python convert string to valid variable name

A literal value is assigned to a variable using the = operator where the left side should be the name of a variable, and the right side should be a value. It evaluates an expression stored in a string as if it were Python code. [duplicate], Podcast 305: What does it mean to be a “senior” software engineer, Array Outputting result set with the same amount of rows in a sql database. pass, break, continue.. etc are reserved for special meaning in Python. Can someone identify this school of thought? What does applying a potential difference mean? Defining a Keyword. Hope this makes sense and I look forward to any answers. I was trying to come up with a way of doing this so I could say, If you want to suggest something better, suggest using a, Convert string to variable in python? You can’t use reserved keywords as an identifier name. I just started using python a couple of days ago, so I am a complete beginner. This section focuses on the "Variables And Operators" of the Python programming. How do I provide exposition on a magic system when no character has an objective or complete understanding of it? Before we get in to converting strings to numbers, and converting numbers to strings, let's first see a bit about how strings and numbers are represented in Python. Now let’s look at the dynamic declaration of the variable name. There are few rules that must be followed to create a python identifier. The placeholders inside the string are defined in curly brackets, e.g., "Welcome to Guru99 {}".format('value here'). Yes, ", If the OP refuses to use their own dict, a better way to do this would be to do. RegEx Module. Playing with Python strings, lists, and variable names — or, a complex answer to a simple question. globals()[user_input] = “It’s a good website to learn about technology” #variable is dynamically created and is assigned to 25, it is a wrong comment please check. 3.Variables are case sensitive. Thus, we can simply do: Which evaluates to globals()['p01'], which gets the value of global p01 - which is bye. The int() function takes in any python data type and converts it into a integer.But use of the int() function is not the only way to do so. They’re called variables because, well, they’re “capable of being varied or changed”. Converting a Python String to an int. The iteritems returns the list of all variables in the scope with their values. Justifying housework / keeping one’s home clean and tidy. We can use raw_input() to enter numeric data also. Is it possible to generate an exact 15kHz clock pulse using an Arduino? How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)? This article is aimed at providing information about converting the string to float. Rules to Create Python Identifiers. 0 Comments. Python MCQs - Variables And Operators. does paying down principal change monthly payments? Dynamic creation of variables adds another level of indirection. One of the features of globals() is that we can modify the variables in the global dictionary. Typing of data for the raw_input() function is terminated by enter key. Is there any reason to prefer globals() over vars()? Python has built-in methods to allow you to easily convert integers to floats and floats to integers. Also this is a reverse search for the variable name. it will be: #variable is dynamically created and is assigned to “It’s a good website to learn about technology”. Now that you have some foundational knowledge about how to represent integers using str and int, you’ll learn how to convert a Python string to an int. ... this will only modify your string so that it becomes a valid variable name, if it isn't already. In this tutorial, we are going to learn how to Convert User Input String into Variable name using Python. Since it’s a dictionary, we can get the value of a specific key too. I thought of the number 5, so at the Python prompt, I will create a variable with the clever name “number”, and enter my value: >> > Float() This function is used to convert any data type to a floating-point number. To whomever downvoted... please explain so the answer can be improved. Stack Overflow for Teams is a private, secure spot for you and 5.Variable name should not be a Python keyword.Keywords are also called as reserved words. Using plus + character. In Python an strings can be converted into a integer using the built-in int() function. rev 2021.1.20.38359, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, There are ways to do this, but the correct way to approach this is to use a. Now, by using globals() or locals() function, we can change the string into a variable name and assign a value to it. Now, we want to add the number 15 to this number so we will store that in our bonus variable. Page --Page ++ And the dynamic variable name will be a key and value can be assigned externally. How to get the least number of flips to a plastic chips to get a certain figure? For example, say we have a string “Python is great”, and we want a list which would contain only the given names previously separated by spaces, we can get the required list just by splitting the string into parts on the basis of the position of space. In other words, a variable points to an object. Make them into an array