Problem Solving: NameError: name '__file__' is not defined

Today the command line you want to use os.path.dirnameencounter this problem when you view the file path:

>>> import os
>>> print(os.path.dirname(__file__))

Error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name '__file__' is not defined

Cause:
If in an interactive environment, it will burst exception. Because at this time __file__it did not generate.

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Make up the basics:

1. __file__ path to the current script is running. But it also points to different situations.
   • If you execute the command using an absolute path, __ file__ absolute path is the script.
   • If you are using a relative path, __ file__ is a relative path to the script.
2. os.path.dirname ()
   os.path.dirname (path) Returns the directory path of.