Prime numbers are important in mathematics and computer science and are often used in cryptography and other applications that require unique keys or factors.

**What is Prime Number?**

A prime number is a positive integer greater than 1 that is only divisible by 1 and itself.

**How to Find Prime Number in Python**

To **find** **prime** **numbers **in **Python**, use the **for loop** to iterate over the range and check if each number is prime.

```
def is_prime(n: int) -> bool:
# Check if n is less than 2, which is not prime
if n < 2:
return False
# Check if n is divisible by any number from 2 to n-1
for i in range(2, n):
if n % i == 0:
return False
# If the loop completes without finding a divisor, n is prime
return True
print(is_prime(5))
```

**Output**

`True`

In this example, we are checking for the number 5, a prime number, and the program verifies that by returning True.

Let’s check for the number 4 and see if it is a prime number.

```
def is_prime(n: int) -> bool:
# Check if n is less than 2, which is not prime
if n < 2:
return False
# Check if n is divisible by any number from 2 to n-1
for i in range(2, n):
if n % i == 0:
return False
# If the loop completes without finding a divisor, n is prime
return True
print(is_prime(4))
```

**Output**

`False`

You can then use the **is_prime()** function to find the prime numbers.

**Python find prime numbers in range**

To find prime numbers in the range in Python, use list comprehension. The list comprehension will create a new list filled with prime numbers based on the existing list.

We will check every element in the range or this case, the existing list and see if it is a prime number or not by passing each value to the **is_prime()** function.

If the number between the range is prime, it will be added to the new list, and after iterating the range, we will have the final list of prime numbers.

We will create a **find_primes_in_range()** function to find all prime numbers between 1 and 50.

```
def is_prime(n: int) -> bool:
# Check if n is less than 2, which is not prime
if n < 2:
return False
# Check if n is divisible by any number from 2 to n-1
for i in range(2, n):
if n % i == 0:
return False
# If the loop completes without finding a divisor, n is prime
return True
def find_primes_in_range(start: int, end: int) -> list[int]:
# Use a list comprehension to find all prime numbers in the range
return [n for n in range(start, end + 1) if is_prime(n)]
prime_numbers = find_primes_in_range(1, 50)
print(prime_numbers)
```

**Output**

`[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]`

Here is the list of all the prime numbers from the range of 1 to 50 in Python.

**Conclusion**

The best way to find the prime number for a given range is to write a custom function that checks if that number is prime or not and then use the list comprehension technique to find the prime numbers from the given range.

That’s it.

Krunal Lathiya is a Software Engineer with over eight years of experience. He has developed a strong foundation in computer science principles and a passion for problem-solving. In addition, Krunal has excellent knowledge of Data Science and Machine Learning, and he is an expert in R Language. Krunal has experience with various programming languages and technologies, including PHP, Python, and JavaScript. He is comfortable working in front-end and back-end development.