Tuesday, June 12, 2018

Operators in Python




To perform any operations on variables and value we can use Operaters,

There are some operators in python language are as following:

Arithmetic Operators

Comparison (Relational) Operators.

Assignment Operators

Logical Operators

Bit wise Operators

Membership Operators

Identity Operators

Let see one by one



Arithmetic Operators


Operator
Description
Example
+ (Addition) Adds values on either side of the operator. ->x + y
10 + 20 = 30
- (Subtraction) Subtracts right hand operand from left hand operand ->x – y
10 – 20 = 10
* (Multiplication) Multiplies values on either side of operator ->x * y
10 * 20 = 200
/ (Division) Divides left hand operand by right hand operand ->y/x
20/10 = 2
% (Modulus) Divides left hand operand by right hand operand and returns remainder ->y % x
20 % 10 = 0
** (Exponent) Performs exponential (power) calculation on operators ->x **y
10 ** 2 = 100
// Floor Division of operands where the result is the quotient in which the digits after the decimal point are removed ->x//y
20//10 = 2
and
20.0//10.0 = 2.0


Comparison Operators


Operator
Desicription
Example
== If the values of two operands are equal, then the condition becomes true. (a == b) is not true.
!= If the values of two operands are equal, then the condition
becomes true.
(a!= b) is true.
> If the value of left operand is greater than the value of right
operand, then condition becomes true.
(a > b) is not true.
< If the value of left operand is less than the value of right
operand, then condition becomes true.
(a < b) is true.
>= If the value of left operand is greater than or equal to the
value of right operand, then condition becomes true.
(a >= b) is not true.
<= If the value of left operand is less than or equal to the value
of right operand, then condition becomes true.
(a <= b) is true.


Assignment Operators:

Operator
Desicription
Example
= Assigns values from right side operands to left side operand c = a + b assigns value of a + b into c
+= Add AND It adds right operand to the left operand and assign the result to left operand c += a is equivalent to c = c + a
-= Subtract AND It subtracts right operand from the left operand and assign the result to left operand c -= a is equivalent to c = c - a
*= Multiply AND It multiplies right operand with the left operand and assign the result to left operand c *= a is equivalent to c = c * a
/= Divide AND It divides left operand with the right operand and assign the result to left operand c /= a is equivalent to c = c / ac /= a is equivalent to c = c / a
%= Modulus AND It takes modulus using two operands and assign the result to left operand c %= a is equivalent to c = c % a
**= Exponent AND Performs exponential (power) calculation on operators and assign value to the left operand C **= a is equivalent to c = c ** a
//= Floor Division It performs floor division on operators and assign value to the left operand c //= a is equivalent to c = c // a


Bit wise Operators:


Operator
Desicription
Example
& Binary AND Operator copies a bit to the result, if it exists in both operands (a & b) (means 0000 1100)
| Binary OR It copies a bit, if it exists in either operand. (a | b) = 61 (means 0011 1101)
^ Binary XOR It copies the bit, if it is set in one operand but not both. (a ^ b) = 49 (means 0011 0001)
~ Binary Ones Complement It is unary and has the effect of 'flipping' bits. (~a ) = -61 (means 1100 0011 in 2's complement form due to a signed binary number.
<< Binary Left Shift The left operand’s value is moved left by the number of bits specified by the right operand. a << = 240 (means 1111 0000)
>> Binary Right Shift The left operand’s value is moved right by the number of bits specified by the right operand. a >> = 15 (means 0000 1111)



Logical Operators:


Operator
Description
Example
and Logical AND If both the operands are true then condition becomes true. (a and b) is False.
or Logical OR If any of the two operands are non-zero then condition becomes true. (a or b) is True.
not Logical NOT Used to reverse the logical state of its operand. Not(a and b) is True.



Membership Operators:


Operator
Desicription
Example
in Evaluates to true, if it finds a variable in the specified sequence and false otherwise. x in y, here in results in a 1 if x is a member of sequence y.
not in Evaluates to true, if it does not find a variable in the specified sequence and false otherwise. x not in y, here not in results in a 1 if x is not a member of sequence y.



Identity Operators:


Operator
Desicription
Example
is Evaluates to true if the variables on either side of the operator point to the same object and false otherwise. x is y, here is results in 1 if id(x) equals id(y).
is not Evaluates to false if the variables on either side of the operator point to the same object and true otherwise. x is not y, here is not results in 1 if id(x) is not equal to id(y).



Operators Precedence:


The following table lists all the operators from highest precedence to the lowest.

Operator
Desicription
** Exponentiation (raise to the power)
~+ - complement, unary plus and minus (method names for
the last two are +@ and -@)
* / % // Multiply, divide, modulo and floor division
+ - Addition and subtraction
>> << Right and left bit wise shift
& Bitwise 'AND'
^| Bit wise exclusive `OR' and regular `OR'
<= < > >= Comparison operators
<> == != Equality operators
= %= /= //= -= += *= **= Assignment operators
is is not Identity operators
in not in Membership operators
not or and Logical operators



Prev: Input,Output and Import InPython

References: tutorial point, Wikipedia

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