How to convert list to dictionary in Python

Method - 1 Using Dictionary Comprehension

We can convert the list into dictionary using the dictionary comprehension.

Example -

student = ["James", "Abhinay", "Peter", "Bicky"]  
  
student_dictionary = { stu : "Passed" for stu in student }  
  
print(student_dictionary)  

Output:

{'James': 'Passed', 'Abhinay': 'Passed', 'Peter': 'Passed', 'Bicky': 'Passed'}

Explanation -

In the above code, we have created a student list to be converted into the dictionary. Using the dictionary compression, we converted the list in dictionary in a single line. The list elements tuned into key and passed as a value.

Example - 2

list1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]  
square_dict = {n: n*n for n in list1}  
print(square_dict)  

Output:

{1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81, 10: 100}

Explanation:

In the above code, we have created square_dict with number-square key/value pair.

Method - 2 Using zip() function

The zip() function is used to zip the two values together. First, we need to create an iterator and initialize to any variable and then typecast to the dict() function.

Example -

def Convert_dict(a):  
    init = iter(list1)  
    res_dct = dict(zip(init, init))  
    return res_dct  
  
  
# Driver code  
list1 = ['x', 1, 'y', 2, 'z', 3]  
print(Convert_dict(list1))  

Output:

{'x': 1, 'y': 2, 'z': 3}