PEP 572 - Assignment Expressions | peps.python.org The string representation of an object. Built-in Functions Python 3.11.4 documentation Commenting Tips: The most useful comments are those written with the goal of learning from or helping out other students. Unlike regular assignments, assignment expressions have a return value, which is why theyre called expressions in the first place. Toggle navigation of old-assignment-from-none / W1111. In this example, the assignment inserts a new item into your target list. How come you cant use list() to build a list from a call to map() that returns a generator of square numbers? assignment-from-none / E1128; . The first one assigns the string "Hello, World!" If you call dir(), then youll realize that np and pd are now in your namespace. Read on to see the assignment statements in action! Remember that to create a tuple, you just need a series of comma-separated elements. The eval () function parses the python expressions and runs the code passed to it as a parameter within the python program. The _ variable is a placeholder that guarantees that the unpacking works correctly. In Python, the eval () function is used to evaluate a string as a Python expression. 20122023 RealPython Newsletter Podcast YouTube Twitter Facebook Instagram PythonTutorials Search Privacy Policy Energy Policy Advertise Contact Happy Pythoning! docs.python.org/2/library/functions.html#locals. For a deep dive into this special type of assignment, check out The Walrus Operator: Python 3.8 Assignment Expressions. Almost, but I need to dynamically assign the variable name. In Python, youll find a few situations in which using assignments is either forbidden or dangerous. Problematic code: eval ("[1, 2, 3]") # [eval-used . Go ahead and run the following code to try out the new implementation of Point: Great! The Eval Function in Python: A Powerful but Dangerous Weapon In Python, a variable is a name that refers to a concrete value or object, allowing you to reuse that value or object throughout your code. It can lead to subtle bugs that can be difficult to track down. In this example, its a placeholder for a generic operator. Consider the following examples and pay attention to the result of calling the id() function: Mutable sequences like lists support the += augmented assignment operator through the .__iadd__() method, which performs an in-place addition. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned, syntax error trying to eval code block containing assignment. ast Abstract Syntax Trees Python 3.11.4 documentation Assignment Operators in Python - GeeksforGeeks Python: How can I save the output of eval() in a variable? The Python 3.8 documentation also includes some good examples of assignment expressions. This addition is possible because dictionaries dont have consecutive indices but unique keys, which are safe to add by assignment. Python also offers augmented assignment operators for most math operators. Therefore, try to find an alternative name or use a synonym whenever you find yourself using this convention. Example. Not the answer you're looking for? The next example consists of a regular assignment statement. As its name implies, the function is used to evaluate a Python expression. So, you should be aware of them and know how they work in practice. * If the expression is empty. This assignment isnt allowed because theres no way to guarantee that new indices will be consecutive. You can determine this interval using a small script like the following: This script helps you determine the interning interval by comparing integer numbers from -10 to 500. The assignment is done by position. Its also useful when you want to make your imported names non-public using a leading underscore, like in import sys as _sys. This new statement is known as an assignment expression or named expression. In contrast, if you use a number that falls outside of the interning interval, then your variables will point to different objects instead. When you define a class with the class keyword, youre assigning a specific name to a class object. Note: Computing the sum of a series of numeric values is a common operation in programming. Unpacking an iterable means assigning its values to a series of variables one by one. You can actually put exec() command inside eval(), So your statement would look like eval("exec('x = 1')"). Does this change how I list it on my CV? - Frank Yellin Oct 5, 2020 at 17:29 1 exec does what you want. Python Operators: Arithmetic, Logical, Comparison, Assignment, Bitwise You can't, since variable assignment is a statement, not an expression, and eval can only eval expressions. The @ character here marks a variable name rather than a column name, and lets you efficiently evaluate expressions involving the two "namespaces": the namespace of columns, and the namespace of Python objects.Notice that this @ character is only supported by the DataFrame.eval() method, not by the pandas.eval() function, because the pandas.eval() function only has access to the one (Python . Check out Pythons Counter: The Pythonic Way to Count Objects for a complete guide on how to use this tool. Connect and share knowledge within a single location that is structured and easy to search. In contrast, with immutable sequences, the data can only come as objects of the same type. Get tips for asking good questions and get answers to common questions in our support portal. The general syntax of an assignment statement is as follows: This expression looks like a regular assignment. The decorator syntax is syntactic sugar for replacing the previous assignment, which you can now write as follows: Even though this new code looks pretty different from the above assignment, the code