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1. Module
If a template is introduced to display: there is no template called xxx, but we have clearly installed this template, then this may be a path conflict. The solution can be to add the installation path of the module under the python system search path. Use the command in the command line: sys.path.append('xx/xx/...')
2 bags
Packages have a certain level of directory structure, including .py files or subdirectories, and __init__.py.