![]() ![]() Returns True if the operands do not refer to the same object. Returns True if the operands refer to the same object. There are two identity operators in Python - is and is not. These are used to check if two operands (values) are located in the same memory. After this, the expression a -= 4 got evaluated as a = a - 4 thus subtracting 4 from the current value of a (i.e. The expression a += 4 got evaluated as a = a + 4 thus making the value of a as 11. In the above example, initially, the value of a is 7. Python has preset rules of which operation it is going to perform first which you will learn later in this chapter. The decision of evaluating n+2 first is not a random one. So the calculated value is assigned to n, changing the value of n (making n = 7). Thus the expression will become n = 5+2 or n=7. So, n+2 is calculated first and thus it will become 5+2 i.e., 7. Here, the value of n + 2 is calculated first (using the old value of n). We said that n+=2 is evaluated to n = n+2 but n = n+2 is evaluated? This is little different to what happens in normal mathematics. Now if we write n += 2, the expression gets evaluated as n = n + 2 thus making the value of n as 7 ( n = 5 + 2 ). To understand their use, consider the value of a variable n as 5. Takes modulus using two operands and assigns the result to left operandĬalculates left operand raised to the power right operand and assigns the result to the left operand Multiplies the value of right operand to left operand and assigns the final value to left operandĭivides the value of left operand by right operand and assigns the quotient to left operandĭivides the value of left operand by right operand and assigns the quotient (integer) to left operand Subtracts the value of right operand from left operand and assigns the final value to left operand OperatorĪssigns value of right operand to left operandĪdds the value of right operand to left operand and assigns the final value to the left operand There are more assignment operators which are listed in the following table. ![]() For example, 10 = a would give us an error because we are trying to assign the variable a (right side) to 10 (left side) and this is invalid as 10 is a constant and we can't change its value to something else, a in this case. ![]() We can’t use = to assign the value of the left side operand to the right side operand. So, if a condition is True, not makes it False and vice versa. If any one or both the operands are True, then the condition becomes True If both the operands are True, then the condition becomes True Or can be understood as either (either first or second or both).Īnd and or of programming are very much similar to English words 'and' and 'or'.Īgain assume the value of a to be True and that of b to be False. If we use or as an operator and if any of the two operands is True, then the result is True, and if both the operands are False then the result is False.Īnd can be understood as both (both first and second) So, if we use and as an operator with any two operands and if both of them are True, then the result is True. Look at the following table in which Exp1 and Exp2 are the two operands. = assigns a value " Sam" to the variable name and = checks whether the value of the variable name is " Sam" or not.
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