Interactive mode programming.

  Invoking the interpreter without passing a script file as a parameter.

  Scripting mode programming.

  Invoking the interpreter without passing a script file as a parameter.

  Python files have the extension .py. We should save the python file with .py extension.

Source code:(Interactive mode programming)

#Type python3 on terminal

$ python3

Python 3.7.0 (default, Oct 9 2018,
10:31:47)

[GCC 7.3.0] :: Anaconda custom
(64-bit) on linux

Type "help", "copyright", "credits"
or "license" for more information.

# After getting >>>, we can type
our codes

>>> a=5

>>> b=10

>>> c=a+b

>>> print(c)

15

Source code:
(Script mode programming)

#First save the file with .py
extension

#Second we should specify the path of
file where its actually stored

#program code

a=5

b=10

c=a+b

print("The addition of a+b is:",c)