implicitly runs the same steps. Python Assignment Operators Example - Online Tutorials Library For a concrete example of when youd need to swap values between variables, say youre learning how to implement the bubble sort algorithm, and you come up with the following function: In the highlighted line, you use a parallel assignment to swap values in place if the current value is less than the next value in the input list. Python assignment operators are used for assigning the value of the right operand to the left operand. The parameter will hold a reference to the input arguments. If you provide a name, then the function uses it instead of the default one. This additional behavior is another important detail to consider in this kind of statement. For example, the expression a == 42 is equivalent to 42 == a. pyspark.pandas.DataFrame.eval PySpark 3.4.1 documentation Now check what happens when you use a greater initial value: Now n and m hold different memory addresses, which means they point to different instances of the integer number 300. Consider using `ast.literal_eval` for safely evaluating strings containing Python expressions from untrusted sources. If you run the script from your command line, then youll get an output like the following: This output means that if you use a single number between -5 and 256 to initialize several variables in independent statements, then all these variables will point to the same object, which will help you save small bits of memory in your code. Note: Like C, Python uses == for equality comparisons and = for assignments. 6. Expressions Python 3.11.4 documentation Python automatically stores this value in the _ variable. Can Gayatri Mantra be used as background song in movies? For the expression to work correctly, the enclosing parentheses are required in most use cases. How can I assign the value of a variable using eval in python? . Thats the interning interval for integer numbers. A simple statement is comprised within a single logical line. The assignment operator unpacks these values into the four variables on the left side of the statement. Method 1: Simple Assignment The most straightforward way to store the result of an eval () expression in a Python variable is to as s ign the whole return value to the variable. Then you call len() to get the number of values in the list. The syntax to write these types of assignment statements is the following: In the first construct, expression can return any Python object, including another list. You can concatenate tuples to tuples and strings to strings, for example. inplace bool, default False. string. You can use this statement for two main purposes: When you use a variable name as the left operand in an assignment statement for the first time, youre creating a new variable. Learn more about Teams Keywords are an intrinsic part of the language and cant be overridden. Sometimes, you need to name variables, but the desired or ideal name is already taken and used as a built-in name. In this specific example, when Python tries to compute x + 1, it finds that x isnt defined. The right-hand operand in an assignment statement can be any Python object, such as a number, list, string, dictionary, or even a user-defined object. Theyre a fundamental part of the language, providing an explicit way to create, initialize, and mutate variables. Even though running multiple assignments on the same variable during a programs execution is common practice, you should use this feature with caution. If you ever need to initialize a list with a bunch of empty sublists, then use a list comprehension: This time, when you populate the first sublist of matrix, your changes arent propagated to the other sublists. To clarify this ambiguity, you can provide the appropriate type hint for users: Now youre clearly communicating that users will hold a list of User instances. I tried eval('x = 1') but that won't work. pandas.eval pandas 2.0.3 documentation You can evaluate any expression in Python, and get one of two answers, True or False. This is used to. Why did CJ Roberts apply the Fourteenth Amendment to Harvard, a private school? It takes a string as an argument and returns the result of evaluating the expression. Python's eval () allows you to evaluate arbitrary Python expressions from a string-based or compiled-code-based input. For example, say that you need to define a counter variable to count some stuff in your code. The 2.x code was used because it's a convenient way to, e.g. Free Source Code: Click here to download the free assignment operator source code that youll use to write assignment statements that allow you to create, initialize, and update variables in your code. Immutable sequences, such as tuples and strings, dont provide an .__iadd__() method. In Python, assigning a new value to an existing variable doesnt modify the variables current value. The print() statement at the end prints the value of x, which is 20. The as keyword assigns the raised exception to error. Note: Even though adding an underscore at the end of a name is an officially recommended practice, it can be confusing sometimes. Developers use AI tools, they just dont trust them (Ep. Compound statements are those that require an indented block, such as for and while loops, conditionals, with statements, try except blocks, and class or function definitions. You wont use the values that end up in this disposable variable. Youll learn about augmented assignments. Heres an example: From this point on, the name greet refers to a function object that lives at a given memory address in your computer. If you dont provide a name during the call to greet(), then the function uses the default value provided in the definition. The expression string to