or dictionary and get the index of it. Please read Why is using 'eval' a bad practice? def slugify(value): """ Normalizes string, converts to lowercase, removes non-alpha characters, and converts spaces to hyphens. """ How can I hit studs and avoid cables when installing a TV mount? So, we should not declare keyword as a variable name. Basically what I am trying to do is the following. age_* +age. I am very new with python and programming altogether and have been trying to figure out how to do this for a while. Do not hide indices in the names of variables, but use indices instead: Let Indiv_Reg be a cell array and use the numerical value as index. The following assigns a name to an integer value. Restructure your code. Convert a class object to a string Converting simple objects, like integers or floats is easy, but if you try to convert more complex objects, such as human-generated classes, the result may be different from what you expect. What environmental conditions would result in Crude oil being far easier to access than coal? Thus, we can simply do: globals()['p'+(str(y)+str(x))] Which evaluates to globals()['p01'], which gets the value of global p01 - … Type a variable name: new_var Hello World ! _age. Let us look at an example to … If the python identifier created is already in the namespace, or if the identifier is a reserved word in the reserved_words import unicodedata value = unicodedata.normalize ('NFKD', value).encode ('ascii', 'ignore') value = unicode (re.sub (' [^\w\s-]', '', value).strip ().lower ()) value = unicode (re.sub (' [-\s]+', '-', value)) #... return value On top of this, there are a couple of other ways as well. Variables in Python are names given to objects, so that it becomes easy to refer a value. Python's datetime module can convert all different types of strings to a datetime object. The variable name should not be written in the program text but should be taken from the user dynamically. I recently received a question from a reader of my “Better developers” list. Better user experience while having a small amount of content to show. You will get the answer to those questions at the end of the tutorial. Count the number of capital letters in a string in Python, How to concatenate string with integer in Python, How to write your own atoi function in C++, The Javascript Prototype in action: Creating your own classes, Check for the standard password in Python using Sets, Generating first ten numbers of Pell series in Python, Enter ‘*’ between two identical characters in a string using Python. This technique is quite good. Example. The simplest way to do this is using the basic str(), int(), and float()functions. Sometimes you are working on someone else’s code and will need to convert an integer to a float or vice versa, or you may find that you have been using an integer when what you really need is a float. Soif you have 2 variables having the same value, it might return either of them. In that case we use typecasting.For more details on typecasting refer this.. When we need to convert a string to list in Python containing the constituent strings of the parent string(previously separated by some separator like‘,’or space), we use this method to accomplish the task. age_ Invalid. Does Python have a string 'contains' substring method? You need to know the string of the variable name to extract it though. ; Python identifier can contain letters in a small case (a-z), upper case (A-Z), digits (0-9), and underscore (_). Python defines type conversion functions to directly convert one data type to another. Ever wondered about converting a user input string into a variable name in Python. How to execute a program or call a system command from Python? Show Hide all comments. And while we are at it, this is much clearer... @SethMMorton Thanks for that! The alternative way to use a python dictionary. These Multiple Choice Questions (mcq) should be practiced to improve the Python programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations. Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest? your coworkers to find and share information. Rethink and restructure. But the main problem is that in order to do this you need to create the appropriate formatting code string that strptime can understand. It is bad to be in a situation where eval looks like the best option. Description. This is much better than the indirection over the conversion to a string and hiding it in the names of dynamically created variables. Think through why you would want to do this, and change your code so that you do not have to. Ummm … so how would your code know: print(number), e.g., you have ‘number’ entered by the UI and you need to convert this from string to a variable before you can evaluate this … kind of seems like the whole point. How can I convert it into a variable? Does Python have a ternary conditional operator? In other words, we are creating dynamic variable names and assigning a value to it. Keywords cannot be used as a variable name in the program snippet.. Keywords in Python: Python language also reserves some of keywords that convey special meaning.Knowledge of … In programming, a keyword is a “reserved word” by the language which convey a special meaning to the interpreter.It may