one type of Python objects), Your statement "it simply isn't possible" is False, as @scohe001. There is a way to work with these names, the globals() dict, but it's not clear how to use that to do what the OP asked. is there a way of extending this to global vars instead of just locals? This call fails because, apparently, function F only runs with the globals that are defined in Module F - so globals()['G'] = None. But it can be done. Literally no other language in existence does that. I already read How to get a function name as a string?. It's not always just a simple assignment. "There is absolutely no reason to ever do what you describe" - We have a local all-knowing entity here. main.py site = 'bobbyhadz.com' result = f'{site=}' print(result) # site='bobbyhadz.com' # print variable name using f-string variable_name = f'{site=}'.split('=')[0] print(variable_name) # 'site' Use the print () function to print the variable's name. stackoverflow.com/questions/58482/ruby-get-a-variables-name, "is" operator behaves unexpectedly with integers. A Few Methods for Parsing Python Command-Line Arguments Regular Expressions File Handling Standard Input Standard Output and Standard Error Custom Parsers A Few Methods for Validating Python Command-Line Arguments Type Validation With Python Data Classes Custom Validation The Python Standard Library argparse getopt A Few External Python Packages docs.python.org/3/library/string.html#string.Template. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example, int(i_f) was a valid function call only because the int function is known to Python. Do large language models know what they are talking about? Ok, there appears to be some drawbacks with this. Find centralized, trusted content and collaborate around the technologies you use most. But if you want to access the query string itself, you can do so by accessing the query_string property of the request object. for example var1 = 'hello' and var2 = 'hello'. Question of Venn Diagrams and Subsets on a Book. In Python, a function is a value. The globals() function behaves like a dict with variable names (in the form of strings) as keys. class string.Formatter The Formatter class has the following public methods: format(format_string, /, *args, **kwargs) The primary API method. It is just a name that exists in your source code - so that when you're writing the code, you can explain which thing you're talking about. The function goes through the list of IDs of values from the global scope (the namespace could be edited), finds the index of the wanted/required var or function based on its ID, and then returns the name from the list of global names based on the acquired index. Connect and share knowledge within a single location that is structured and easy to search. I am using flask and all the values arrive at a python program as strings. Thank you @synthase ! @Hugo I was searching for this to save typing. Here is a succinct variation that lets you specify any directory. Use. Please let me know if you have any questions or you can submit issues on Github. I realize instead of storing the original data as a list of things, you can store it as a dict of things, (and you can easily generate a list from the dict on the fly if you want). You could then test every variable that needs to be greater than 5, and get the variable name in the AssertionError message. 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, Python: How to get argument's name runtime, Getting function parameters from function name in python, Extract names of Command line parameter in a function, How get names of passed parameters inside a function, Accessing list of all param names and all param values inside a function. : Inspecting the source code itself is better than searching through the locals() or globals() because the latter approach doesn't tell you which of the variables are the ones you want. The only downside is that you have to type the variable twice each time you call the function. In what aspect is this better than getattr() ? And of course, it won't work at all if it's run inside the interpreter. Why did only Pinchas (knew how to) respond? :/. which saves you from repeating the argument, or. However, it's not at runtime, meaning that you have to know it's foo before you print the name out. And just if you want to get the name of a property instead an object you can. 3.10 Post-History: 18-Dec-2019, 13-Jul-2020 Table of Contents Abstract There currently are two ways to specify the type of a callable, the Callable [ [int, str], bool] syntax defined in PEP 484 , and callback protocols from PEP 544. (?P<name>.) For example - using, Actually it works as expected. In all three cases, there's an obvious way to assign a "canonical" name to the object in question. - Stack Overflow How to get parameter names from a parametrized string? It did address OP problem at the time of answer. Can I express named Python string arguments more succintly? Connect and share knowledge within a single location that is structured and easy to search. Trying to create function called parseExtension that takes a file name as a string parameter and returns the file extension. Using the variable names allows for clear and automatically generated reference. i'm facing the similar problem before, which is to convert a string to a function. Not the answer you're looking for? I end up with, Surely the relationship can be made two-way by extending, @mherzog this "is" work, but if we want to know the pointed variable name instead of the index variable name, we may need to pick [1] or other. How to call a function from a module name that is assigned to a variable, How to call a function of a module by string, Calling function from string name within object, how to pass object's function name as a parameter. