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collected articles and related code by topics. ############################# Shallow and Deep Copy http://www.python-course.eu/deep_copy.php Decorators http://y.tsutsumi.io/dry-principles-through-python-decorators.html List reverse http://effbot.org/pyfaq/how-do-i-iterate-over-a-sequence-in-reverse-order.htm Queue and deque http://stackoverflow.com/questions/717148/queue-queue-vs-collections-deque List Join http://www.diveintopython.net/native_data_types/joining_lists.html http://www.decalage.info/en/python/print_list List of class object http://en.sharejs.com/python/19915 Instance, Class and Static Methods https://realpython.com/blog/python/instance-class-and-static-methods-demystified/ Division and Remainders http://blog.csdn.net/screaming/article/details/50506813 Swap variables without temporary variable https://ask.julyedu.com/question/138 ## Advanced Data Structures Segment Trees https://www.hackerearth.com/practice/data-structures/advanced-data-structures/segment-trees/tutorial/ ## Tools Virtual environment http://docs.python-guide.org/en/latest/dev/virtualenvs/#virtualenvironments-ref ## Git How to undo a git pull? http://stackoverflow.com/questions/5815448/how-to-undo-a-git-pull How to undo a git add? http://stackoverflow.com/questions/348170/how-to-undo-git-add-before-commit How to renaming a repository https://help.github.com/articles/renaming-a-repository/ ## Classical algorithm Permutation Generation in Lexicographic order. https://en.wikipedia.org/wiki/Permutation#Generation_in_lexicographic_order ## Web Framework and Related wsgi https://www.python.org/dev/peps/pep-3333/ https://www.sitepoint.com/python-web-applications-the-basics-of-wsgi/ https://www.biaodianfu.com/cgi-fastcgi-wsgi.html ## Database Database indexing https://stackoverflow.com/questions/1108/how-does-database-indexing-work postgreSQL https://stackoverflow.com/questions/26040493/how-to-show-data-in-a-table-by-using-psql-command-line-interface redis https://realpython.com/blog/python/caching-in-django-with-redis/ ## MacOS PKG Installation postgresql install http://www.alonely.com.cn/PostgreSQL/20161018/54697.html nginx install ://www.reinbach.com/blog/uwsgi-nginx-flask-virtualenv-mac-os-x/ ## Math Power of Two https://en.wikipedia.org/wiki/Power_of_two