Python数据迁移，提示The datetime and django.utils.timezone modules are available, so ……问题处理

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Python数据迁移，提示The datetime and django.utils.timezone modules are available, so you can do e.g. timezone.now

解决办法：执行python manage.py makemigrations后，输入1，输入2是exit退出。然后输入timezone.now

(venv) C:\Users\songlihui\PycharmProjects\temp>python manage.py makemigrations
You are trying to add a non-nullable field 'datetimes' to result without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit, and let me add a default in models.py
Select an option: 1
Please enter the default value now, as valid Python
The datetime and django.utils.timezone modules are available, so you can do e.g. timezone.now
Type 'exit' to exit this prompt
>>> timezone.now
Migrations for 'song01app':
  song01app\migrations\0003_auto_20190530_1830.py
    - Add field datetimes to result
    - Add field gc to result
    - Add field monkey_excep to result
    - Add field nullPoint to result
    - Alter field version_num on result

(venv) C:\Users\songlihui\PycharmProjects\temp>python manage.py makemigrations