What syntax could be used to implement both an exponentiation operator and XOR? To get it called properly, I put it inside a list comprehension [tpl[0] for tpl globals().items())]. In this case it happens to be the third key, but there's no reliable way to know where a given variable name will end up. Presumably you meant. just another way to do this based on the content of input variable: (it returns the name of the first variable that matches to the input variable, otherwise None. It did address OP problem at the time of answer. The title of the question is a bit misleading. 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. either eval() or exec() is a dangerous method, you should confirm the safety. Ask Question Asked 3 years ago Modified 3 years ago Viewed 260 times -3 How can I get some parameters from a string in Python. Therefore the real result would rather be: So, the reverse of the eval() function won't be that useful in this case. I think in django models, fields are attributes of one class or instance, getting attribute names is not the same thing with converting variable name to string. For commenting on questions, you want to use comments, not answers. The only downside is the use of the eval() function which may easily lead to unsecured code. How to Get a Function Name as a String in Python? - Finxter Find centralized, trusted content and collaborate around the technologies you use most. In other words, if I have a variable such as: I am looking for a function/attribute, e.g. After reading the previous answers, I developed the solution below. Yes, I'm aware I can do this, but it just wasn't what I was looking for. If typing the '','' is too cumbersome, you could accept e.g. 3 Ways to Convert String to Variable Name in Python Options to insulate basement electric panel, Non-Arrhenius temperature dependence of bimolecular reaction rates at very high temperatures. However, the source code/AST nodes in the previous frames are not always available, or they could be modified by other environments (e.g: pytest's assert statement). This has nothing to do with the print statement, just with how string interpolation works. As opposed to functions, Python variables do not have the __name__ attribute. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please let me know if you have any questions or you can submit issues on Github. Installed using the following. I would not have readily known what that meant, compared the the normal declaration of a dict that the OP uses Use format() if you can, it works better and in more places. On the create parameter page, enter in a name for the value. What Python really has are "names" which can have objects bound to them. Well the dictionary way is likely the best way to go. Here is a succinct variation that lets you specify any directory. Oracle REST Data Services API - Get a database Data Guard property Ya I noticed it was already mentioned after posting. These are of course separated by spaces. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Python passes only memory addresses as arguments to functions. 1 For constants, you can use an enum, which supports retrieving its name. present more friendly messages when the source code is not available or AST nodes are not accessible, skip intermediate frames (allows the function to be wrapped or called in other intermediate frames). Trying to create function called parseExtension that takes a file name as a string parameter and returns the file extension. It only works if the random_function() can resolve the 'argument_data' string to an actual identifier. It would have saved typing, reduced the chance for errors, and made the code more readable to drop the dataframes into a list and then do the export in a for loop - for df in df_list: df.to_excel(writer,sheet_name=df.name) or something similar. If the goal is to help you keep track of your variables, you can write a simple function that labels the variable and returns its value and type. For constants, you can use an enum, which supports retrieving its name. ), and can be referenced by their number (e.g. 3. Why did only Pinchas (knew how to) respond? So this TLDR is misleading and this should not be the accepted answer. Nice ! Works beautifully with. It will be a list, but that list will contain the variable name you are looking for. When did a Prime Minister last miss two, consecutive Prime Minister's Questions? you may have several variables equal to the same value, If the class that we need to instance is in the same file, we can use something like this: Given a string, with a complete python path to a function, this is how I went about getting the result of said function: The best answer according to the Python programming FAQ would be: The primary advantage of this technique is that the strings do not need to match the names of the functions. @theodox I absolutely agree, as this will probably act up with, This won't work. Python3 def fun (a, b): return a**b import inspect print(inspect.signature (fun)) Output: (a, b) In what aspect is this better than getattr() ? Developers use AI tools, they just dont trust them (Ep. python - How do I pass a string as an argument name? - Stack Overflow Once we identify the assignment node, it is reliable. (In some languages, this is not the case; although there are bytes of memory used to represent the actual executable code, it isn't a discrete chunk of memory that your program logic gets to interact with directly.) Making statements based on opinion; back them up with references or personal experience. Anything else depends on the information incidentally being stored in some other object - such as the locals() of the enclosing function. What should be chosen as country of visit if I take travel insurance for Asian Countries, 4 parallel LED's connected on a breadboard, Do starting intelligence flaws reduce the starting skill count, Equivalent idiom for "When it rains in [a place], it drips in [another place]", Creating 8086 binary larger than 64 KiB using NASM or any other assembler, For a manual evaluation of a definite integral. 14 Answers Sorted by: 1337 my_function.__name__ Using __name__ is the preferred method as it applies uniformly. for example var1 = 'hello' and var2 = 'hello'. This flag is ignored for String and StringList parameter types. atomic variables don't have their name as an attribute. Can I pass the name of a parameter as an argument? Parameters Click Documentation (8.1.x) - Pallets Python - Get Function Signature - GeeksforGeeks Setup code and declare ROS2 params with rclpy Declare params with rclpy Run your node without params Run your node with params Get params with rclpy Get params one by one Get multiple params at once Set default values Again, if you forget to declare a parameter Set params with rclpy Allow undeclared params with rclpy Difference between machine language and machine code, maybe in the C64 community? In Python, a function is a value. Its a lightweight version of, this could be improved by recursively scanning the directory tree and auto-mounting usb drives. You could call whatis() using int(i_f**2), but if for some strange reason you choose to define a function called int_squared it must be declared inside the procedure where whatis() is used. The method globals().items() returns a list of tuples; in each tuple the first item is the variable name (as a string) and the second is the variable value. Using eval would probably bring up some security concerns! For this, I made some small changes to your tostr() function: ` def variabletostr(**df): variablename = list(df.keys())[0] return variablename variabletostr(df=0) ` FYI: I added this code as a new post in this thread. How to call Python function by name dynamically using a string? For example, you can name this "db_username" or "slack_token". The globals() function behaves like a dict with variable names (in the form of strings) as keys. Python: access class property from string - Stack Overflow Notice how the words "get" and "parameter" do not have a space in between them to retrieve the correct node every time. Maybe if I will also check the local list I could at least remove the "dependency"-Variable from the list, but this will not be a reliable result. A common or garden-variety Python object contains no references to its names. I have a method, and while not the most efficientit works! For example - using, Actually it works as expected. This is also the primary technique used to emulate a case construct, In case we have extra dictionaries we want to check. Safe to drive back home with torn ball joint boot? con_id (optional): integer. Plot multiple lines along with converging dotted line. Unlike func_name, it works on built-in functions as well: >>> import time >>> time.time.func_name Traceback (most recent call last): File "<stdin>", line 1, in ? It raises a value Error if no signature is provided. Adverb for when a person has never questioned something they believe. As far as checking existence you could use Globals().setdefault(var,