Accessing variable inside class from outside function in python

Question

I need to clear the list in certain conditions and the variable containing the list is inside the class function. I need to access the list from outside the class function.

Class A:
   def insideclass(self):
       values=[]
       for i in range(10):
           values.append(func())

def func():
    if datetime.time.now()=="2021-06-25 10:15:52.889564":
       values.clear()
return datetime.time.now()


classvariable=A()
classvariable.insideclass()

I don't want to use a global variable because I have different methods inside the class with the same variable name.

Can you provide a more complete example of func and somecondition? Could you not add the condition and the call to clear to the class method? — Iain Shelvington
– Iain Shelvington, Commented Jun 25, 2021 at 4:31
i have edited to show that the condition occurs once in a while — Madan Raj
– Madan Raj, Commented Jun 25, 2021 at 4:47
i want to clear the list outside the class within a function only.. — Madan Raj
– Madan Raj, Commented Jun 25, 2021 at 4:53
Pass values as an argument to the function and perform the append and clear in the function? — Iain Shelvington
– Iain Shelvington, Commented Jun 25, 2021 at 4:54
Raising an exception in func seems like it would be cleaner? You wouldn't then have to call clear in func and could call it in the class method — Iain Shelvington
– Iain Shelvington, Commented Jun 25, 2021 at 5:08

Iain Shelvington · Accepted Answer · 2021-06-25 05:07:39Z

Updating values by passing the list as an argument:

class A:
   def insideclass(self):
       values=[]
       for i in range(10):
           func(values)

def func(values):
    now = datetime.time.now()
    if now == "2021-06-25 10:15:52.889564":
        # You can't compare a datetime to a string...
        values.clear()
    values.append(now)

You could throw an exception if the condition is met and perform the clear in the class method

class A:
   def insideclass(self):
       values=[]
       for i in range(10):
           try:
               values.append(func())
           except:
               values.clear()

def func():
    now = datetime.time.now()
    if now == "2021-06-25 10:15:52.889564":
        raise Exception('This should be a more specific error')
    else:
        return now

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