evaluate. To actually define it, you need to use an assignment. Connect and share knowledge within a single location that is structured and easy to search. Therefore, they should point to different instances of the number 42. They store memory addresses rather than objects. Thanks to the Coordinate descriptor, you now have a more concise and non-repetitive version of your original code. Through an import statement, you assign a name to a module object, class, function, or any other imported object. They provide a shorthand notation for a specific and popular kind of assignment. You can avoid this extra step by combining it with the first use of the target value, len(sample), using an assignment expression like the following: The assignment expression introduced in the conditional computes the sample size and assigns it to n. This way, you guarantee that you have a reference to the sample size to use in further computations. Note: In the example above, if your target iterable is a sequence data type, such as a list or tuple, then its best to access its last item directly. Those use cases include variable creation and initialization, parallel assignments, iterable unpacking, augmented assignments, and more. In contrast, the statement a = 42 is correct and legal, while 42 = a isnt allowed. Note that since _ is a regular variable, you can use it in other expressions: In this example, you first create a list of values. In the following sections, youll learn when using assignment statements isnt allowed in Python. Therefore, you cant use a regular assignment to assign a value to a variable within the context of an expression. Finally, note that accessing a variable in an interactive session returns the value stored in the target variable. Related Tutorial Categories: python - Syntax error when using an assignment (of a lambda) in eval Youll also learn about some situations in which using assignments should be avoided if you want to keep your code consistent and robust. The objects (or object) on which an operator operates are called operands. Python provides a few tools that allow you to fine-tune the operations behind the assignment of attributes. Making statements based on opinion; back them up with references or personal experience. Note: The matrix multiplication operator (@) doesnt support augmented assignments yet. Using type hints in assignment statements that initialize variables to empty collection data typessuch as lists, tuples, or dictionariesallows you to provide more context about how your code works. However, you can also use descriptors and, in some cases, the .__setitem__() special method. You can use the += operator to increment counter by 1 using the following code: In this example, the += operator, known as augmented addition, adds 1 to the previous value in counter each time you run the statement counter += 1. This way, your two variables refer to the same initial value of 0. The class works as expected. The good news is that you can use the variable annotation syntax in an assignment statement with the = operator: The first statement in this example is what you can call an annotated assignment statement in Python. Now youre ready to look at other assignment variants that you can use in your code or find in other developers code. Probably will use a dictionary next time I do something like this. pandas.DataFrame.eval pandas 2.0.3 documentation Heres an example of updating an individual value in a list: In this example, you update the value at index 2 using an assignment statement. If you try to use a keyword as a variable name in an assignment, then you get a SyntaxError: Whenever you try to use a keyword as the left operand in an assignment statement, you get a SyntaxError. What Time Does Tsa Open At Sfo, Body Language Of Someone Who Doesn't Like You, Sullivan's Nyc Bourdain, Articles P
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python eval assignment

python eval assignment

It provides a numeric interval where multiple assignments behave the same as independent assignments. However, these types of operations can be useful in some situations. A value or an expression that evaluates to a concrete value, The path to the current directory as a string, The names of all the immediate subdirectories as a list of strings, The names of all the files in the current directory as a list of strings, Run the operation defined by the operator that prefixes the. To decrement the control variable, index, you use an augmented subtraction statement that subtracts 1 from the variable in every iteration. On the other hand, the assignment operator () is used to assign a value to a variable. eval is a built-in- function used in python, eval function parses the expression argument and evaluates it as a python expression. This statement works as follows: In practice, an augmented assignment like the above is equivalent to the following statement: As you can conclude, augmented assignments are syntactic sugar. Remember that strings dont have the same methods and attributes as lists or dictionaries, for example. To write this class, you must set up a validation mechanism to reject non-numeric values. In the example below, you add a lemon key to inventory: In this example, you successfully add a new key-value pair to your inventory with 100 units. Another way to fine-tune the operations behind an assignment statement is to provide a custom implementation of .