Nameerror name d is not defined. Nameerror name is not defined python 3. name '__file__' is not defined. nameerror: name 'x' is not defined — что означает эта ошибка?. nameerror: name 'n' is not defined.

Nameerror name d is not defined. Nameerror name is not defined python 3. name '__file__' is not defined. nameerror: name 'x' is not defined — что означает эта ошибка?. nameerror: name 'n' is not defined.
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