Idiomatic Python: boolean expressions Brett Cannon April 18th, 2016 0 0 You might think that boolean expressions most frequently used as conditional guards which are the the bit of code that tests whether an if or while statement should execute are a fairly straight-forward concept and that there isn't really anything subtle to them at all. We can then optionally use else and a colon followed by one or more indented lines, and that code will be executed if the Boolean expression evaluates to false. Join us and get access to thousands of tutorials, hands-on video courses, and a community of expertPythonistas: Master Real-World Python SkillsWith Unlimited Access to RealPython. If you place not before this expression, then you get the inverse result, True. The idea behind this example is to show that sometimes using negative logic is the right way to go. The Python condition operators (i.e., = =) always evaluate to either 0 or 1. Study Resources. You can combine Boolean expressions to express my sundae preference when Rum Raisin is involved like so: NOT (Flavor_1 = Rum Raisin OR Flavor_2 = Rum Raisin). Let us first talk about declaring a boolean value and checking its data type. You can use the not operator in an if statement to check if a given condition is not met. TRUE and FALSE: There can only be two It's a string whose contents just so happened to be a Boolean expression true, but to Python, this is just a sequence of characters starting with capital T and then R-U-E. The Python Boolean type is one of Python's built-in data types. And if youre not sure which course to try next, take a look at our developer career paths. For example, the operator == tests if two values are equal. In this article, well cover what Boolean logic is, how it works, and how to build your own Boolean expressions. Boolean logic looks at a reported relationship between things and determines whether the relationship holds. For example, in my sundae, I want the first flavor to be chocolate and the second flavor to be vanilla. Code Foundations Courses & Tutorials | Codecademy, Interested in learning how to code, but unsure where to start? These words are keywords of the language, so you cant use them as identifiers without causing a syntax error. The third print, print (3, a == 6 and b == 7), is a little different. To get the most out of this tutorial, you should have some previous knowledge about Boolean logic, conditional statements, and while loops. Python logical operators are And, Or, and Not. Python Can',python,if-statement,boolean,boolean-expression,Python,If Statement,Boolean,Boolean Expression,[0][0]12 try: with . Bitwise Expressions: These are the kind of expressions in which computations are performed at bit level. The boolean is one of the data types provided by the Python programming language. In Python, False maps to 0 (zero) and True maps to 1 (one). equal and False otherwise: True and False are special values that belong Another reason to do it is simply to avoid editor warnings. Almost there! A good rule of thumb would be to avoid negative logic as much as possible without trying to avoid it at all costs. This functionality makes it worthwhile in several situations: In this tutorial, youll find examples that cover all these use cases. This detail makes the expression difficult to read and understand. Heres how we could build and test a basic potato sorter. Internally, Python implements them as integer numbers: Python internally implements its Boolean values as 1 for True and 0 for False. VB We know that a number thats evenly divisible by two is even that is to say, the remainder of the division will be zero. operations. A Boolean expression is an expression that evaluates to a value of the Boolean Data Type: True or False. This means that both the first flavor must be chocolate and the second flavor must be vanilla. Booleans are used to represent truth values, and they derive from mathematics and arithmetic. He worked out precise rules for expressions that are either entirely true or completely false. Instead of using arithmetic operators like addition, subtraction, and multiplication, Boolean logic utilizes three basic logical operators: AND, OR, and NOT. Heres a possible implementation: You use an infinite while loop to take the users input until they guess the secret number. Watch Now This tutorial has a related video course created by the Real Python team. You can evaluate any expression in Python, and get one of two answers, True or False. Now that we have some basic Boolean tools to work with, were ready to return to our odd vs. even example and start doing some branching logic. Finally, youll learn about some handy techniques that can help you avoid unnecessary negative logic, which is a programming best practice. For example, Python evaluates math and comparison operators first. An expression is a combination of operators and operands that is interpreted to produce some other value. So that if there is more than one operator in an expression, their precedence decides which operation will be performed first. Since the result of any expression evaluation can be returned by a function (using the return statement), functions can return boolean values. In Python, the boolean is a data type that has only two values and these are 1. You can determine an objects identity using id(). First condition is evaluated, then exactly one of either a or b is evaluated and returned based on the Boolean value of condition.If condition evaluates to True, then a is evaluated and returned but b is ignored, or else when b is evaluated and returned but . Here are some arithmetic operators in Python: Lets see an exemplar code of arithmetic expressions in Python : 3. Well help