Python Program to Generate a Dictionary that Contains Numbers (between 1 and n) in the Form (x,x*x).

When it is required to generate a dictionary that contains numbers within a given range in a specific form, the input is taken from the user, and a simple 'for' loop is used. This creates key−value pairs where each number maps to its square.

Example

Below is a demonstration for the same −

my_num = int(input("Enter a number.. "))
my_dict = dict()
for elem in range(1, my_num + 1):
    my_dict[elem] = elem * elem
print("The generated elements of the dictionary are : ")
print(my_dict)

Output

Enter a number.. 7

The generated elements of the dictionary are :
{1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49}

Alternative Methods

Using Dictionary Comprehension

A more concise approach using dictionary comprehension −

n = 7
square_dict = {x: x * x for x in range(1, n + 1)}
print("Dictionary using comprehension:")
print(square_dict)

Dictionary using comprehension:
{1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49}

Using zip() and range()

Another approach combining zip() with range() −

n = 5
numbers = range(1, n + 1)
squares = [x * x for x in numbers]
result_dict = dict(zip(numbers, squares))
print("Dictionary using zip:")
print(result_dict)

Dictionary using zip:
{1: 1, 2: 4, 3: 9, 4: 16, 5: 25}

Explanation

• The number is taken as user input.
• An empty dictionary is created.
• The number is iterated over using range(1, my_num + 1).
• The square of each number is stored as the value in the dictionary.
• The result is displayed on the console.

Comparison

Conclusion

Dictionary comprehension provides the most concise solution for creating number−square mappings. Use the for loop approach for better readability, especially when learning Python fundamentals.