Python 1st lecture

 Q- how to Print Hello World

print("Hello World")

Variables in python -------

age = 30   #variable should be intutive so that we can learn any time

print(age)

Note: Shift+Enter is shortcut to run command

2) '#' this is for writing the comment in python

Rules for Variables---

• Variable can not be start with any number like - 1age 
• Number can use in between and end with variable like - age1 age2
• Special characters are not allowed expect _ (underscore) like - age_my
• Space not allowed in variable 
• Python is case sensitive 

Way to define Variable ---

age1,age2 = 30,25 

age1 = 30

age2 = 25

age1=age2=30   #if 30 age for both variable  

>> Data type

the type of data is basically data type

• Integer = age1 to age3 is basically integer   , Integer is basically full number
  lets check = type(age1)  #it will give u print int
• float= basically decimal values
  Interest =  30.24
  type(Interest) #answer is float
• Message = Sequence of character is basically and type will be string ,Note: If we are using quote "" the it will string
  Message="My Name Is Divyanshu"   
  type(Message) #print will str  #we can use any quote 'I can use this'  ,   "also use this" but whenever we've multiline string then will use '''triple quote'''
• Boolean = 2 values are available here True and False
  Like = data = False  #here data is basically variable and false is data type
  type(data) #give u type of data, print bool
  bool

>> Mathematical Operator

• Addition = + 
  num1 =  20
  num2 = 37
  result = num1+num2 
  print(result)  #/another way direct: print(num1+num2), without storing data on new var
• Substraction = -
  num1 = 50
  num2 = 20
  result = num1-num2
  print(result) #/another way direct: print(num1-num2), without storing data on new var 
• Multiplication = *
  num1 = 20
  num2 = 39
  result = num1 * num2
  print(result)  #/another way direct: print(num1*num2), without storing data on new var 
• Integer Division = //   #this is basically integer division
  num1 = 20
  num2 = 3
  result = num1 // num2
  print(result)  #/another way direct: print(num1//num2), without storing data on new var
  answer = 6, bcse it will not give u float value
• Float Division = /  #this is basically float division
  num1 = 20
  num2 = 3
  result = num1 / num2
  print(result)  #/another way direct: print(num1/num2), without storing data on new var
  answer = 6.66666666667 , bcse it is float division
• Power = **
  num1 = 2
  num2 = 5
  result = num1 ** num2
  print(result)
• Modulus = % #it will give u remainder 
  num1 = 20
  num2 = 3
  result = num1 % num2
  print(result)
  answer =  2 , it is remainder

>> How to take input from user

age1 = input()  #by default it will string type data 

• to give age1 type so we've to typecast here 
• age1 = int(input())