Python Operators
An operator is special symbol that can be used to perform a partular operation between the operands. An operator cannot be used without any operand. The logic of any program is built with the help of operators, so we can say that the operators are the pillars of a program. A variety of operators are used in python as follows:
Arithmetic operators
Arithmetic operators are used to perform arithmetic operations between two operands. It includes +(addition), - (subtraction), *(multiplication), /(divide), %(reminder), //(floor division), and exponent (**).
Consider the following table for a detailed explanation of arithmetic operators.
| Operator | Description |
|---|---|
| + | It is used to add two operands. For example, if a = 20, b = 10 => a+b = 30 |
| - | It is used to subtract two operands. For example, if a = 20, b = 10 => a-b = 10 |
| * | It is used to multiply two operands. For example, if a = 20, b = 10 => a*b = 200 |
| / | It is used to divide two operands. For example, if a = 20, b = 10 => a/b = 2 |
| % | It is used to provide remainder two operands. For example, if a = 20, b = 10 => a%b = 0 |
| // | It is used to perform floor division two operands.It gives the floor value of the quotient produced by dividing the two operands. |
Comparison operator
Comparison operators are used to comparing the value of the two operands and returns boolean true or false accordingly. The comparison operators are described in the following table.
| Operator | Description |
|---|---|
| == | If the value of two operands is equal, then the condition becomes true. |
| != | If the value of two operands is not equal then the condition becomes true. |
| <= | If the first operand is less than or equal to the second operand, then the condition becomes true. |
| >= | f the first operand is greater than or equal to the second operand, then the condition becomes true. |
| If the value of two operands is not equal, then the condition becomes true. | |
| > | If the first operand is greater than the second operand, then the condition becomes true. |
| Operator | Description |
|---|---|
| = | It assigns the the value of the right expression to the left operand. |
| += | It increases the value of the left operand by the value of the right operand and assign the modified value back to left operand. For example, if a = 10, b = 20 => a+ = b will be equal to a = a+ b and therefore, a = 30. |
| -= | It decreases the value of the left operand by the value of the right operand and assign the modified value back to left operand. For example, if a = 20, b = 10 => a- = b will be equal to a = a- b and therefore, a = 10. |
| *= | It multiplies the value of the left operand by the value of the right operand and assign the modified value back to left operand. For example, if a = 10, b = 20 => a* = b will be equal to a = a* b and therefore, a = 200. |
| %= | It divides the value of the left operand by the value of the right operand and assign the reminder back to left operand. For example, if a = 20, b = 10 => a % = b will be equal to a = a % b and therefore, a = 0. |
| **= | a**=b will be equal to a=a**b, for example, if a = 4, b =2, a**=b will assign 4**2 = 16 to a. |
| //= | A//=b will be equal to a = a// b, for example, if a = 4, b = 3, a//=b will assign 4//3 = 1 to a |
Bitwise operator
The bitwise operators perform bit by bit operation on the values of the two operands.
| Operator | Description |
|---|---|
| &(Binary and) | If both the bits at the same place in two operands are 1, then 1 is copied to the result. Otherwise, 0 is copied. |
| |(Binary or) | The resulting bit will be 0 if both the bits are zero otherwise the resulting bit will be 1. |
| ^(Binary xor) | The resulting bit will be 1 if both the bits are different otherwise the resulting bit will be 0. |
| ~(negation) | It calculates the negation of each bit of the operand, i.e., if the bit is 0, the resulting bit will be 1 and vice versa. |
| <<(left shift) | The left operand value is moved left by the number of bits present in the right operand. |
| >>(right shift) | The left operand is moved right by the number of bits present in the right operand. |
Logical Operators
The logical operators are used primarily in the expression evaluation to make a decision. Python supports the following logical operators.
| Operator | Description |
|---|---|
| and | If both the expression are true, then the condition will be true. If a and b are the two expressions, a ? true, b ? true => a and b ? true. |
| or | If one of the expressions is true, then the condition will be true. If a and b are the two expressions, a ? true, b ? false => a or b ? true. |
| not | If an expression a is true then not (a) will be false and vice versa. |
Membership Operators
Python membership operators are used to check the membership of value inside a data structure. If the value is present in the data structure, then the resulting value is true otherwise it returns false.
| Operator | Description |
|---|---|
| in | It is evaluated to be true if the first operand is found in the second operand (list, tuple, or dictionary). |
| not in | It is evaluated to be true if the first operand is not found in the second operand (list, tuple, or dictionary). |
Identity Operators
| Operator | Description |
|---|---|
| is | It is evaluated to be true if the reference present at both sides point to the same object. |
| is not | It is evaluated to be true if the reference present at both side do not point to the same object. |