Writing your first Python 3 Program

Packages and Modules are used for organizing python application.Packages are represented as directories and modules are represented as single files.To use a module you need to import it first.

Before writing your first Python program you need to download Python 3 as we will be using Python 3 in these tutorials.After installing Python you need to set up environment on your computer.

You can use any text editor to write Python program.Sublime text can also be used for writing Python programs.

To create a new module in python follow the below steps

1.create a directory

create a python file having the extension .py.You can name the file anything just make sure it has the extension .py

Copy the following contents to the directory

def helloWorld():

  print('Hello from Python')

2.navigate to the above directory  using the command prompt

type “python” to start the python interpreter

import the module using the following command

import python_hello_world

instead of python_hello_world you need to use the name of the python file which you have created in step 1.

3.Call the function which you have defined in the above module

python_hello_world.helloWorld()

In this simple program we have used print() function.This is aa inbuilt function in Python.It just prints the string on screen.

To exit the Python interpreter on windows just press Ctrl+Z.

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