一些关于python相对导入(absolute import) 和绝对导入(relative import) 的解释

python的import太难受了。。 

• https://stackoverflow.com/questions/14132789/relative-imports-in-python-2-7/14132912#14132912
• https://stackoverflow.com/questions/6323860/sibling-package-imports/50193944#50193944
• https://stackoverflow.com/questions/14132789/relative-imports-in-python-2-7/14132912#14132912
• https://stackoverflow.com/questions/30669474/beyond-top-level-package-error-in-relative-import
• https://stackoverflow.com/questions/35166821/valueerror-attempted-relative-import-beyond-top-level-package
• https://stackoverflow.com/questions/42689226/trying-to-make-paths-work-attempted-relative-import-beyond-top-level-package
• https://stackoverflow.com/questions/11536764/how-to-fix-attempted-relative-import-in-non-package-even-with-init-py
• https://stackoverflow.com/questions/1918539/can-anyone-explain-pythons-relative-imports
• https://stackoverflow.com/questions/49981741/i-got-an-error-attempted-relative-import-beyond-top-level-package
• https://www.python.org/dev/peps/pep-0328/#id1
• https://medium.com/pyladies-taiwan/python-%E7%9A%84-import-%E9%99%B7%E9%98%B1-3538e74f57e3
• https://stackoverflow.com/questions/22511792/python-from-dotpackage-import-syntax
• https://stackoverflow.com/questions/7279810/what-does-a-in-an-import-statement-in-python-mean
• https://docs.python.org/3/tutorial/modules.html#importing-from-a-package
• https://python3-cookbook.readthedocs.io/zh_CN/latest/c10/p03_import_submodules_by_relative_names.html
• http://www.pythondoc.com/pythontutorial3/modules.html