Running Python programs is very similar to Java, C, programs. Python can be run in different modes. It has different implementations like CPython, IronPython, Jython. Python Basic Syntax is very easy to learn and remember.
Interpreter or Shell mode
For Starting python shell in command line type below command on Windows or Linux:
Note: We mostly use
python3 command in Linux because there are two Python Versions installed in there. Above both commands will work but Python Version difference will be there.
It will generate output like this
Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:05:16) [MSC v.1915 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>>
Print Hello World in Python
Once you start python shell in windows or ubuntu type bellow program in the terminal.
How to Run Python File using Terminal
You can create file with extension
.py and run it in the terminal:
Rules for Initialising Variables or Identifiers in Python
A python identifier starts with A to Z or a to z or an underscore( _ ) followed by zero or more letters, underscores, and digits (0 to 9).
Allowed Identifiers: A, a, _a, _A123, _123, etc.
Not Allowed Identifiers: 123, $ads, etc.
How to Comment in Python
For single line comment in Python
""" for multiple line is used:
# single line comment """ Multiple Line Comment """
Line and Indentation
In Python, every Line is considered a new block of code and python does not use braces instead Indentation which means Indentation is very important
print('Five greater than 2')
Whats Next – Python Variables