Python Learning and Interview - Imtiaz211/interviews GitHub Wiki

Learning for Interview Process

Python Function
- A function is a block of code which only runs when it is called.
- A lambda function is a small anonymous function. A lambda function can take any number of arguments, but can only have one expression.
- The power of lambda is better shown when you use them as an anonymous function inside another function.
  - lambda arguments : expression
  - x = lambda a, b : a * b
  - print(x(5, 6))
- You can pass data, known as parameters, into a function.
- A function can return data as a result with return statement
- function definitions cannot be empty, but if you for some reason have a function definition with no content, put in the pass statement to avoid getting an error.
- Function is defined using the def keyword
  - def my_function(fname):
    - print(fname + "Refresh")
  - Arbitrary Arguments, *args
    - def my_function(*kids):
      - print("The youngest child is " + kids[2])
    - my_function("Emil", "Tobias", "Linus")
List
- mylist = ["apple", "banana", "cherry"]
- Lists are used to store multiple items in a single variable.
- List items are ordered, changeable, and allow duplicate values.
- List items are indexed, the first item has index [0], the second item has index [1] etc.
- use the len() function
- List items can be of any data type i.e Str, bool, int, set,tuple etc.
- It is also possible to use the list() constructor when creating a new list.
- Array Methods
  - append(), clear(), copy(), count(), extend(), index(), insert(), pop(), remove(), reverse(), sort().
the indented block starts after the : symbol.
Comment start with #, multiline comment """ this is a comment """
Variables are containers for storing data values.
- Python has no command for declaring a variable.
- A variable is created the moment you first assign a value to it.
- Variables do not need to be declared with any particular type, and can even change type after they have been set.
- If you want to specify the data type of a variable, this can be done with casting.
- You can get the data type of a variable with the type() function.
- String variables can be declared either by using single or double quotes:
- Variable names are case-sensitive.
- A variable name must start with a letter or the underscore character
- A variable name cannot start with a number
- A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- Variable names are case-sensitive (age, Age and AGE are three different variables)
- A variable name cannot be any of the [Python keywords].
- Multi Words Variable Names
  - Camel Case
  - Pascal Case
  - Snake Case
Operator
- is Returns True if both variables are the same object x is y
- is not Returns True if both variables are not the same object x is not y
- in Returns True if a sequence with the specified value is present in the object x in y
- not in Returns True if a sequence with the specified value is not present in the object x not in y

Django Framework (Syllabus)

(1) Introduction to Django
(2) Difference between an App and Project.
(3) What are Migrations and Why we do that.
(4) Admin part (How to create Superuser in python).
(5) What are Views in Django URL Routing.
(6) What is Render and relative import.
(7) A overview of settings file in Django.
(8) How to configure Template.
(9) What are models.
(10) Models are Admin Linkup.
(11) Modelform creation.
(12) Form Validation.
(13) What is Context in Django.
(14) Form in a View.
(15) Custom Form.
(16) How to setup Email in our Projects.
(17) Static Files and Serving Static Files in Django.
(18) Bootstrap Grid System.
(19) Idea of CSS and Blocks.
(20) URL names as Links.
(21) How to add Authentication in Django Project with help of Registration Redux module.
(22) Authentication Links in Navigation Bar.
(23) Add Login Form in Bootstrap.
(24) Query Set Basics.
(25) How to render images and Videos on our site.

Multithreading in Python

(1) Multithreading with Python
(2) What is multithreading?
(3) Starting a New Thread
(4) The Threading Module
(5) Synchronizing Threads

Python Data Types

(1) Numeric Types:- int, float, complex
(2) Text Type:- Str data type and string operations
(3) Making Type:- dict
(4) Set Type:- set, forzenset
(5) Sequence Type:- Tuple, list, range
(6) Boolean Type:- bool
(7) Binary Type:- bytes, bytearray, memoryview
(8) None Type:- noneType

Python programe flow control

(1) Conditional blocks using if, else and elif
- By default, statements in the script are executed sequentially from the first to the last. Nested if, elif, else Conditions also applied.
  - Python uses the if keyword to implement decision control.
    - if [boolean expression]:
  - else Condition
    - the else condition can be optionally used to define an alternate block of statements to be executed if the boolean expression in the if condition evaluates to False.
  - elif Condition
    - Use the elifcondition is used to include multiple conditional expressions after the if condition or between the if and else conditions.
    - The elif block is executed if the specified condition evaluates to True.
      - price = 100
      - if price > 100:
        
        print("price is greater than 100")
      - elif price == 100:
        
        print("price is 100")
      - elif price < 100:
        
        print("price is less than 100")
(2) Simple for loops in python
- In Python, the for loop is used for iterating over sequence types such as [list], [tuple], [set], [range], etc. Unlike other programming language, it cannot be used to execute some code repeatedly.
  - for x in sequence:
    - statement1
    - statement2
    - ...
    - statementN
- The execution of the for loop can be stop and exit using the break keyword on some condition.
- Use the continue keyword to skip the current execution and continue on the next iteration using the continue keyword on some condition.
- For Loop with Else Block
  - The else block can follow the for loop, which will be executed when the for loop ends.
(3) For loop using ranges, string, list and dictionaries
(4) Use of while loops in python
- With the while loop we can execute a set of statements as long as a condition is true.
- remember to increment i, or else the loop will continue forever in while loop.
- The while loop requires relevant variables to be ready, in this example we need to define an indexing variable, i, which we set to 1.
- break, continue and else play same role in for loop, while loop.
  - i = 1
  - while i < 6:
    - print(i)
    - i += 1
(5) Loop manipulation using pass, continue, break and else
(6) Programming using Python conditional and loops block

Python Func�ons , Modules And Packages

(1) Organizing python codes using functions
(2) Organizing python projects into modules
(3) Importing own module as well as external modules
(4) Understanding Packages
(5) Powerful Lamda function in python
(6) Programming using functions,modules & external packages

Python Object Oriented Programming – OOPS

(1) Concept of class, object and instances
- Python is an object oriented programming language.
- Almost everything in Python is an object, with its properties and methods.
- A Class is like an object constructor, or a "blueprint" for creating objects.
  - To create a class, use the keyword class
    - class MyClass:
      - def init(self, name, age):
        
        self.name = name
        
        self.age = age
  - Objects can also contain methods. Methods in objects are functions that belong to the object.
  - Object Methods
  - Modify Object Properties
  - Delete Object Properties
  - Delete Objects
(2) Constructor, class attributes and destructors
(3) Real time use of class in live projects
(4) Inheritance , overlapping and overloading operators
(5) Adding and retrieving dynamic attributes of classes
(6) Programming using Oops support
- Python Inheritance
  - Inheritance allows us to define a class that inherits all the methods and properties from another class.
  - Parent class is the class being inherited from, also called base class.
  - Child class is the class that inherits from another class, also called derived class.

Python Learning and Interview - Imtiaz211/interviews GitHub Wiki

Python Function

List

Operator