you focus on the best skills you need to succeed in your desired role. Booleans allow to create logical conditions that define the behaviour of an application. operators; the others are: Although these operations are probably familiar to you, the Python Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Among logical operators, not has higher precedence than the and operator and the or operator, which have the same precedence. Otherwise, I wont eat the sundae. Python boolean values are True and False. Is that right? Please help me understand the logic in them and how they are bringing out the different results. Boolean values are the two constant objects False and True. The Boolean AND operator is used to confirm that two or more Boolean expressions are all true. In Python, you have two statements that define Boolean contexts: These two structures are part of what youd call control flow statements. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. In general, negative logic implies a higher cognitive load than positive logic. The answer to this question is the not operator. Its possible and acceptable to set a variable to one of these values, but whats even more common than Boolean variables are Boolean expressions, which are any expression that returns a True or False value. Boolean Expression is the expression that returns true or false. Boolean logic is a key concept in any programming language, whether youre creating a video game with C++, developing the next best app in Swift, searching through relational databases in SQL, or working with big data in Python. The code below has the Python code with Boolean expressions. In that case, you can use not to check if the file doesnt exist: The not operator allows you to invert the result of calling .exists() on file. This content will prepare you to chart a course to a more technical c, What Boolean Logic Is & How Its Used In Programming, The Fastest Way To Learn Data Analysis Even If Youre Not A Numbers Person, 5 C++ Books For Beginners To Help You On Your Coding Journey, Why Your Recommender Algorithms Can Feel Eerily Spot-On. For example: >>>. The first syntax is somewhat difficult to read and non-Pythonic. Another way to describe Boolean expressions in Python (or other languages) is to say that they are expressions that make a comparison. Let's see how to use booleans in your Python programs! They are the central data type of PyEDA's symbolic Boolean algebra engine. The bool () method is used to return the truth value of an ex [resison. x = re.search ("^The. Python boolean type is one of the built-in data types provided by Python, which represents one of the two values i.e. Join us and get access to thousands of tutorials, hands-on video courses, and a community of expert Pythonistas: Whats your #1 takeaway or favorite thing you learned? Keep in mind that Boolean logic only works when an expression can be TRUE or FALSE. Python calls the points obtained as pt1 and pt2. Michael Klein is a freelancer with a love for statistics, data visualization, and his cat. The logical python boolean operators are responsible for connecting Boolean expressions. Logical Expressions: These are kinds of expressions that result in either True or False. Learn how your comment data is processed. Otherwise, it returns False. In the following operation, changing the precedence changes the result: This works out to True because and is evaluated first, like this: (False and False) or TrueIf we evaluate it the other way, False and (True or False), the result would be False. You can do it by yourself, or you can expand the box below to check out a possible implementation. Boolean expressions can be used with relational operators to show the . Instead of using arithmetic operators like addition, subtraction, and multiplication, Boolean logic utilizes three basic logical operators: AND, OR, and NOT. A Boolean is a data type that can have either a True or False value. Its an especially determined attempt to remove negative logic. Note: Python evaluates operators according to a strict order, commonly known as operator precedence. Another optional clause that can be useful in cases where there are more than two possibilities is an elif clause, which combines else and if. 1. When hes not writing for Codecademy, he enjoys geostatistics with R and playing with agent-based models. Now think of how to turn this negative conditional into a positive one. Much like operators in arithmetic, Boolean operators have an order of precedence: elements within a parentheses are addressed first, then the NOT operator, AND, and lastly OR. There may be more than one. The Python documentation lists the precedence rules for the entire language, but here our focus is on Boolean expressions and the related issue of comparison operators. They are used to represent truth values (other values can also be considered false or true). The purpose of custom_abs() is to facilitate the topic presentation. The keyword not is like a polarity reverser it makes a true expression false and a false expression true. They are case sensitive. Put another way, it changes TRUE values to FALSE and FALSE values to TRUE. For example, (10 == 9) is a condition if 10 is equal to 9. Since the name is a requirement for the rest of the game to work, you need to make sure you get it. To perform this kind of test in Python, you can use the in operator: The in operator returns True if the left-side object is in the container on the right side of the expression. Program Python dapat melakukan tindakan yang berbeda tergantung pada kondisi boolean (True atau False). No spam ever. Operator Precedence simply defines the priority of operators that which operator is to be executed first. The