Python Day -2

What Is Python : Python is an easy to understand ,general purpose programming language

Developed By Guido van Rossum.

Advantages Of Python:

• Easy To Code
• Improved Productivity
• Vast Library Support
• Lot Of Career Options
• Used ALmost Everywhere

Operators :

Expression = opreator + operand (X + Y ) here x and y are operands and + is operator

Defination Of Operator -- operators are special symbols, combinations of symbols, or keywords that designate some type of computation

Types Of Operator

• Arithmetic operators:

       Addition
x = 5
y = 3

print(x + y)
                           

       Subtraction
x = 5
y = 3

print(x - y)        

       Division
x = 12
y = 3

print(x / y)        

       Mod(%)
x = 5
y = 2

print(x % y)        

       Multiplication(*)
x = 5
y = 3

print(x * y)        

       Floor Division(//)
x = 15
y = 2

print(x // y)        

       To the power(**)
x = 2
y = 5

print(x ** y)         

• Assignment operators

= (x=3)

x = 5
print(x)        

+=(x+=3 same as x= x+3)

x = 5
x += 3
print(x)        

-=(x-=3 same as x = x-3)

x = 5
x -= 3
print(x)        

*=(x*=3 same as x = x*3)

x = 5
x *= 3
print(x)        

/=(x/=3 same as x = x/3)

x = 5
x /= 3
print(x)        

• Comparison operators

== (True If Equal),

x = 5
y = 3
print(x == y)
# returns False because 5 is not equal to 3        

!=(True If Not Equal)

x = 5
y = 3
print(x != y)
# returns True because 5 is not equal to 3
        

>(Greater Than)

x = 5
y = 3
print(x > y)
# returns True because 5 is greater than 3        

<(Less Than)

x = 5
y = 3
print(x < y)
# returns False because 5 is not less than 3        

>=(Greater Than Equal To)

x = 5
y = 3
print(x >= y)
# returns True because five is greater, or equal, to 3        

<=(Less Than Equal To)

x = 5
y = 3
print(x <= y)
# returns False because 5 is neither less than or equal to 3        

• Logical operators

and (Returns True if both statements are true)

x = 5
print(x > 3 and x < 10)
# returns True because 5 is greater than 3 AND 5 is less than 10        

or (Returns True if one of the statements is true)

x = 5
print(x > 3 or x < 4)
# returns True because one of the conditions are true (5 is greater than 3, but 5 is not less than 4)
        

not (Reverse the result, returns False if the result is true)

x = 5
print(not(x > 3 and x < 10))
# returns False because not is used to reverse the result        

• Special Operator

is ( it return true if both object are at the same memory location)

a = 5 
b = 5 
print(id(a))
print(id(b))
print(a is b)
# return true if id(a) and id(b) is same         

 in (Returns True if a sequence with the specified value is present in the object)

x = ["apple", "banana"]
print("banana" in x)
# returns True because a sequence with the value "banana" is in the list