ModuleNotFoundError: No module named 'pysqlite2'

出现问题：

Traceback (most recent call last):
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 31, in <module>
    from pysqlite2 import dbapi2 as Database
ModuleNotFoundError: No module named 'pysqlite2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 33, in <module>
    from sqlite3 import dbapi2 as Database
  File "/usr/local/lib/python3.6/sqlite3/__init__.py", line 23, in <module>
    from sqlite3.dbapi2 import *
  File "/usr/local/lib/python3.6/sqlite3/dbapi2.py", line 27, in <module>
    from _sqlite3 import *
ModuleNotFoundError: No module named '_sqlite3'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/core/management/__init__.py", line 312, in execute
    django.setup()
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/python/.virtualenvs/django/lib/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 "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/contrib/auth/models.py", line 41, in <module>
    class Permission(models.Model):
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/models/base.py", line 139, in __new__
    new_class.add_to_class('_meta', Options(meta, **kwargs))
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/models/base.py", line 324, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/models/options.py", line 250, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/__init__.py", line 36, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/utils.py", line 240, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/home/python/.virtualenvs/django/lib/python3.6/site-packages/django/db/utils.py", line 111, in load_backend
    return import_module('%s.base' % backend_name)
  File "/home/python/.virtualenvs/django/lib/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

原因：

使用的python版本和django的版本不太合适。