How does Python get the value of a variable through the variable ID

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Get the value of the variable through the variable ID

It is known that the id that gets the variable uses the function id (), so what is its inverse function?

The answer is: PyObj_FromPtr, accordingly, write a function di (), which can get the value of the variable according to the result of id ().

From _ ctypes import PyObj_FromPtr def di (obj_id): "" get the value of the variable through the variable ID "" return PyObj_FromPtr (obj_id) if _ name__ = "_ _ main__": I = {"j": 99, "name": "jack"} var_id = id (I) print (var_id) print (di (var_id))

What's the point of doing this?

The answer is that Python script interpretation is useful. If you want to write a Python script interpreter, you get a line of string: "I = j". Normally you split the string to get I = "j", but if you already know JF10, how do you make I = 10? After a series of id () di () Dafa, this small goal can be achieved.

The method code for the second implementation is similar

Import ctypes value='hello world' # defines a string variable address=id (value) # gets the address of the value and assigns it to addressget_value=ctypes.cast (address, ctypes.py_object). Value # read the variable print (get_value) in the address how to view the id of a variable

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Use the id () function

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