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

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

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Dictionaries in Python:

In Python, a dictionary dict is a one-to-one mapping; it includes a set of (key, value) pairs, with each key mapped to a value. It exemplifies a hash map or hash table (from Computer Science).

Each key denotes a value and is separated by a colon (:).

Curly brackets are used to define a dictionary. The value to the left of the colon is known as the key, while the value to the right of the colon is known as the value. A comma separates each (key, value) pair.

Examples:

Example1:

Input:

given number = 17

Output:

Enter some random number = 17
printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169
key = 14 value = 196
key = 15 value = 225
key = 16 value = 256
key = 17 value = 289

Example2:

Input:

given number=11

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121

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

There are several ways to generate a dictionary which contains numbers from 1 to n in the form ( x, x*x ) some of them are:

Method #1: Using Dictionary Comprehension (User Input)

Approach:

  • Scan the number and store it in a variable
  • Create a dictionary and use dictionary comprehension to populate it with values that have a number between 1 and given number as the key and the square of the number as their values.
  • Print the resultant dictionary
  • Exit of program

Below is the implementation:

# given number
numb = int(input("Enter some random number = "))
# using dictionary comprehension
resultdict = {k: k*k for k in range(1, numb+1)}
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key,value in resultdict.items():
    print("key =",key,"value =",value)

Output:

Enter some random number = 17
printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169
key = 14 value = 196
key = 15 value = 225
key = 16 value = 256
key = 17 value = 289

Explanation:

  • A number must be entered by the user and saved in a variable.
  • Using dictionary comprehension, a dictionary is declared and initialized with values.
  • The digits 1 to n are preserved as keys, while the squares of the numbers are used as values.
  • The final resultant dictionary is printed

Method #2: Using Dictionary Comprehension (Static Input)

Approach:

  • Give the number as static input.
  • Create a dictionary and use dictionary comprehension to populate it with values that have a number between 1 and given number as the key and the square of the number as their values.
  • Print the resultant dictionary
  • Exit of program

Below is the implementation:

# give the number as static
numb = 11
# using dictionary comprehension
resultdict = {k: k*k for k in range(1, numb+1)}
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key, value in resultdict.items():
    print("key =", key, "value =", value)

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121

Method #3:Using for loop (Static Input)

Approach:

  • Give the number as static input.
  • Take a empty dictionary
  • Traverse from 1 to given number using for loop.
  • For each iterator value initialize the key p with the value p*p where p is iterator value.
  • Print the resultant dictionary
  • Exit of program

Below is the implementation:

# give the number as static
numb = 13
# Take a empty dictionary
resultdict = {}
# using for to iterate from 1 to numb
for p in range(1, numb+1):
    resultdict[p] = p*p
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key, value in resultdict.items():
    print("key =", key, "value =", value)

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169

Explanation :

Here we assigned square of iterator value to the key  of the dictionary instead of using dictionary comprehension