We will learn here how to write and run python programs. Before you start, you should have Python installed on your computer.
Install Python and IDLE
Python comes pre-installed with Ubuntu and Mac OS, but it does not come pre-installed with the Windows operating system. You need to download and install manually from the official website of python https://www.python.org/downloads/. and install it in very simple steps.
IDLE: Python IDLE (Integrated development and learning environment ) is an integrated environment for python programming. IDLE is a simple IDE and suitable for beginners and an educational environment. For window users, it is a part of the python software, you need not install it separately. For Linux user, run below command in Terminal.
sudo apt-get install python3 idle3.Python Version Check
Run below command from terminal or cmd to check python installed on your PC and version of python.
python --versionWorking in Python.
Now python is installed in your PC, and you are ready to work with python environment. You can work in Python in two different ways.
- Interactive mode
- Script mode
Interactive mode – In interactive mode, you can run python command and you can use python as a calculator. You can execute one command at a time only, after every execution it produces the
Script mode – Here you can write multiple lines of code as a file with a
Python as a Calculator
We can use Python as a calculator. to use python as a calculator we will use the interactive mode of python.
For Interactive mode, you need to open Python IDLE from start menu in Window: Start -> Program -> Search IDLE
Mac or Ubuntu: Type IDLE3 in your terminal window.
The above command will open the Python shell, you can write any complex calculation.
Python 3.4.3 (default, Nov 12 2018, 22:20:49)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
You can see the symbol (>>>), where you can write calculation, python will print result.
Some More Examples
>>> 12+12
24
>>> 12+12*12
156
>>> (12+12)*12
288
Arithmetic Operators
>>> 10+3 # Print Addition
13
>>> 10-3 # Print Subtraction
7
>>> 10*3 # Print Multiplication
30
>>> 10/3 # Floating Divison
3.3333333333333335
>>> 10//3 # Integer Divison
3
>>> 10%3 # Modulus, Return Remainder
1
>>> 10**3 # Exponent, Cube of 10
1000