# Python: Check whether a number is "happy" or not

## Python Basic - 1: Exercise-66 with Solution

From Wikipedia, the free encyclopaedia:

A happy number is defined by the following process:

Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers.

Write a Python program to check whether a number is "happy" or not.

**Sample Solution**:

**Python Code:**

```
def is_Happy_num(n):
past = set()
while n != 1:
n = sum(int(i)**2 for i in str(n))
if n in past:
return False
past.add(n)
return True
print(is_Happy_num(7))
print(is_Happy_num(932))
print(is_Happy_num(6))
```

Sample Output:

True True False

**Pictorial Presentation:**

**Flowchart:**

**Python Code Editor:**

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**Previous:** Write a Python program to find the longest word in set of words which is a subsequence of a given string.

**Next:** Write a Python program to find and print the first 10 happy numbers.

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