__setitem__() in your class. These topics will take you through several interesting and useful examples that showcase the power of Pythons assignment statements. Whatever you are doing you should not use eval. In this case, you can use the with statement to open the file using the built-in open() function. As an example, say that you have a hello.txt file with the following content: You want to open this file and print each of its lines on your screen. Unlike expressions, assignment statements dont have a return value because their purpose is to make the association between the variable and its value. Note that x must be previously defined for the operators to work correctly. The central component of an assignment statement is the assignment operator. Their immutability means that you cant change their items in place: You cant use the assignment operator to change individual items in tuples or strings. Youve learned a lot about augmented assignment operators and statements in this and the previous sections. Note: Because Python sets are also iterables, you can use them in an iterable unpacking operation. can only concatenate tuple (not "list") to tuple, can only concatenate str (not "tuple") to str, ['__builtins__', '__doc__', , '__spec__', 'help'], ['__builtins__', '__doc__', , '__spec__', 'help', 'sys'], control_variable=0 id(control_variable)=4376944840, control_variable=1 id(control_variable)=4376944872, control_variable=2 id(control_variable)=4376944904, control_variable=3 id(control_variable)=4376944936, control_variable=4 id(control_variable)=4376944968. Once you leave the except block, the target variable goes out of scope, and you cant use it anymore. is the locals() dictonary in python read-only when debugging? Assignment is a statement, not an expression. You can write them in several ways, depending on your specific needs and preferences. Dropping away unwanted values from the iterable is a common use case for the iterable unpacking operator. Note: If the left operand is mutable, then x += y may not be completely equivalent to x = x + y. To learn more, see our tips on writing great answers. Then you isolate the hypotenuse variable in the original equation by using the sqrt() function. PEP 572 - Assignment Expressions | peps.python.org The string representation of an object. Built-in Functions Python 3.11.4 documentation Commenting Tips: The most useful comments are those written with the goal of learning from or helping out other students. Unlike regular assignments, assignment expressions have a return value, which is why theyre called expressions in the first place. Toggle navigation of old-assignment-from-none / W1111. In this example, the assignment inserts a new item into your target list. How come you cant use list() to build a list from a call to map() that returns a generator of square numbers? assignment-from-none / E1128; . The first one assigns the string "Hello, World!" If you call dir(), then youll realize that np and pd are now in your namespace. Read on to see the assignment statements in action! Remember that to create a tuple, you just need a series of comma-separated elements. The eval () function parses the python expressions and runs the code passed to it as a parameter within the python program. The _ variable is a placeholder that guarantees that the unpacking works correctly. In Python, the eval () function is used to evaluate a string as a Python expression. 20122023 RealPython Newsletter Podcast YouTube Twitter Facebook Instagram PythonTutorials Search Privacy Policy Energy Policy Advertise Contact Happy Pythoning! docs.python.org/2/library/functions.html#locals. For a deep dive into this special type of assignment, check out The Walrus Operator: Python 3.8 Assignment Expressions. Almost, but I need to dynamically assign the variable name. In Python, youll find a few situations in which using assignments is either forbidden or dangerous. Problematic code: eval ("[1, 2, 3]") # [eval-used . Go ahead and run the following code to try out the new implementation of Point: Great! The Eval Function in Python: A Powerful but Dangerous Weapon In Python, a variable is a name that refers to a concrete value or object, allowing you to reuse that value or object throughout your code. It can lead to subtle bugs that can be difficult to track down. In this example, its a placeholder for a generic operator. Consider the following examples and pay attention to the result of calling the id() function: Mutable sequences like lists support the += augmented assignment operator through the .__iadd__() method, which performs an in-place addition. 586), Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Temporary policy: Generative AI (e.g., ChatGPT) is banned, syntax error trying to eval code block containing assignment. ast Abstract Syntax Trees Python 3.11.4 documentation Assignment Operators in Python - GeeksforGeeks Python: How can I save the output of eval() in a variable? The Python 3.8 documentation also includes some good examples of assignment expressions. This addition is possible because dictionaries dont have consecutive indices but unique keys, which are safe to add by assignment. Python also offers augmented assignment operators for most math operators. Therefore, try to find an alternative name or use a synonym whenever you find yourself using this convention. Example. Not the answer you're looking for? The next example consists of a regular assignment statement. As its name implies, the function is used to evaluate a Python expression. So, you should be aware of them and know how they work in practice. * If the expression is empty. This assignment isnt allowed because theres no way to guarantee that new indices will be consecutive. You can determine this interval using a small script like the following: This script helps you determine the interning interval by comparing integer numbers from -10 to 500. The assignment is done by position. Its also useful when you want to make your imported names non-public using a leading underscore, like in import sys as _sys. This