在优化完项目后，发现项目模板中以前正常识别的{% load staticfiles %}突然无法识别了，提示Unresolved library 'staticfiles'
检查settings里的设置也没有问题。启动项目都没有问题，也没报错！
# 设置静态文件访问
STATIC_URL = '/static/'
# STATIC_ROOT = os.path.join(BASE_DIR, 'static')
STATICFILES_DIRS = [
os.path.join(BASE_DIR,'static'), os.path.join(BASE_DIR, 'media')
查看了Stack Overflow中https://stackoverflow.com/questions/34679755/pycharm-unresolved-library-staticfiles，找到了答案；
解决方案：In my case this happened when PyCharm couldn't find settings.py file. This because I have - local_setting, prod_setting etc. So I go to File -> Settings -> Language & Framworks -> Django -> Settings and select appropriate file with setting of django project
