Variables-in-Python

Know about Variables in Python

VARIABLES Variables are names or labels that reference value stored in a memory. it allow you to hold data and manipulate it within a program.

    x =  10
    name = "Leo" 

naMe , Name , name are different variables, so -- Python is Case-sensitive. python automatically save it as string, because we use double / single - quotation here variable is X and name. Must start with a letter or an underscore (_)

  print(type(x))
  print(type(name))

Data Types:

1. Integers A whole number, positive or negative, without a decimal point. Example: 10, -5, 0, 99999

2. String A sequence of characters (letters, numbers, symbols, spaces) enclosed in single quotes ('...'), double quotes ("..."), or triple quotes ("""..."""). Example: "Hello World", 'Python', "123 Main St"

3. Float A number, positive or negative, that contains one or more decimal points. These are also known as "floating-point numbers." Use: Calculations involving division, percentages, temperatures, or currency. Example: 3.14, -0.01, 2.0 (Note: 2.0 is a float, while 2 is an integer).

4. Boolean A data type that can only have one of two values: True or False. (Note the capital 'T' and 'F'). Use: Representing truth values, controlling program flow (e.g., in if/else statements), and evaluating conditions. Example: True, False

5. None A special constant that represents the absence of a value or a null value. It is its own unique data type (NoneType). Use: Used to indicate that a variable has not been assigned a specific value yet, or as a default return value for functions that don't explicitly return anything.

   num = 10
   num=num+10
   print(num)
   

it can also be written as

   num = 10
   num+=10
   print(num)


   a=10
   a*=5
   print(a)

Logical Operators

   print(not True) #not will convert true into false and false into true
   print(not False)

Create variables for your name, age, and favorite color. Print them using f-string formatting.

   name = 'Bhanu'
   Age = '32'
   Favourite_colour = "Green"
   message = f"My name is {name.title()}, my age is {Age}, and My favourite_colour is {Favourite_colour.title()}."
   print(message)

Assign values to two variables and swap their values without using a third variable.

 First_Name = "Bhanu"
 last_Name = "Partap"
 First_Name , last_Name = last_Name , First_Name
 message = f"First_Name = {First_Name} , last_Name = {last_Name}"
 print(message)

Assign values to three variables in a single line, then modify two of the variables and print all three.

a,b,c = 4,5,6
a+=2
b+=1
print(a,b,c)

VARIABLES

Bhanu = "I am a Artificial Intelligence Engineer"

print(Bhanu.endswith("eer")) 

if string ending with eer, it will return True.

print(Bhanu.capitalize()) 

It will capitalize only the first letter of a string.

print(Bhanu.title()) 

It will capitalize all the first letter of every word in a string.

print(Bhanu.replace("Arificial Intelligence","Data Science")) 

It will replace the coder with Data Scientist within a string.

print(Bhanu.count("A")) 

It will tell how many times a appear in the string.

print(Bhanu.find("I")) 

It will give the index number of l within a string.

print(Bhanu.index("Artificial Intelligence")) 

it will give the index number of l within a string. The difference is that .find() returns -1 if the substring is not found, whereas .index() raises a ValueError if the substring is not found.