and operator and the or operator return one of the operands in an expression, while the not operator always returns a Boolean value: With the and operator and the or operator, you get True or False back from the expression when one of these values explicitly results from evaluating the operands. So, whenever possible, you should use positive formulations. With the double quotes surrounding it, False is interpreted as a string, not a Boolean value. Therefore, if each of these sides is a function that returns a Boolean result, if the first returns False, the second one will never be executed! A simple Boolean expression is written as Operand1 Comparison Operator Operand2 where Operand1 and Operand2 can be values, variables or mathematical expressions Comparison Operator can be one of those shown in the next table PHP Java C++ C# So, you should consider your specific problem and select the appropriate solution. Ketika suatu kondisi bernilai True, maka Python akan menjalankan kode program yang telah ditetapkan. Below we have examples which use numbers streams and Boolean values as parameters to the bool function. Go ahead and give it a try! Syntax: variable = True variable = False Boolean True vs 1, boolean False vs 0 Here are some logical operators in Python: 7. Boolean means True or False. When we work with multiple boolean expressions or perform some action on them, we make use of the boolean operators. Example Syntax: bool( [x]) Returns True if X evaluates to true else false. 10.2. to the class bool; they are not strings: The == operator is one of the comparison Its a quite simple process to get the result of an expression if there is only one operator in an expression. In this case, youre generating numbers from 1 to 10, both included. Example 2: Python If Statement where Boolean Expression is False. That is to say, well take this action if either thing is true they dont have to both be true. The following examples use the operator == , which compares two operands and produces True if they are equal and False otherwise: Save & Run Original - 1 of 1 Show CodeLens Pair? Python Operators: The Building Blocks of Successful Code, Python Format Strings: Beginner to Expert. When you're programming, you use Booleans to evaluate expressions and return an outcome that is either True or False. Different Boolean Operators in Python. A boolean expression is an expression that is either true or false. A Boolean expression is an expression that evaluates to produce a result which is a Boolean value. For this reason, this OR operator is also known as an inclusive OR operator. Example 5: Python If with multiple statements in the block. Expressions are chained using operators with higher precedence, using component parts that have operators with lower precedence. 3 + 4 evaluates to 7, which is a number, not a Boolean value. Example 4: Python If with Expression evaluating to a Number. I have found that the best way to understand the precedence rules in a language is not by memorizing lists of them, but by hands-on practice. The operand can be a Boolean expression or any Python object. Its more straightforward and understandable. It is used to analyze and simplify digital circuits or digital gates. Heres how to get started. Pythons not is a logical operator that inverts the truth value of Boolean expressions and objects. Boolean expressions are expressions in a programming language that produce a Boolean value. If not, then its FALSE. How would you correct them? It would start by evaluating 20 <= x, which is true. Lets discuss all types along with some exemplar codes : 1. You can use two different approaches: In this example, you remove the not operator by changing the comparison operator from equal (==) to different (!=). You can find the relevant documentation here. The boolean type . To better understand how Boolean operators work, lets suppose for a moment that were in an ice cream shop. Get the latest Python articles, hands-on exercises, and more from CodeSolid and around the web. How can you do that? With the help of Boolean operators, it is possible to combine the effects of two or more conditions into a single conclusion. The not keyword can also be used to inverse a boolean type. We can build Boolean expressions with all kinds of data, including variables. Curated by the Real Python team. Some students find it helpful to construct a truth table when learning about Boolean values. Boolean Constants and Expressions in Python, Handling More Than Two Cases in Python: Elif. A boolean expression is an expression that is either true or false. This means that x and y are not the same object. The evaluation of an and expression ends as soon as a value is falsy, the evaluation of an or expression ends as soon as a value is truthy. Operators are used to performing operations on values and variables. Python | Set 4 (Dictionary, Keywords in Python), Increment and Decrement Operators in Python. The Python documentation refers to this syntax as the is not operator and promotes its use as a best practice. Boolean expressions can take several forms. Manage SettingsContinue with Recommended Cookies. Say you want to code a small Python game to guess a random number between 1 and 10. Its incorrect. 