Hello World in Python-

A python program is called Script, It is a sequence of definitions and commands. These definitions are evaluated and commands are executed by the Python Interpreter, called Python Shell.

Python Syntax - refers to a set of rules that defines how users and the system should write and interpret a Python program.

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First Program in Python

Open IDLE, and type following commands in interactive mode-

>>> print(“Hello World!”)

Hello Programmer

>>> print(“Anjeev Singh welcomes you all”)

Anjeev Singh welcomes you all

>>> print(“In the world of Python Programming”)

In the world of Python Programming

>>> print(“Good Luck and Happy Programming”)

Good Luck and Happy Programming

 

Usint print( )

 

print( ) is function which is used to display the specified content on the screen. The content called argument is specified within the parentheses.

 

print( ) statement without any argument simply jump to the next line. Arguments are written inside the double or single quote and separated by comma.

Syntax of print( )

      print(values,..., sep=’  ’, end=’\n ’, file=sys.stdout, flush=False)

 

>>>print(10, 20, 30)     // space is default separator and ‘\n’ is the default end value.

10  20  30

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>>> print(10, 20, 30, sep=’*’)

10*20*30

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>>>print(“Anjeev”, “Singh”, “Academy”, sep=”-*-“)

Anjeev-*-Singh-*-Academy

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>>>print(“Anjev”,Singh”, sep=”#” end=”@Academy”)

Anjeev#Singh@Academy

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Python/IDLE as Calculator

Python has rich set of operators, like text/string message, we can also perform mathematical calculation using the Python command prompt [in Interactive Mode]. You can do it by typing the command directly at prompt and by using print( ) method.

            >>> 5 + 10

            15

            >>> 3.14 * 2 * 2

            12.56

            >>> 20/4 * 9 + 6 – 12

            39

            >>> print( 10+20)

            30

            >>> print(15/3*2-3)

            7

            >>> print(3.14 * 2 * 2)

            12.56

" To repeat the same command in Interactive Mode IDLE, press Alt + P or move the cursor in the same line and press Enter Key.

Exiting Python [IDLE] –

Type quit() or exit() function and press Enter Key.

>>> exit()

>>> quit()

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