[Python] Import "rest_framework" could not be resolved. But I have installed...

Here's my settings.py:

INSTALLED_APPS = [
'rest_framework',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'api.apps.ApiConfig'
]

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