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Editorial Team
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Asked: 2026-05-14T16:31:41+00:00

I am inspecting the JSON module of python 3.1, and am currently in /Lib/json/scanner.py.

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I am inspecting the JSON module of python 3.1, and am currently in /Lib/json/scanner.py. At the top of the file is the following line:

from _json import make_scanner as c_make_scanner

There are five .py files in the module’s directory: __init__ (two leading and trailing underscores, it’s formatting as bold), decoder, encoder, scanner and tool. There is no file called “json”.

My question is: when doing the import, where exactly is “make_scanner” coming from?

Yes, I am very new to Python!

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1 Answer

  1. Editorial Team

    It may be coming from a file, or it may be built-in. On Windows, it appears to be built-in.

    Python 3.1.2 (r312:79149, Mar 21 2010, 00:41:52) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import _json
>>> _json.__file__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute '__file__'

    and there is no _json.pyd or _json.dll in the offing.

    If you want to see the source, having a binary file on your machine or not is irrelevant — you’ll need the SVN browser.

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