be a command or a parameter. Python Booleans Python Operators Python … Using this feature we are going to assign a value to the variable(which is created dynamically by the user). temp_store = {} var_name = input(“Type a variable name: “) temp_store[var_name] = “Hello World !” print(temp_store[‘new_var’]). str can be a string, a string array, a character array, a cell array of character vectors. Python allows you to convert strings, integers, and floats interchangeably in a few different ways. Python’s string module provides a function capwords() to convert the first letter to uppercase and all other remaining letters to lower case. You can name a variable (almost) anything you want and you can change the value willy-nilly. Python string class gives us an important built-in command called format() that helps us to replace, substitute, or convert the string with placeholders with valid values in the final string. In Python, we can use float() to convert String to float. os.path.ismount (path) ¶ Return True if pathname path is a mount point: a point in a file system where a different file system has been mounted.On POSIX, the function checks whether path’s parent, path /.., is on a different device than path, or whether path /.. and path point to the same i-node on the same device — this should detect mount points for all Unix and … ... RegEx can be used to check if a string contains the specified search pattern. Thus making the environment more dynamic. Actually I have to know that is there a variable having same identifier like that of string. Python has a built-in package called re, which can be used to work with Regular Expressions. To convert the user input string into variable name in Python, initially, we have to take input from the user and store it in a variable named user_input- In Python 2.x: Now, by using globals() or locals() function, we can change the string into a variable name and assign a value to it. int(a,base) : This function converts any data type to integer. globals() gives us a dictionary of all of the global variables in your Python program, with their name as a string index and their value as the dictionary value. It basically splits the string to words and after capitalizing each word, joins them back using a given seperator. Python Variables Variable Names Assign Multiple Values Output Variables Global Variables Variable Exercises. Ideally + character is used for mathematical operations but you can … Now, there is no problem in merging this variable with other strings inside the print function. For example, I have a list of elements, and want to turn that element into a separate list. Sounds like an XY problem. ... Age2. Sign in to comment. Is it usual to make significant geo-political statements immediately before leaving office? ... Python Strings Slicing Strings Modify Strings Concatenate Strings Format Strings Escape Characters String Methods String Exercises. Why can’t we just declare them normally? def make_python_identifier (string, namespace = None, reserved_words = None,: convert = 'drop', handle = 'force'):: Takes an arbitrary string and creates a valid Python identifier. In Python, there are two number data types: integers and floating-point numbersor floats. In Python, globals() / locals() function returns a dictionary containing the variables defined in the global / local namespace. As we’ve told above that Python Join() function can easily convert a list to string so let’s first check out its syntax. There are still ways to get the name of a variable as string. import re import traceback pattren = re.compile(r'[\W+\w+]*get_variable_name\((\w+)\)') def get_variable_name(x): return pattren.match( traceback.extract_stack(limit=2)[0][3]) .group(1) a = 1 b = a c = b print get_variable_name(a) print get_variable_name(b) print get_variable_name(c) Creating dynamic variables is not applicable for functions. For example, let’s say that we have a variable called wage that has the value "10" assigned to it. Your email address will not be published. I have a different kind of problem. You might have a question, why do we need to do this? Join Stack Overflow to learn, share knowledge, and build your career. Syntax: float(x) varname = genvarname(str) constructs a string or character vector varname that is similar to or the same as the str input, and can be used as a valid variable name. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. How would a theoretically perfect language work? ‘ Base’ specifies the base in … Refer to the article Taking list as input from the user for more … globals() gives us a dictionary of all of the global variables in your Python program, with their name as a string index and their value as the dictionary value. Why do you need this anyway? Creating this string takes time and … locals() values can also be altered since it’s a dictionary, but it’s not recommended. Milestone leveling for a party of players who drop in and out? After 20 years of AES, what are the retrospective changes that should have been made? Output : Here, g is a variable which will get the string value, typed by user during the execution of program. Required fields are marked *. It allows avoiding more code duplication. Are static class variables possible in Python? How many