Introduction to Python

Python is interpreted:

Python is processed at runtime by the interpreter. No need to compile the program before executing it

Python is interactive:

Interaction can be made at the python prompt directly to write the programs

Python Interpreter mode (Script Mode)

• This mode is used to execute python program written in a file.
• Such a file is called a script
• Scripts can be saved to disk for future use.
• Python scripts have the extension .py
• To execute the file in script mode type filename.py in command prompt

firstprogram.py
print("Welcome all for python class")

Python Interactive mode

• Type python in the command prompt
• It will give the python interpreter prompt  i.e., “>>>” which is also known as python chevron prompt
• The >>> symbol indicates that python interpreter is waiting for an expression or command.
• The interactive environment where we are interacting with the python interpreter is called the console or command shell

>>> 8
8
>>> 8+1
9
>>> 8-1
7
>>> 8*2
16
>>> 8/2
4.0
>>> print("Hello")
Hello
>>> "Hello"
'Hello'

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