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Encoding style, data structure, more content about the list, use the list as a stack, use the list as a queue, list comprehensions, nested list comprehensions, del statements, tuples and sequences, collections, loop tricks , in-depth conditional control, comparison of sequences and other types, modules, in-depth modules, as a script to execute modules, module search paths, compiled python files, standard modules, dir functions, packages, import packages from *, references within packages, multiple The package in the directory. Input and output, formatted output, old-style string formatting, file reading and writing, file object methods, using json to store structured data, errors and exceptions, syntax errors, exceptions, exception handling, throwing exceptions.