3.1: Boolean Expressions. Expert Help. This number represents the objects identity. With not before the expression, you check if x is outside the 20 to 40 interval. All other values are interpreted as true. It also works in non-Boolean contexts, which allows you to invert the truth value of your variables. Example 6: Nested If. Otherwise, you get one of the operands in the expression. It takes an object as an argument and returns the same outcome as an equivalent not obj expression: To use not_(), you first need to import it from operator. This example uses double negation. Arguably, the most common use case of the not operator in a non-Boolean context is to invert the truth value of a given variable. Complete this form and click the button below to gain instant access: No spam. Otherwise, it returns False. The following examples use the operator ==, which compares two operands and produces True if they are equal and False otherwise: True and False are special values that belong to the class bool; they are not strings: The == operator is one of the . For example, lets suppose that weve assigned these values to variables x and y somewhere in our code: Now, we can build Boolean expressions using our variables: Boolean expressions can also determine whether two strings are identical. Your custom_abs() now uses positive logic. There are many cases while dealing with boolean operators or boolean sets/arrays in Python, where there is a need to negate the boolean value and get the opposite of the boolean value. We can use Boolean expressions and Boolean operators to figure out whether Ill eat a sundae or not. In the string case, by the way, the comparison is case-sensitive. Instructions. Python Boolean. The second example is much clearer. The operators take one or more boolean arguments, operate on them, and give the result. Try again. == is a comparison operator. There is no such thing as The not operator is the Boolean or logical operator that implements negation in Python. This means that x and y have the same value, but it does not mean they are the same object. A program branches when it goes down one path or another based on a condition. We can run code conditionally with just an if clause. Boolean logic is critical to creating code that helps your program quickly make decisions about data and inputs, so try putting your Boolean knowledge to use with an online programming course. either True or False. Source: www.tutorialbrain.com This function converts the other data types into boolean type. This turns out to be a very convenient way to hide the details of complicated tests. For example, one of the most common use cases of the is operator is to test if a given object is None: The is operator returns True when the left operand has the same identity as the right operand. 7 == 7 then evaluates to True, which is a Boolean value. OR boolean operator in Python What are the Boolean Expression and Boolean Operators? Example 1: Python If. Yes it is, so the Boolean result of this would be TRUE. It also defines a set of Boolean operations: AND, OR, and NOT. The second Boolean context in which you can use the not operator is in your while loops. In Python, the two Boolean values are True and False (the capitalization must be exactly as shown), and the Python type is bool. In any programming language, an expression is evaluated as per the precedence of its operators. Then it evaluates logical operators, including not: In the first example, Python evaluates the expression True == False and then negates the result by evaluating not. But if there is more than one operator in an expression, it may give different results on basis of the order of operators executed. When using and operator in boolean expressions, you can also use non-zero numbers instead of True and 0 instead of False. The word Boolean is capitalized out of deference to Charles Boole, a 19th-century mathematician and philosopher who wanted to apply mathematical principles to logic. On the other hand, not behaves differently, returning True or False regardless of the operand it takes. For example, 1==1 is True whereas 2<1 is False. Python List comparison of boolean expression on a range of list compressive elements for True/False . Finally, you should pay special attention to avoiding double negation. Does Python have a ternary conditional operator? If condition evaluates to true, then not returns False and the if code block doesnt execute. This code is cleaner, less repetitive, and less error-prone than the example you wrote before. Here is the precedence order, from highest to lowest: Because comparison operators are evaluated first, for example, were able to evaluate expressions like this: Because comparison operators have the highest precedence, Python first evaluates 3 > 5 to False and 9 > 2 to True. Thats why you get the correct result in the example above. #code 1 for row in range(7):#Code to p. What is the error in the following code? However, it can also be any expression or function call that returns a boolean result, such as "'error' in msg. What Are the Precedence Rules For Python Boolean Expressions? A Boolean expression is an expression that results in a Boolean value, that is, either true or false. Constant Expressions: These are the expressions that have constant values only. We could organize this situation into a table of possibilities like this: Tables like this are used in Boolean logic all the time. In Python, this kind of expression returns True or False. If youre working with integer numbers only, then the not in operator provides a more readable way to perform this check: The first example checks if x is inside the 20 to 40 range or interval. These are referred to as Boolean values in Python. Boolean operators are used to create more complex logical conditions. The boolean data type is a built-in data type used to define true and false values of the expressions with the keywords True and False. If the quotes had not been included, False alone is in fact a Boolean value. The while loop on line 10 iterates until the user provides a valid name. In this tutorial, you'll learn how to: Unlike the and operator and the or operator, the not operator has an