How to get list of all variables inside a function?

Question

I have a python function

def read_info():
    f = open("./info.txt", "r")
    print(f.read())

I want to list all the variables used inside the function, e.g. here f.

now i try

$ python
>> from read_info import read_info
>> dir(read_info)
>>> dir(read_info)
['__annotations__', '__call__', '__class__', '__closure__', '__code__', '__defaults__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__get__', '__getattribute__', '__globals__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__kwdefaults__', '__le__', '__lt__', '__module__', '__name__', '__ne__', '__new__', '__qualname__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']

I tried dir(read_info) but it does not show f. (As we can see in the above output of dir(read_info) we dont see the variable f)

Answer 1

You can do it inside the function with locals(). In your case

locals()["f"]

will get you what you need. Note that except in very particular cases, this is not suggested and likely to lead to code smells.