Clear Variable in Python

Clear variable in python

What's wrong with self.left = None?

Should I delete variables I don't plan on using anymore?

In general, don't worry about deleting variables.

Python has garbage collection, so any objects that you can no longer access (usually because you've left their scope) will automatically be freed from memory, you don't have to worry about this at all.

The case where you might want to use del would be if you want to make it explicity clear that this variable cannot be used anymore by this part of the program.

As mentioned in the comments, this won't even necessarily delete your object.

You can read about the del keyword more here

Python JupyterNotebook: Clear variable?

test.clear() doesn't work as intended, because when you define a variable inside a function, it is created as a local variable that only exists inside the function. So the GRAPH inside test.clear() is a different object from the GRAPH you defined at the top of test.py.

One way to get the result you expect is to explicitly refer to the global GRAPH variable inside test.clear(), defining the function like this:

def clear():
    global GRAPH
    GRAPH = dict()

Make sure you force your notebook kernel to import the new version of test.py. Then running the cell with a call to test.clear() included before test.add_to_graph(f) should produce the desired effect.

How to clear variables in python automatically?

There's really no need to delete the variable at all. Python has automatic garbage collection, so if you assign a new DataFrame object to the same variable as your old one, the old one will be deleted automatically.

More specifically, variables in Python behave as references to objects, so as long as you don't create multiple variables pointing to the same DataFrame object, once you assign a new object to your variable, your old DataFrame object will no longer be referenced by any variable, and will therefore be removed by the garbage collector.

spyder - clear variable explorer along with variables from memory

In Spyder, Do following steps

Run

Configuration per file...

Clear all variables before execution [Select Checkbox]


This actually clears variables from previous run of the file. Hope it helps.

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