new statement is known as an assignment expression or named expression. In contrast, if you use a number that falls outside of the interning interval, then your variables will point to different objects instead. When you define a class with the class keyword, youre assigning a specific name to a class object. Note: Computing the sum of a series of numeric values is a common operation in programming. Unpacking an iterable means assigning its values to a series of variables one by one. You can actually put exec() command inside eval(), So your statement would look like eval("exec('x = 1')"). Does this change how I list it on my CV? - Frank Yellin Oct 5, 2020 at 17:29 1 exec does what you want. Python Operators: Arithmetic, Logical, Comparison, Assignment, Bitwise You can't, since variable assignment is a statement, not an expression, and eval can only eval expressions. The @ character here marks a variable name rather than a column name, and lets you efficiently evaluate expressions involving the two "namespaces": the namespace of columns, and the namespace of Python objects.Notice that this @ character is only supported by the DataFrame.eval() method, not by the pandas.eval() function, because the pandas.eval() function only has access to the one (Python . Check out Pythons Counter: The Pythonic Way to Count Objects for a complete guide on how to use this tool. Connect and share knowledge within a single location that is structured and easy to search. In contrast, with immutable sequences, the data can only come as objects of the same type. Get tips for asking good questions and get answers to common questions in our support portal. The general syntax of an assignment statement is as follows: This expression looks like a regular assignment. The decorator syntax is syntactic sugar for replacing the previous assignment, which you can now write as follows: Even though this new code looks pretty different from the above assignment, the code implicitly runs the same steps. Python Assignment Operators Example - Online Tutorials Library For a concrete example of when youd need to swap values between variables, say youre learning how to implement the bubble sort algorithm, and you come up with the following function: In the highlighted line, you use a parallel assignment to swap values in place if the current value is less than the next value in the input list. Python assignment operators are used for assigning the value of the right operand to the left operand. The parameter will hold a reference to the input arguments. If you provide a name, then the function uses it instead of the default one. This additional behavior is another important detail to consider in this kind of statement. For example, the expression a == 42 is equivalent to 42 == a. pyspark.pandas.DataFrame.eval PySpark 3.4.1 documentation Now check what happens when you use a greater initial value: Now n and m hold different memory addresses, which means they point to different instances of the integer number 300. Consider using `ast.literal_eval` for safely evaluating strings containing Python expressions from untrusted sources. If you run the script from your command line, then youll get an output like the following: This output means that if you use a single number between -5 and 256 to initialize several variables in independent statements, then all these variables will point to the same object, which will help you save small bits of memory in your code. Note: Like C, Python uses == for equality comparisons and = for assignments. 6. Expressions Python 3.11.4 documentation Python automatically stores this value in the _ variable. Can Gayatri Mantra be used as background song in movies? For the expression to work correctly, the enclosing parentheses are required in most use cases. How can I assign the value of a variable using eval in python? . Thats the interning interval for integer numbers. A simple statement is comprised within a single logical line. The assignment operator unpacks these values into the four variables on the left side of the statement. Method 1: Simple Assignment The most straightforward way to store the result of an eval () expression in a Python variable is to as s ign the whole return value to the variable. Then you call len() to get the number of values in the list. The syntax to write these types of assignment statements is the following: In the first construct, expression can return any Python object, including another list. You can concatenate tuples to tuples and strings to strings, for example. inplace bool, default False. string. You can use this statement for two main purposes: When you use a variable name as the left operand in an assignment statement for the first time, youre creating a new variable. Learn more about Teams Keywords are an intrinsic part of the language and cant be overridden. Sometimes, you need to name variables, but the desired or ideal name is already taken and used as a built-in name. In this specific example, when Python tries to compute x + 1, it finds that x isnt defined. The right-hand operand in an assignment statement can be any Python object, such as a number, list, string, dictionary, or even a user-defined object. Theyre a fundamental part of the language, providing an explicit way to create, initialize, and mutate variables. Even though running multiple assignments on the same variable during a programs execution is common practice, you should use this feature with caution. If you ever need to initialize a list with a bunch of empty sublists, then use a list comprehension: This time, when you populate the first sublist of matrix, your changes arent propagated to the other sublists. To clarify this ambiguity, you can provide the appropriate type hint for