(venv) PS C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject> django-admin startproject demo
Traceback (most recent call last):
  File "E:\Python\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "E:\Python\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\Scripts\django-admin.exe\__main__.py", line 4, in <module>
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\core\management\__init__.py", line 13, in <module>
    from django.core.management.base import (
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\core\management\base.py", line 17, in <module>
    from django.db.migrations.exceptions import MigrationSchemaMissing
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\migrations\__init__.py", line 2, in <module>
    from .operations import *  # NOQA
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\migrations\operations\__init__.py", line 1, in <module>
    from .fields import AddField, AlterField, RemoveField, RenameField
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\migrations\operations\fields.py", line 3, in <module>
    from django.db.models.fields import NOT_PROVIDED
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\models\__init__.py", line 5, in <module>
    from django.db.models.deletion import (
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\models\deletion.py", line 5, in <module>
    from django.db.models import signals, sql
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\models\sql\__init__.py", line 2, in <module>
    from django.db.models.sql.query import *  # NOQA
  File "C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject\venv\lib\site-packages\django\db\models\sql\query.py", line 11, in <module>
    from collections import Counter, Iterator, Mapping, OrderedDict
ImportError: cannot import name 'Iterator' from 'collections' (E:\Python\lib\collections\__init__.py)
(venv) PS C:\Users\Administrator\Desktop\pythonstudy\Code\Webproject>