equivalent function-based implementation in operator. The Python documentation refers to the syntax in the second example as the not in operator. Determine if the following statements are boolean expressions or not. The next step would be to compare that true result with 40, which doesnt make much sense, so the expression fails. The second syntax reads like plain English: The first example works. The result of this type of expression is also a numeric value. Syntax of Python If. Say were going to put together a two-scoop sundae with different flavors. Do your best to try these exercises without running them in Python. Boolean Operators are the operators that operate on the Boolean values, and if it is applied on a non-Boolean value, then the value is first typecasted and then operated upon. And the truth table would look like this: Note that the OR operator returns TRUE if one of the two Boolean expressions is true, but also when both expressions are true. What this means is that for and, if the first expression (on the left side of "and) is false, the right-hand side is never evaluated. It produces (or yields) a Boolean value: The == operator is one of six common comparison operators which all produce a bool result. As always, its easiest to show with an example. Boolean algebra is the category of algebra in which the variable's values are the truth values, true and false, ordinarily denoted 1 and 0 respectively. This chapter will explain how to construct and manipulate Boolean expressions. The values of the points can be expressed in the coordinate of x and y of pt1, pt2. To sort out these confusions, the operator precedence is defined. Of course not, and thats why this Boolean expression would return a value of FALSE. The task of not is to reverse the truth value of its operand. An expression is a combination of operators and operands that is interpreted to produce some other value. The lines: print(1, a == 6) print(2, a == 7) print out a True and a False respectively just as expected since the first is true and the second is false. Introduction. None is a special type that represents the absence of a value. For example, using ==, we can check that two lists contain the same elements or that two strings are identical. However before writing the code for it, we need to take a fun side trip to the hardware store to pick up some other tools for the job. One common type of Boolean expression is the family of comparison (or relational) expressions, which check the truth/falsehood of equalities and inequalities (greater than >, less than or equals <=, etc.). In Python, the Boolean type, bool, is a subclass of int: This type has two possible values, True and False, which are built-in constants in Python and must be capitalized. What are Boolean? To do a case insensitive comparison, we can convert both strings to the same case and then make the comparison: As consistent as Python is in general, there is one case in which == and != are not recommended, and thats the case of checking for None. For example, you could use a Boolean expression to determine whether a number is contained within a list in Python or whether a text string is within a SQL database table. If the object evaluates to True, then not returns False. For example: Note that the double equals of a Boolean expression (==) are different from the single equals sign that we used to assign a value to a variable: Frequently, Boolean expressions are expressions that use comparison operators. It is in this context that we have the equality operator, which is written as == and returns a bool. In other words, you can use it outside of an if statement or a while loop. We have many different types of expressions in Python. There are three basic Boolean operators, AND, OR, and NOT. 1. 9.1. Weve seen a lot of this already in our example, but here are the Python comparison operators and what they mean.OperatorHow to Read Itx == yx equals yx != yx does not equal y, x is not equal to yx >= yx is greater than or equal to yx <= yx is less than or equal to yAdvertisementsif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'codesolid_com-large-leaderboard-2','ezslot_7',550,'0','0'])};__ez_fad_position('div-gpt-ad-codesolid_com-large-leaderboard-2-0'); Just like in English, we can negate any boolean expression by using the keyword not in front of it. Thats why you need the not operator to invert the result of .exists(). However, if you already have a working expression that successfully checks if a number is in a given interval, then you can reuse that expression to check the opposite condition: In this example, you reuse the expression you originally coded to determine if a number is inside a target interval. As we know it is not correct, so it will return False. Note: The example above uses pathlib from the standard library to handle file paths. In that case, you can use a flag variable to toggle actions in every iteration: Every time this loop runs, you check the truth value of toggle to decide which course of action to take. Save my name, email, and website in this browser for the next time I comment. Notice how each expression ends up being either False or True. Because were using and and not or, the compound expression evaluates to false, so the else clause is executed. The Boolean NOT operator is different from AND and OR as it only takes one argument. A boolean can have two values: True or False. Q-4: Which of the following comparison operators is used to check if x and y are the same object? You can always use the unsubscribe link included in the newsletter. Since the not operator returns the negated result, something true becomes False and the other way around. Free Bonus: 5 Thoughts On Python Mastery, a