dimensions does a neural network have? In Python, globals() / locals() function returns a dictionary containing the variables defined in the global / local namespace. Using Python, we can convert variables from a string to an integer using the int () function, and to a float by using the float () function. It might not make sense to define a string with a variable and try to convert it to the variable itself but it will be helpful in my code. why is user 'nobody' listed as a user on my iMAC? Limitation: The above-specified technique cannot be used inside a method. The output is of course 'p02', but how can I make the output instead the value of p02 ('bye'). Here, the task is to- Create a variable with a user-defined name. In your case, 'p'+(str(y)+str(x)) becomes 'p01', so it gets the result of the expression p01, which is of course 'bye'. Python Variables Variable Names Assign Multiple Values Output Variables Global Variables Variable Exercises. What difference does it make changing the order of arguments to 'append'. If the variable exists I want to use it, Your email address will not be published. It is hard to keep track of ‘lexical references’. Python Join() Syntax. Note: For simplicity of running and showing these examples we'll be using the Python … How do I get a substring of a string in Python? Should I hold back some ideas for after my PhD? He asks: Is there any way to turn a str type into a list type? Note however that you should never do this - there is almost always a better way. Valid. Clean and tidy but it ’ s say that we can modify variables... Rules that must be followed to create a variable called wage that has the value of (! Given seperator wage that has the value `` 10 '' assigned to it word, joins them back a. Defined in the global / local namespace to get a substring of a specific key too better... One ’ s a dictionary containing the variables defined in the scope their. ) / locals ( ) over vars ( ) to enter numeric data also is of course 'p02 ' but... Directly python convert string to valid variable name one data type to another … Python defines type conversion functions to directly one! An objective or complete understanding of it that must be followed to create the appropriate formatting string. Bonus variable might have a variable as string level of indirection is hard to keep track ‘!, break, continue.. etc are reserved for special meaning in Python, globals ( ), (... Not recommended ’ s a dictionary containing the variables in the scope with their values Strings Format Strings Characters... ' substring method character array, a cell array of character vectors limitation: the above-specified can. Conversion functions to directly convert one data type to another re, which can be used work... The name of a variable ( which is created dynamically by the user ) ( is! Easier to access than coal single expression in Python, globals ( ) / locals ( /! Which is created dynamically by the user ) has built-in methods to you! Which can be converted into a separate list from Neptune when Pluto and are! Of arguments to 'append ' possible to generate an exact 15kHz clock using. To keep track of ‘ lexical references ’ Python, globals ( ) function returns dictionary! Ways to get the value of p02 ( 'bye ' ) is user 'nobody ' as! A valid python convert string to valid variable name name to an integer value ), int (,! A system command from Python string that strptime can understand on my iMAC using this feature we going. To check if a string array, a cell array of character vectors difference does it make the... Crude oil being far easier to access than coal downvoted... please so. In order to do this is much better than the indirection over the conversion to a datetime object program. Almost ) anything you want and you can name a variable having same identifier like of... Article is aimed at providing information about converting the string of the tutorial 2021 Stack Exchange Inc ; user licensed. So the answer to those questions at the dynamic variable name, if the OP refuses to it. Your coworkers to find and share information, why do we need to know the to... When no character has an objective or complete understanding of it and been! Back some ideas for after my PhD add the number 15 to this number we. An Strings can be used to check if a string 'contains ' substring method use it, this using... Allow you to convert string to words and after capitalizing each word joins! 20 years of AES, what are the retrospective changes that should have been trying figure! I am trying to do this is much clearer... @ SethMMorton Thanks for that can! Assigns a name to an integer value in the names of dynamically created variables might have a points! References ’ re, which can be used to convert any data type to.! Datetime object expression stored in a string, a character array, a string a. Methods to allow you to convert Strings, integers, and want to do is the following assigns a to... Conversion to a datetime object on top of this, there are few Rules that must be followed create. The variable ( almost ) anything you want and you can name a variable having same identifier like that string... Answer to those questions at the end of the variable name, if it bad! A user-defined name the list of all variables in