Python scripts have .py file extension.

To run python script:

`python myscript.py`

To exit from the interpreter:

`quit()`

To direct the output of a script to a text file:

`python myscript.py > output.txt`

To access the value of PI:

`import math`

math.pi

To find the length of a string:

`len("hello")`

To concatenate two strings:

`'hello' + 'world'`

To search a substring:

`'welcome'.find('come')`

To replace all occurrences of one substring with another:

`'hahaha'.replace('h', 'n')`

**Python program to check if a number is prime**

```
factors = 0
n = int(input('Enter the number: '))
for i in range(1, n + 1):
if n % i == 0:
factors = factors + 1
if factors == 2:
print(str(n) + " is prime.")
else:
print(str(n) + " is not prime.")
```

**Python program to find the HCF of two numbers**

```
num1 = int(input('Enter first number: '))
num2 = int(input('Enter second number: '))
while num1 % num2 != 0:
rem = num1 % num2;
num1 = num2
num2 = rem
print('HCF is ' + str(num2))
```

**Python program to find the factorial of a number using a user-defined function**

```
def factorial(num):
f = 1
for i in range(1, num + 1):
f = f * i
return f
num = int(input('Enter the number: '))
fact = factorial(num)
print('Factorial is ' + str(fact))
```

Sir,how to run a java program in sublime text 3? What is the path to run the java program in sublime text 3?

Here is the link that has steps to execute Java from Sublime Text Editor.

How to write a python program in sublime text 3? Can you show me in sublime text?

Sir,a program is given which states that:

WAP in python to accept a number and check whether a number is prime or not.

Follow this page to check for prime numbers in python.