Introduction of Python

Introduction of Python

Python is an interpreted object oriented high level programming language with dynamic semantics. Python Syntax is easy compared to other language .Python is a Free & open Source and Portable Language.

History of Python

·       👉 Python was introduced by Guido van Rossum in 1989 .

·    👉 First version of python in 1991 .

·    👉 In 1994 Python 1.0 was released with new features which map, filter and lambda.

·    👉 Python 2.x also add some more feature like comprehension garbage collection system .

·    👉 After Python 2.x Python 3.x released in 2008.

Features of Python

1. Easy to learn and implement

2. Open source

3. Extendable language

4. Expressive programming language 5.Board Standard library

6. Cross platform

7. Work on interpreter logic.

8. Multi paradigm language.

9. High level programming

10. GUI programming support.

               

Application of Python

·       👉 Network programming .

·   👉 Data analysis.

·   👉 Robotics .

·   👉 Website and application development .

·   👉 Desktop application game. 

·   👉 Development wave scrapping data. 

·   👉 Visualization scientific calculation. 

·   👉 Machine learning and artificial intelligence .

·   👉 3D applications development.

·   👉Audio and videos software development.

Fi      First Python Program-  

                                                  Print("Hello World")

                                                  

                                                  Output

                                                  Hello World

          Python Character Set

              Letter - A to Z, a to z

              Digits - 0 to 9 

              Special Symbols - +,-,*,/ Etc.

              Whitespaces - Blank Space, Tab, Carriage Return, Newline, Form feed

               

              Other Character - Python can Process all ASCII and Unicode Character as part of            

              data or literals.

          

            Variables

                      A variable is a name given to a memory location in a program.

                            Name ="Ad Computer Campus"   #string

                            Age =25  #Integer 

                           Price =45.67  # float

                           

                         Note :  Red Text is Variable and Blue Text is value.

                        Program 1

```                   Name="Ad computer campus"

                       Age= 25

                       Salary= 25000

                    Print("My name is :", Name)

P                  Print("My Age is: ", Age)

                    Print("My Salary is: ", Salary)

                   Output

                    My name is : Ad computer campus

P                  My Age is:  25

                    My Salary is: 25000

      Rules for Identifiers

1. Identifiers can be combination of uppercase and lowercase letters, digits or an underscore(_). So myVariable, variable_1, variable_for_print all are valid python identifiers.

2. An Identifier can not start with digit. So while variable1 is valid, 1variable is not valid.

3. We can't use special symbols like !,#,@,%,$ etc in our Identifier.

4. Identifier can be of any length.

Python keywords 

Python has a set of keywords that are reserved words that cannot be used as variable names, function names, or any other identifiers:

Keyword	Description
and	A logical operator
as	To create an alias
assert	For debugging
async	Define an asynchronous function
await	Wait for and get a result from an awaitable
break	To break out of a loop
case	Pattern in a match statement
class	To define a class
continue	To continue to the next iteration of a loop
def	To define a function
del	To delete an object
elif	Used in conditional statements, same as else if
else	Used in conditional statements
except	Used with exceptions, what to do when an exception occurs
False	Boolean value, result of comparison operations
finally	Used with exceptions, a block of code that will be executed no matter if there is an exception or not
for	To create a for loop
from	To import specific parts of a module
global	To declare a global variable
if	To make a conditional statement
import	To import a module
in	To check if a value is present in a list, tuple, etc.
is	To test if two variables are equal
lambda	To create an anonymous function
match	Start a match statement (compare a value against cases)
None	Represents a null value
nonlocal	To declare a non-local variable
not	A logical operator
or	A logical operator
pass	A null statement, a statement that will do nothing
raise	To raise an exception
return	To exit a function and return a value
True	Boolean value, result of comparison operations
try	To make a try...except statement
while	To create a while loop
with	Used to simplify exception handling
yield	To return a list of values from a generator