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. i have a string "foo.bar", and i want to assign it to x as a function name instead of a string, which means i can call the function by x() ON DEMAND. Types can be implemented with different behavior and some are supported out of the box: str / click.STRING: The default parameter type which indicates unicode strings. 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. So, I cannot type it and it is not pointless! Some kind of a record. One flaw is that whatis() fails if it calls a function described outside the procedure where it is used. @Joelmob is there any other way to get an object by string out of the root namespace? On python3, this function will get the outer most name in the stack: It is useful anywhere on the code. First story to suggest some successor to steam power? The main benefit for me from this is that you will get any eval-related errors at the point of summoning the function. A "variable" is not a thing that takes up space in memory while the code is running. We need to identify the correct assignment by traversing the AST tree. The getattr () method returns the value of the named attribute of an object. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Non-anarchists often say the existence of prisons deters violent crime. I wanted to retrieve from globals() the key corresponding to the value of each variable. but i can't use eval() or ast.literal_eval(), because i don't want to execute this code immediately. How can I do the same for a variable? But it would be better to store the information yourself. In Python, every value is an object, meaning that you can assign names to it freely, pass it as an argument, return it from a function, etc. What would you print? How do I distinguish between chords going 'up' and chords going 'down' when writing a harmony? In practice, however, there are so many potential names for an object that it's more trouble than it's worth to try to get them. The first %s is substituted for the first element in the tuple, the second %s is substituted for the second element in the tuple, and so on for each element in the tuple. There is absolutely no reason to ever do what you describe, and there is likely a much better solution to the problem you're trying to solve.. Installed using the following. Unfortunately, get_indentifier_name_missing_function() would not see the 'original' identifier names (some_dictionary_,some_other_dictionary_2,some_other_dictionary_n). I came across a similar problem. When did a Prime Minister last miss two, consecutive Prime Minister's Questions? The problem comes up because you are confused about terminology, semantics or both. That PEP doesn't seem to cover all the formatters; I think they're the same as str.format which is documented here: Django's templating engine may also prove to be the ideal tool for the emails you are making. A function should not be responsible for validating it's parameters - that's the job of a different function. etc. 0. e.g. How do I distinguish between chords going 'up' and chords going 'down' when writing a harmony? Is Linux swap still needed with Ubuntu 22.04, Generating X ids on Y offline machines in a short time period without collision. @hobs Well, an object could be a member of a list or a dictionary or other container, or an object attribute so in that case you'd need to find the name of the containing object too and that too might be contained by another object so you may need to recursively find names until you reach an object that can be reached by the current code. Technically the information is available to you, but as others have asked, how would you make use of it in a sensible way? Care must be taken to not feed the eval() function with just about anything, especially unfiltered external-input data. Python does not have a main () function, so when the command to run . sth didn't understand the question. I'm using 2.7. i.e. python - How to get parameter names from a parametrized string? So: +1 for the given answer. itertools.ifilter() was removed in Python 3 because the built-in filter() function provides the same functionality now. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Works like a charm! string can have anything and eval would end up eval-ling it without any consideration. See more details in the README file and the API docs of the package. The most obvious alternative to what you request is a dictionary. Following method will not return the name of variable but using this method you can create data frame easily if variable is available in global scope. If another variable name is assigned the same value, however, the list will be longer. How to take large amounts of money away from the party without causing player resentment? My variablename() function searches through that list to find the variable name(s) that corresponds to the value of the variable whose name I need in string form. This will not return the name of the desired variable, but "variables". Also, here is an even better example: In practice, Python reuses the same object for integers with common values like 0 or 1, so the first example should bind the same object to all three names.