free course for Python developers that shows you the roadmap and the mindset youll need to take your Python skills to the next level. Since one of the expressions is true, changing the and to or in the example above changes the output to Go out with friends. On the other hand, if both expressions are false, then the else clause will run either way. Using negative logic correctly can be tricky because this logic is difficult to think about and understand, not to mention hard to explain. Understanding how Python Boolean values behave is important to programming well in Python. A boolean expression is an expression that yields just the two outcomes: true or false. In Python, there are two Boolean constants that are capitalized: True and False. You can also use this function in a negative conditional statement to approach those situations where you want to work with composite numbers only: Since its also possible that you need to work with composite numbers only, you can reuse is_prime() by combining it with the not operator as you did in this second example. We discuss some common ways to loop in detail in our article Python Lists for Beginners. Suppose you need a conditional statement to initialize a given file when it doesnt exist in the file system. We could turn this into a Boolean expression with an AND operator that looks something like this: Flavor_1 = Chocolate AND Flavor_2 = Vanilla. When youre working with integer numbers, this small trick about where exactly you use the not operator can make a big difference regarding code readability. Going without precedence it could have given two different outputs 22 or 52. To make an if statement test if something didnt happen, you can put the not operator in front of the condition at hand. This reassigns the value of y to x. However, Python is actually very flexible about what can be a Boolean expression. Using the not_() function instead of the not operator is handy when youre working with higher-order functions, such as map(), filter(), and the like. Pythons not operator allows you to invert the truth value of Boolean expressions and objects. These might also be regarded as the logical operators, and the final result of the Boolean operation is a Boolean value, True or False. To determine if a number x is in a given interval in Python, you can use the and operator or you can chain comparison operators appropriately: In the first example, you use the and operator to create a compound Boolean expression that checks if x is between 20 and 40. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); This site uses Akismet to reduce spam. Because Python was designed with simplicity in mind, the English words in bold in the last paragraph are also Python keywords we can use to create compound Boolean expressions. On the other hand, or returns true if at least one of the expressions that it joins is true.For example, heres a program where one of the expressions (time_available_minutes > 120) is true. We and our partners use cookies to Store and/or access information on a device.We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.An example of data being processed may be a unique identifier stored in a cookie. As an exercise, you can restrict the number of attempts before the user loses the game. In the first statement, the two operands evaluate to equal values, so the expression evaluates to True; in the second statement, 5 is not equal to 6, so we get False. Leodanis is an industrial engineer who loves Python and software development. Select all that apply. Boolean Expressions Python EDA Documentation Boolean Expressions Expressions are a very powerful and flexible way to represent Boolean functions. In this example, the combination of the two parts 2 + 2 and 4, together with the relationship (= equals), is called a Boolean expression. Those arithmetic expressions are evaluated first, and then compared as per relational operator and produce a boolean output in the end. Our Code Foundations domain provides an overview of the main applications of programming and teaches important concepts that youll find in every programming language. However, they reflect their corresponding bitwise operators rather than the Boolean ones. In programming, this kind of feature is known as negative logic or negation. For example, the expression 3 + 8 isnt a Boolean expression because its not being compared or related to something else. If the user provides no name by just pressing Enter, then input() returns an empty string ("") and the loop runs again because not "" returns True. To kick things off, youll start by learning how the not operator works with Boolean expressions and also with common Python objects. Write a python program that sets a variable called isValid to a Boolean value. (cond_boolean_equal) To behave like the and operator and the or operator, the not operator would have to create and return new objects, which is often ambiguous and not always straightforward. In that case, you can write an is_prime() function: In this example, is_prime() takes an integer number as an argument and returns True if the number is prime. The following code works OK, but what if anything is wrong with it? Write a Boolean expression that tests if the value stored in the variable num1 is equal to the value stored in the variable num2. In addition, operators can manipulate individual items and returns a result. In numeric contexts (for example, when used as the argument to an arithmetic operator), they behave like the integers 0 and 1, respectively. Now that you understand the basics of Boolean expressions, lets look at another key aspect of Boolean logic: Boolean operators. 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