ParamSpec in PEP 612, but a number of patterns remain
In Modular Design higher-level modules shouldn’t depend on lower-level modules. That’s because abstract modules shouldn’t be limited by concrete solutions. Another reason is testability - modules that have direct dependencies to lower-level modules are harder to test.，推荐阅读旺商聊官方下载获取更多信息
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PostgreSQL 14–18 (with development headers)
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