users: Now youre clearly communicating that users will hold a list of User instances. I tried eval('x = 1') but that won't work. pandas.eval pandas 2.0.3 documentation You can evaluate any expression in Python, and get one of two answers, True or False. This is used to. Why did CJ Roberts apply the Fourteenth Amendment to Harvard, a private school? It takes a string as an argument and returns the result of evaluating the expression. Python's eval () allows you to evaluate arbitrary Python expressions from a string-based or compiled-code-based input. For example, say that you need to define a counter variable to count some stuff in your code. The 2.x code was used because it's a convenient way to, e.g. Free Source Code: Click here to download the free assignment operator source code that youll use to write assignment statements that allow you to create, initialize, and update variables in your code. Immutable sequences, such as tuples and strings, dont provide an .__iadd__() method. In Python, assigning a new value to an existing variable doesnt modify the variables current value. The print() statement at the end prints the value of x, which is 20. The as keyword assigns the raised exception to error. Note: Even though adding an underscore at the end of a name is an officially recommended practice, it can be confusing sometimes. Developers use AI tools, they just dont trust them (Ep. Compound statements are those that require an indented block, such as for and while loops, conditionals, with statements, try except blocks, and class or function definitions. You wont use the values that end up in this disposable variable. Youll learn about augmented assignments. Heres an example: From this point on, the name greet refers to a function object that lives at a given memory address in your computer. If you dont provide a name during the call to greet(), then the function uses the default value provided in the definition. The expression string to evaluate. To actually define it, you need to use an assignment. Connect and share knowledge within a single location that is structured and easy to search. Therefore, they should point to different instances of the number 42. They store memory addresses rather than objects. Thanks to the Coordinate descriptor, you now have a more concise and non-repetitive version of your original code. Through an import statement, you assign a name to a module object, class, function, or any other imported object. They provide a shorthand notation for a specific and popular kind of assignment. You can avoid this extra step by combining it with the first use of the target value, len(sample), using an assignment expression like the following: The assignment expression introduced in the conditional computes the sample size and assigns it to n. This way, you guarantee that you have a reference to the sample size to use in further computations. Note: In the example above, if your target iterable is a sequence data type, such as a list or tuple, then its best to access its last item directly. Those use cases include variable creation and initialization, parallel assignments, iterable unpacking, augmented assignments, and more. In contrast, the statement a = 42 is correct and legal, while 42 = a isnt allowed. Note that since _ is a regular variable, you can use it in other expressions: In this example, you first create a list of values. In the following sections, youll learn when using assignment statements isnt allowed in Python. Therefore, you cant use a regular assignment to assign a value to a variable within the context of an expression. Finally, note that accessing a variable in an interactive session returns the value stored in the target variable. Related Tutorial Categories: python - Syntax error when using an assignment (of a lambda) in eval Youll also learn about some situations in which using assignments should be avoided if you want to keep your code consistent and robust. The objects (or object) on which an operator operates are called operands. Python provides a few tools that allow you to fine-tune the operations behind the assignment of attributes. Making statements based on opinion; back them up with references or personal experience. Note: The matrix multiplication operator (@) doesnt support augmented assignments yet. Using type hints in assignment statements that initialize variables to empty collection data typessuch as lists, tuples, or dictionariesallows you to provide more context about how your code works. However, you can also use descriptors and, in some cases, the .__setitem__() special method. You can use the += operator to increment counter by 1 using the following code: In this example, the += operator, known as augmented addition, adds 1 to the previous value in counter each time you run the statement counter += 1. This way, your two variables refer to the same initial value of 0. The class works as expected. The good news is that you can use the variable annotation syntax in an assignment statement with the = operator: The first statement in this example is what you can call an annotated assignment statement in Python. Now youre ready to look at other assignment variants that you can use in your code or find in other developers code. Probably will use a dictionary next time I do something like this. pandas.DataFrame.eval pandas 2.0.3 documentation Heres an example of updating an individual value in a list: In this example, you update the value at index 2 using an assignment statement. If you try to use a keyword as a variable name in an assignment, then you get a SyntaxError: Whenever you try to use a keyword as the left operand in an assignment statement, you get a SyntaxError.

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