Why is my for loop failing?

[microphone_head]

Can you tell me why my for loop isn't working?

I'm working on managing my input from my game-pad controller device.

I store most of the details in a list.
I was trying to reset/clear the button array section of the list that holds the button states.
I thought I could use "button_state =0" in a for loop, but its not working the way I hoped.

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C_LIST_BUTTONS_ARRAY =4   #   This list represents data obtained from game-pad. controller =[0, 0, 0, 0, [1, 0, 0, 0, 0, 0 ,0, 0, 0, 0, 0]]   print("Initial state of array.") for button_index in range(len(controller[C_LIST_BUTTONS_ARRAY])):     button_state =controller[C_LIST_BUTTONS_ARRAY][button_index]     print(button_state, end ="") # end for print() # ---------------------------------------------------------------------------     print("\n\nResults of for loop using in object")   #   Reset all the button states in the button array. for button_state in controller[C_LIST_BUTTONS_ARRAY]:     button_state =0 # end for #   _.   for button_state in controller[C_LIST_BUTTONS_ARRAY]:     print(button_state, end ="") # end for print() # ---------------------------------------------------------------------------     print("\n\nResults of for loop using range.")   #   Reset all the button states in the button array. for button_index in range(len(controller[C_LIST_BUTTONS_ARRAY])):     controller[C_LIST_BUTTONS_ARRAY][button_index] =0 # end for #   _.     for button_state in controller[C_LIST_BUTTONS_ARRAY]:     print(button_state, end ="") # end for print()

Output:
Initial state of array.
10000000000


Results of for loop using in object
10000000000


Results of for loop using range.
00000000000

[Windspar]

button_state point to non ref value. List, dict, and classes are ref value.

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C_LIST_BUTTONS_ARRAY = 4 controller =[0, 0, 0, 0, [1, 0, 0, 0, 0, 0 ,0, 0, 0, 0, 0]]   print(controller[C_LIST_BUTTONS_ARRAY]) controller[C_LIST_BUTTONS_ARRAY] = [0 for i in range(len(controller[C_LIST_BUTTONS_ARRAY]))] print(controller[C_LIST_BUTTONS_ARRAY])

---

When iterating over a list. It return list position value address. Not controller[4][0].
Python only create same value once in memory. All variables just point to objects memory.

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C_LIST_BUTTONS_ARRAY = 4 controller =[0, 0, 0, 0, [1, 0, 0, 0, 0, 0 ,0, 0, 0, 0, 0]]   # list object address print(id(controller[C_LIST_BUTTONS_ARRAY])) for button_state in controller[C_LIST_BUTTONS_ARRAY]:     print(id(button_state)) # value address

[microphone_head]

I'm not sure what you mean. Now you got me thinking I don't know line below is doing?

1	button_state =0

[Windspar]

button_state = 0 is just assigning local value

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class A:     def __init__(self):         self.a = 1       def __repr__(self):         return 'A:' + str(self.__dict__)   a = [0, A(), [1]]   for item in a:     print(type(item))     if isinstance(item, A):         # changing class value         item.a = 2     elif isinstance(item, list):         # changing list value         item[0] = 5     else:         # assigning local value         item = 1   print(a)

[microphone_head]

That's a good example,

Thanks.