

*second_list*to store the values for the keys and values of the dictionary.

2. Ask the user to enter the size of both the lists. Read and store them in

*first_list_size*and

*second_list_size*variables.

3. Run one

*for loop*. Take the values for the first list from the user and store them in

*first_list*list.

4. Similarly, using one

*for loop*, read and store the values for the second list in

*second_list*variable.

5. Print out both lists to the user.

6. Using

*zip()*, create one list of pairs from the lists. Then using

*dict()*, convert that list of pairs to a dictionary.

7. Print out the created dictionary.

### Sample Output :

Enter total elements for the first list : 3 Enter total elements for the second list : 3 Enter value for the first list : 1 Enter value for the first list : 2 Enter value for the first list : 3 Enter value for the second list : first Enter value for the second list : second Enter value for the second list : third Your first list : ['1', '2', '3'] Your second list : ['first', 'second', 'third'] Final dictionary : {'1': 'first', '2': 'second', '3': 'third'} Enter total elements for the first list : 3 Enter total elements for the second list : 5 Enter value for the first list : one Enter value for the first list : two Enter value for the first list : three Enter value for the second list : sunday Enter value for the second list : monday Enter value for the second list : tuesday Enter value for the second list : thursday Enter value for the second list : friday Your first list : ['one', 'two', 'three'] Your second list : ['sunday', 'monday', 'tuesday', 'thursday', 'friday'] Final dictionary : {'one': 'sunday', 'two': 'monday', 'three': 'tuesday'} Enter total elements for the first list : 3 Enter total elements for the second list : 2 Enter value for the first list : 1 Enter value for the first list : 2 Enter value for the first list : 3 Enter value for the second list : one Enter value for the second list : two Your first list : ['1', '2', '3'] Your second list : ['one', 'two'] Final dictionary : {'1': 'one', '2': 'two'}

### Conclusion :

Zipping is the easiest way to convert two lists to a dictionary. The first example we have shown above is a simple one, but the second and third examples are a little bit different. Both have different numbers of items in the lists. You can see that the final dictionary doesn’t contain all items.*zip()* ignores the items of a list if it doesn’t have anything corresponding in the other list. Go through the example and drop a comment below if you have any queries.

You might also like :

- Python 3 Ordered Dictionary (OrderedDict) with example
- How to delete a key from a python dictionary
- Python program to concatenate two dictionaries
- Python program to print all even numbers in a range
- Python program to count the total number of lines in a file
- Logical operators in Python : Explanation with example