(25-06-21)PYTHON FUNDAMENTALS (PART-3)

 

BAREBONES OF A PYTHON PROGRAM :

1. Expression:
   Expression is evaluated and produces the results.
   Ex: (10=2)/2
2. Statements:
   Indicates that we are doing something.
   Ex: a=10
   print("Calling in proper sequence")
3. Comments:
   Comments are readable messages for a programmer but it is overlooked by the python interpreter.
   a. Single line comment (#)
   b. Multi-line comment (''' ''')
   Ex: #this is a single-line comment
   ''' this is
   multiple '''
4. Function:
   A function is a block of code which only runs when it is called. Ex: get Student Marks()

Block & Indentation:
A group of statements in block indentation at the same level creates a block. Ex: all the statements that are under the function get Student Marks()

VARIABLES AND ASSIGNMENTS :

A VARAIBLE IN PYTHON REPRESENTS NAMED LOCATION THAT REFERS TO A VALUE AND WHOSE VALUES CAN BE USED AND PROCESSED DURING PROGRAM RUN.

VARIABLES , CALLED SYMBOLIC VARIABLES , SERVE THE PURPOSE.

EG:-

AGE = 15

AGE IS VARIABLE AND 15 IS THE VALUE ASSIGNED TO IT .  

# A VARIABLE IS NOT CREATED UNTIL SOME VALUE IS ASSIGNED TO IT.

=>ASSIGNING SAME VALUES TO MULTIPLE VARIABLES :-

                    

A = B = C = 10

👆👆THIS WILL ASSIGN VALUE  1O    TO ALL THREE VARIABLES A , B AND C .

=>ASSIGNING MULTIPLE  VALUES TO MULTIPLE VARIABLES :-

X , Y , Z = 10 , 20 , 30

👆👆THIS WILL ASIGN THE VALUES ORDER WISE .I .E:-

X = 10 

Y = 20

Z = 30

SOME EXAMPLES ---

CODE:    X , Y = 25 , 50                    OUTPUT:   25  50   

                 print(X , Y )

 # HERE THE VALUE IS ORDER WISE ☝👀

CODE:   X , Y = Y , X                        OUTPUT:   50  25 

                print(X , Y )

# HERE THE VALUE IS REVERSED OF THE ABOVE CASE ☝👀