“Nenhum módulo chamado 'pysqlite2'” Erro

Question

Estou tentando executar um servidor, mas recebo este erro:

$ python manage.py runserver
Traceback (most recent call last):
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py", line 33, in <module>
    from pysqlite2 import dbapi2 as Database
ImportError: No module named 'pysqlite2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py", line 35, in <module>
    from sqlite3 import dbapi2 as Database
  File "/usr/local/lib/python3.4/sqlite3/__init__.py", line 23, in <module>
    from sqlite3.dbapi2 import *
  File "/usr/local/lib/python3.4/sqlite3/dbapi2.py", line 27, in <module>
    from _sqlite3 import *
ImportError: 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/user/Demo/lib/python3.4/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/home/user/Demo/lib/python3.4/site-packages/django/core/management/__init__.py", line 354, in execute
    django.setup()
  File "/home/user/Demo/lib/python3.4/site-packages/django/__init__.py", line 21, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/user/Demo/lib/python3.4/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/user/Demo/lib/python3.4/site-packages/django/apps/config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/user/Demo/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/user/Demo/lib/python3.4/site-packages/django/contrib/auth/models.py", line 40, in <module>
    class Permission(models.Model):
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/models/base.py", line 122, in __new__
    new_class.add_to_class('_meta', Options(meta, **kwargs))
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/models/base.py", line 297, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/models/options.py", line 166, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/__init__.py", line 40, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/utils.py", line 242, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/utils.py", line 108, in load_backend
    return import_module('%s.base' % backend_name)
  File "/home/user/Demo/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/user/Demo/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py", line 38, in <module>
    raise ImproperlyConfigured("Error loading either pysqlite2 or sqlite3 modules (tried in that order): %s" % exc)
django.core.exceptions.ImproperlyConfigured: Error loading either pysqlite2 or sqlite3 modules (tried in that order): No module named '_sqlite3'

e quando tento instalar o Sqlite:

$ pip install sqlightCollecting sqlight
  Could not find any downloads that satisfy the requirement sqlight
  No distributions at all found for sqlight

O que devo fazer?

    

Answer 1

Eu encontrei o problema principal! Quando eu estava instalando virtualenv eu não usei root, então alguns arquivos estavam faltando.

Ao configurar seu virtualenv, inicie um shell de root

sudo -i

então você pode executar este comando:

pip install virtualenv

Ao fazer isso, você pode executar Python3.4 e Django1.7 ao mesmo tempo!

Como alternativa, no meu caso:

Virtualenv foi definido por python3.4 e acho que não está sincronizado com outras versões.

Eu configurei virtualenv para usar python2.7:

$ which python
/usr/bin/python
$ virtualenv -p /usr/bin/python

e desta vez, tudo correu bem.