Python Basic Operators

What is an operator? Simple answer can be g iven using expression 4 + 5 is equal to 9. Here, 4 and 5 are called operands and + is called operator. Python lang uag e supports the following types of operators. Arithmetic Operators Comparison (i.e., Relational) Operators Assig nment Operators Log ical Operators Bitwise Operators Membership Operators Identity Operators Let's have a look on all operators one by one. Python Arithmetic Operators: Assume variable a holds 10 and variable b holds 20, then: [ Show Example ] O perator Desc ription Example + Addition - Adds values on either side of the operator a + b will g ive 30 - Subtraction - Subtracts rig ht hand operand from left hand operand a - b will g ive -10 * Multiplication - Multiplies values on either side of the operator a * b will g ive 200 / Division - Divides left hand operand by rig ht hand operand b / a will g ive 2 % Modulus - Divides left hand operand by rig ht hand operand and returns remainder b % a will g ive 0 ** Exponent - Performs exponential (power) calculation on operators a**b will g ive 10 to the power 20 // Floor Division - T he division of operands where the result is the quotient in which the dig its after the decimal point are removed. 9//2 is equal to 4 and 9.0//2.0 is equal to 4.0 Python Comparison Operators: Assume variable a holds 10 and variable b holds 20, then: [ Show Example ] O perator Desc ription Example == Checks if the value of two operands are equal or not, if yes then condition becomes true. (a == b) is not true. != Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. (a != b) is true. <> Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. (a <> b) is true. T his is similar to != operator. > Checks if the value of left operand is g reater than the value of rig ht operand, if yes then condition becomes true. (a > b) is not true. < Checks if the value of left operand is less than the value of rig ht operand, if yes then condition becomes true. (a < b) is true. >= Checks if the value of left operand is g reater than or equal to the value of rig ht operand, if yes then condition becomes true. (a >= b) is not true. <= Checks if the value of left operand is less than or equal to the value of rig ht operand, if yes then condition becomes true. (a <= b) is true. Python Assig nment Operators: Assume variable a holds 10 and variable b holds 20, then: [ Show Example ] O perator Desc ription Example = Simple assig nment operator, Assig ns values from rig ht side operands to left side operand c = a + b will assig ne value of a + b into c += Add AND assig nment operator, It adds rig ht operand to the left operand and assig n the result to left operand c += a is equivalent to c = c + a -= Subtract AND assig nment operator, It subtracts rig ht operand from the left operand and assig n the result to left operand c -= a is equivalent to c = c - a *= Multiply AND assig nment operator, It multiplies rig ht operand with the left operand and assig n the result to left operand c *= a is equivalent to c = c * a /= Divide AND assig nment operator, It divides left operand with the rig ht operand and assig n the result to left operand c /= a is equivalent to c = c / a %= Modulus AND assig nment operator, It takes modulus using two operands and assig n the result to left operand c %= a is equivalent to c = c % a **= Exponent AND assig nment operator, c **= a is equivalent to c = c ** a Performs exponential (power) calculation on operators and assig n value to the left operand //= Floor Dividion and assig ns a value, Performs floor division on operators and assig n value to the left operand c //= a is equivalent to c = c // a Python Bitwise Operators: Bitwise operator works on bits and perform bit by bit operation. Assume if a = 60; and b = 13; Now in binary format they will be as follows: a = 0011 1100 b = 0000 1101 ----------------a&b = 0000 1100 a|b = 0011 1101 a^b = 0011 0001 ~a = 1100 0011 T here are following Bitwise operators supported by Python lang uag e [ Show Example ] O perator Desc ription Example & Binary AND Operator copies a bit to the result if it exists in both operands. (a & b) will g ive 12 which is 0000 1100 | Binary OR Operator copies a bit if it exists in eather operand. (a | b) will g ive 61 which is 0011 1101 ^ Binary XOR Operator copies the bit if it is set in one operand but not both. (a ^ b) will g ive 49 which is 0011 0001 ~ Binary Ones Complement Operator is unary and has the efect of 'flipping ' bits. (~a ) will g ive -61 which is 1100 0011 in 2's complement form due to a sig ned binary number. << Binary Left Shift Operator. T he left operands value is moved left by the number of bits specified by the rig ht operand. a << 2 will g ive 240 which is 1111 0000 >> Binary Rig ht Shift Operator. T he left operands value is moved rig ht by the number of bits specified by the rig ht operand. a >> 2 will g ive 15 which is 0000 1111 Python Log ical Operators: T here are following log ical operators supported by Python lang uag e. Assume variable a holds 10 and variable b holds 20 then: [ Show Example ] O perator Desc ription Example and Called Log ical AND operator. If both the operands are true then then condition becomes true. (a and b) is true. or Called Log ical OR Operator. If any of the two operands are non zero then then condition becomes true. (a or b) is true. not Called Log ical NOT Operator. Use to reverses the log ical state of its operand. If a condition is true then Log ical NOT operator will make false. not(a and b) is false. Python Membership Operators: In addition to the operators discussed previously, Python has membership operators, which test for membership in a sequence, such as string s, lists, or tuples. T here are two membership operators explained below: [ Show Example ] O perator Desc ription 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 finds 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. Python Identity Operators: Identity operators compare the memory locations of two objects. T here are two Identity operators explained below: [ Show Example ] O perator Desc ription 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). Python Operators Precedence T he following table lists all operators from hig hest precedence to lowest. [ Show Example ] O perator ** Desc ription Exponentiation (raise to the power) ~+- Ccomplement, unary plus and minus (method names for the last two are +@ and @) * / % // Multiply, divide, modulo and floor division +- Addition and subtraction >> << Rig ht and left bitwise shift & Bitwise 'AND' ^| Bitwise exclusive `OR' and reg ular `OR' <= < > >= Comparison operators <> == != Equality operators = %= /= //= -= += *= **= Assig nment op

erators is is not Identity operators in not in Membership operators not or and Log ical operators