ImportError: No module named pytz卸掉Python2就OK了

Traceback (most recent call last):

  File "manage.py", line 8, in <module>

    from django.core.management import execute_from_command_line

  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 13, in <module>

    from django.core.management.base import (

  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 17, in <module>

    from django.db.migrations.exceptions import MigrationSchemaMissing

  File "C:\Python27\lib\site-packages\django\db\migrations\__init__.py", line 2, in <module>

    from .operations import *  # NOQA

  File "C:\Python27\lib\site-packages\django\db\migrations\operations\__init__.py", line 1, in <module>

    from .fields import AddField, AlterField, RemoveField, RenameField

  File "C:\Python27\lib\site-packages\django\db\migrations\operations\fields.py", line 4, in <module>

    from django.db.models.fields import NOT_PROVIDED

  File "C:\Python27\lib\site-packages\django\db\models\__init__.py", line 3, in <module>

    from django.db.models.aggregates import *  # NOQA

  File "C:\Python27\lib\site-packages\django\db\models\aggregates.py", line 5, in <module>

    from django.db.models.expressions import Func, Star

  File "C:\Python27\lib\site-packages\django\db\models\expressions.py", line 5, in <module>

    from django.db.backends import utils as backend_utils

  File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 12, in <module>

    from django.utils.timezone import utc

  File "C:\Python27\lib\site-packages\django\utils\timezone.py", line 8, in <module>

    import pytz

ImportError: No module named pytz