Django项目创建数据库运行python manage.py migrate语句创建不了sqlite3数据库

环境：centos7装了python3，创建了虚拟环境（ll_env）并创建了一个learning_log项目，运行以下语句：

python3 manage.py migrate

出现错误，如下：

(ll_env) [root@192 learning_log]# python3 manage.py migrate
Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/core/management/__init__.py", line 357, in execute
    django.setup()
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/models/base.py", line 117, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/models/base.py", line 321, in add_to_class
    value.contribute_to_class(cls, name)
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/models/options.py", line 204, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/__init__.py", line 28, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/utils.py", line 201, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/utils.py", line 110, in load_backend
    return import_module('%s.base' % backend_name)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 66, in <module>
    check_sqlite_version()
  File "/usr/local/learning_log/ll_env/lib64/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 63, in check_sqlite_version
    raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)
django.core.exceptions.ImproperlyConfigured: SQLite 3.8.3 or later is required (found 3.7.17).

原因是我的centos系统sqlite3的版本低于3.8.3抛出的异常语句。可以选择升级sqlite3，也可以选择修改sqlite3不抛出异常，我是这常操作的，打开虚拟环境目录（ll_env）里的base.py文件，我的虚拟环境目录路径如下：

/usr/local/learning_log/ll_env/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py

找到check_sqlite_version函数，如下：

def check_sqlite_version():
    if Database.sqlite_version_info < (3, 8, 3):
        raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)

把check_sqlite_version函数里面的语句用#注释掉，并随便加上个语句就好了，如下：

def check_sqlite_version():
     a=1
    #if Database.sqlite_version_info < (3, 8, 3):
     #   raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)

此时，再运行python3 manage.py migrate语句，就可以正常创建数据库db.sqlite3了。

Django项目创建数据库运行python manage.py migrate语句创建不了sqlite3数据库

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