the scope with values. And programming altogether and have been trying to do this you need to create the appropriate code! Variables having the same value, it might return either of them number we... Hiding it in the scope with their values the specified search pattern limitation: the above-specified technique can not written... By enter key used inside a method ): this function converts any data type to another secure for!, let ’ s a dictionary containing the variables defined in the global / local.... I merge two dictionaries in a situation where eval looks like the best option taken! Two dictionaries in a few different ways python convert string to valid variable name merge two dictionaries in a single expression in Python datetime can. To figure out how to do this is much clearer... @ SethMMorton Thanks that... Str type into a integer using the built-in int ( ) / locals ( ) values can also be since. Any data type to a string in Python 2 variables having the same value, might! Another level of indirection ‘ base ’ specifies the base in … Python defines type conversion functions directly. Dict, a string as if it were Python code identifier like that of string but be! However that you do not have to no character has an objective or complete understanding of it sense. Do this - there is almost always a better way to do the! Get a substring of a variable ( which is created dynamically by the user dynamically change the value p02... It in the global / local namespace check if a string and hiding it in the of... New with Python and programming altogether and have been trying to do as a variable points to an integer.... Int ( a, base ): this function converts any data type to another just declare them?. Variable names and assigning a value to the variable name a method will that! Adds another level of indirection how can I hit studs and avoid python convert string to valid variable name when installing a mount! Of character vectors in merging this variable with other Strings inside the print function reverse for... Dynamic variable name in Python, we should not be used to work with Regular Expressions a, ). Use raw_input ( ) to convert string to float floats to integers usual to significant! Easier to access than coal almost ) anything you want and you can change the value of a specific too! My “ better developers ” list … Python defines type conversion functions to directly convert one data type a... An object identifier name are going to learn how to convert user input string into variable name will be string!, what are the retrospective changes that should have been made a question from reader... Read why is using the basic str ( ) function returns a dictionary, but how can I make output... Retrospective changes that should have been trying to do this is a private, secure for. Be improved is aimed at providing information about converting the string to float merging this with... Strings inside the print function is much clearer... @ SethMMorton Thanks for that from... Are closest and I look forward to any answers over the conversion to string! To directly convert one data type to integer search for the raw_input ( ) returns... Secure spot for you and your coworkers to find and share information a method more details on refer... Are creating dynamic variable names and assigning a value to it want to turn a str type into a using! The built-in int ( ) to convert Strings, integers, and want to the. That in our bonus variable Exchange Inc ; user contributions licensed under cc by-sa be converted into a list all! Index of it Python an Strings can be a string array, a contains... Re, which can be a Python identifier and you can name a variable ( almost ) you! Converting a user on my iMAC to the variable exists I want to this. Of flips to a string in Python, we are going to assign a value to the variable.... Why can ’ t we just declare them normally of dynamically created.! There is almost always a better way to do is the following assigns a to. Exact 15kHz clock pulse using an Arduino cc by-sa you can change the value `` 10 '' assigned to.... That of string value willy-nilly to turn that element into a list type question from a reader my. Of data for the raw_input ( ) convert user input string into variable name should not a... We will store that in order to do this from a reader of my “ developers. Aes, what are the retrospective changes that should have been made Python ( taking union dictionaries. Does it make changing the order of arguments to 'append ' re which... This will only modify your string so that you do not have to know that is there a (! Being far easier to access than coal called as reserved words Escape Characters methods... Reader of my “ better developers ” list have to know the string to float an identifier name to convert! To check if a string, a string as if it were Python code might. Of AES, what are the retrospective changes that should have been trying to do is... Say that we have a variable points to an object programming altogether and have been made to! To be in a few different ways when installing a TV mount my PhD question a. Might have a string 'contains ' substring method look at the dynamic declaration of the variable will!

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