Answers for "python nameerror"

index error in python

# main.py
import datetime

from gw_utility.book import Book
from gw_utility.logging import Logging


def main():
    try:
        # Create list and populate with Books.
        books = list()
        books.append(Book("Shadow of a Dark Queen", "Raymond E. Feist", 497, datetime.date(1994, 1, 1)))
        books.append(Book("Rise of a Merchant Prince", "Raymond E. Feist", 479, datetime.date(1995, 5, 1)))
        books.append(Book("Rage of a Demon King", "Raymond E. Feist", 436, datetime.date(1997, 4, 1)))

        # Output Books in list, with and without index.
        Logging.line_separator('Books')
        log_list(books)
        Logging.line_separator('Books w/ index')
        log_list(books, True)
        # Output list element outside bounds.
        Logging.line_separator('books[len(books)]')
        Logging.log(f'books[{len(books)}]: {books[len(books)]}')
    except IndexError as error:
        # Output expected IndexErrors.
        Logging.log_exception(error)
    except Exception as exception:
        # Output unexpected Exceptions.
        Logging.log_exception(exception, False)


def log_list(collection, include_index=False):
    """Logs the each element in collection to the console.

    :param collection: Collection to be iterated and output.
    :param include_index: Determines if index is also output.
    :return: None
    """
    try:
        # Iterate by converting to enumeration.
        for index, item in enumerate(collection):
            if include_index:
                Logging.log(f'collection[{index}]: {item}')
            else:
                Logging.log(item)
    except IndexError as error:
        # Output expected IndexErrors.
        Logging.log_exception(error)
    except Exception as exception:
        # Output unexpected Exceptions.
        Logging.log_exception(exception, False)


if __name__ == "__main__":
    main()

nameerror: name

Oftentimes I make the error of using a variable just before I define it
Maybe that's the issue...

AttributeError

BaseException
 +-- SystemExit
 +-- KeyboardInterrupt
 +-- GeneratorExit
 +-- Exception
      +-- StopIteration
      +-- StopAsyncIteration
      +-- ArithmeticError
      |    +-- FloatingPointError
      |    +-- OverflowError
      |    +-- ZeroDivisionError
      +-- AssertionError
      +-- AttributeError
      +-- BufferError
      +-- EOFError
      +-- ImportError
      |    +-- ModuleNotFoundError
      +-- LookupError
      |    +-- IndexError
      |    +-- KeyError
      +-- MemoryError
      +-- NameError
      |    +-- UnboundLocalError
      +-- OSError
      |    +-- BlockingIOError
      |    +-- ChildProcessError
      |    +-- ConnectionError
      |    |    +-- BrokenPipeError
      |    |    +-- ConnectionAbortedError
      |    |    +-- ConnectionRefusedError
      |    |    +-- ConnectionResetError
      |    +-- FileExistsError
      |    +-- FileNotFoundError
      |    +-- InterruptedError
      |    +-- IsADirectoryError
      |    +-- NotADirectoryError
      |    +-- PermissionError
      |    +-- ProcessLookupError
      |    +-- TimeoutError
      +-- ReferenceError
      +-- RuntimeError
      |    +-- NotImplementedError
      |    +-- RecursionError
      +-- SyntaxError
      |    +-- IndentationError
      |         +-- TabError
      +-- SystemError
      +-- TypeError
      +-- ValueError
      |    +-- UnicodeError
      |         +-- UnicodeDecodeError
      |         +-- UnicodeEncodeError
      |         +-- UnicodeTranslateError
      +-- Warning
           +-- DeprecationWarning
           +-- PendingDeprecationWarning
           +-- RuntimeWarning
           +-- SyntaxWarning
           +-- UserWarning
           +-- FutureWarning
           +-- ImportWarning
           +-- UnicodeWarning
           +-- BytesWarning
           +-- ResourceWarning