Python 3x fundamentals 1

Python: Python is a general-purpose high-level programming language.  Here high level means it is user friendly or programmer-friendly langu...

Python:

Python is a general-purpose high-level programming language. 

Here high level means it is user friendly or programmer-friendly language, not a machine friendly. This means the Programmer does not need any coding language.

NOTE: Father of python is GUIDO VAN ROSSUM. He developed the python language in 1989 and made it public to available in 1991.

Why Name Python: He was a fan of a comedy show " The complete Monty python's circle ." so he took name Python.

Python is All-Rounder: what does it mean? 

C language is a functional language 

C++, JAVA is an object-oriented programming language 

Perrl, Shell script is a scripting language.

 But python supports all languages, all right Now we will see from who python borrowed which language,

• Functional language from C 
• OOPS from C++ ( JAVA developed in 1995)
• script language from perrl 
• Modular PL from Modula-3.

Most of the syntax borrowed from C and ABC language.

Uses Of python:

1. Desktop Applications; ex. calculator development 
2. Web applications: ex- G-mail, E-commerce ( zomoto is developed on python)
3. Network Applications; like chatting applications 
4. Games 
5. Data Science, Machine Learning 
6. ML, AI, IoT, Neural networks etc.

Users of Python:

1. Google( youtube)
2. yahoo
3. Netflix
4. NASA etc

Features of Python;

1. Easy to use: It means No pre-knowledge required to learn python 
2. Freeware and open-source: Freeware means it is available free of cost. Open source means there anyone can use it with their name.
3. High-Level PL: means it is programmer-friendly, not machine friendly, that means do not require many codes.
4. Platform Independent: It means we can run the same programme on Windows, Linux or mac 
5. Portability: one programme can be migrated from one platform to another.
6. Dynamically typed 
7. Both procedure-oriented and object-oriented 
8. Interpreted 
9. Extensible: we can programme in C or C++ or JAVA 
10. Embedded: This means we can use python programmes in other languages.
11. Extensive Libraries  

Limitations of python:

1. mobile applications development: python is not suitable for mobile applications developments because the library is not available

2. Extensive applications: for example Banking applications, Telecom applications etc.,

3. Performance is poor: ' Just in time' and python virtual machine is used as a flavour for speed.

Python Identifiers :

Identifiers are just named for example class, variables etc.

Rules for identifiers :

1. only words are allowed, special character are not allowed  for example:

               cash=20 allowed 

                cas&h= 20 not allowed 

2. Identifiers should not start with a digit 

         ex;  345total= 20 , not allowed

                total345= 20, allowed 

3. No length limit but not recommended too length; ex  aaaaaaaaasssssssssssssjjjjjjjjjjjjjjjjkkkkkkkkkkkkk=20 allowed but not recommended 

4 We can not use keywords as identifiers: There are 33 reserved words

Reserved words or keywords: 

The words which are reserved to represent some functionality is called...

There is 33 reserved word :

1. True
2. False 
3. None 
4. and
5. or
6. not
7. is
8. If 
9. elif
10. else
11. while
12. for 
13. break
14. continue
15. in
16. yield
17. try
18. except
19. finally
20. raise 
21. assert
22. Import 
23. from 
24. as
25. class
26. def
27. pass
28. global
29. nonlocal
30. lemda
31. del
32. with 

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