Python

What is operator? Operator is nothing but symbols that perform certain task. Various set of operators in python:- 1)Arithmetic Operator a=50 b=5 print(a+b) print(a-b) print(a*b) print(a/b) print(a//b) print(a**b) 2)Relational Operator a=50 b=5 print(a<b) print(a>b) print(a<=b) print(a>=b) print(a==b) print(a!=b) 3)Logical Operator a=50 b=5 print(a<b and a>b) print(a>b or a<b) print(not(a<b and a>b)) 4)Bitwise Operator(applicable for int and bool value only) a=5 b=6 print(a&b) print(a|b) print(a^b) print(~b) print(a>>1) print(1<<b) 5)Assignment  Operator a=111 print(a) 6)Special Operator  Identity operator (is , is not)  Membership operator (in , not in) 

What is identifier? Identifier is nothing but name in python program. it can be class-name , function-name , variable-name , module-name. Allowed character  Alphate (uppercase or lowercase)  Digits (0-9)  Underscore ( _ ) var1=10 Var2=20 VAR_3=30 print(var1) print(Var2) print(VAR_3) Should not be start with digit. 1var=10 print(1var) SyntaxError: invalid decimal literal Case sensitive var1=10 print(VAR1) NameError: name 'VAR1' is not defined We can not use reserve word. True=20 print(True) SyntaxError: cannot assign to True

 What is dictionary? Dictionary is a data structure in which we represent a group of object as key value pair. Indexing & slicing not work. Insertion order is preserved. Heterogenous elements are allowed. Mutable in nature. Key must be unique but duplicates value are allowed. #Empty dictionary var={} print(type(var)) var=dict() print(type(var)) #Dictionary with item var={"Name":"Rishikesh","Age":"25"} print(var) #pop is use to delete item from dictionary var={"Name":"Rishikesh","Age":"25","cast":"obc"} var.pop("cast") print(var) var={"Name":"Rishikesh","Age":"25","cast":"obc"} print(var.pop("cast")) print(var) #get method use to get the value of the key var={"Name":"Rishikesh","Age":"25","cast":"obc"} print(var.get("cast")) print(var) #...

What is set? set is a data structure which is also called collection of item in which we can represent a group of unique value as a single entity.  we write the item of set inside the "curly braces {}". insertion order not preserved. indexing and & slicing not work. Heterogenous elements are allowed. Mutable in nature. Duplicate are not allowed. #empty set var=set() print(type(var)) #Set with item var={10,20,50.5,"rishi",True} print(type(var)) print(var) #add method for adding one item  var={10,20,50.5,"rishi",True} var.add("parisa") print(var) #update method for updating one or more item var={10,20,50.5,"rishi",True} var.update(["parisa","shiansh"]) print(var) #pop method for deleting item  var={10,20,50.5,"rishi",True} print(var.pop()) #remove method for deleting particular item  var={10,20,50.5,"rishi",True,"parisa"} var.remove("parisa") print(var) #clear method for clea...

 What is tuple? Tuple is a data structure which is also called collection of item in which we can store anything like string , float , integer. We write the item of the tuple inside "parenthesis ()" and each item separated by " comma ,". Duplicates are allowed. Immutable in nature.   1)Empty tuple 2)tuple with items 3)To find the length of the tuple use len. function. 4)copy 5)index= by using we can find out the index number of the item.

What is list? List is a data structure which is also called collection of item , in which we can store anything like (string,float,integar) We write the item of list inside " squared brackets[] " and each item separated by " comma , " Duplicates are allowed in list. Mutable in nature. 1)Create empty list 2)list with some values 3)indexing = indexing start with 01234  4)slicing = slicing work till -1  5)count = it is use to count present item in list. 6)index = it is  use to know location of the item in list. 7)insert = it is use to add item in list on particular position it required the index position and variable 8)pop = it is use to delete the item from the list  9)extend = it is use to add item at the end of the list 10)copy = Copy use to copy one list to another list 11)sort = sort is use to arrange list in ascending or descending order it work in only for numerical value. 12)reverse=it use to see list in reverse order. 13)Nested list = it is use to add list in...