Using Spec Files — PyInstaller 6.16.0 documentation

the first thing PyInstaller does is to build a spec (specification) file myscript.spec. That file is stored in the --specpath directory, by default the current directory. The spec file tells PyInstaller how to process your script. It encodes the script names and most of the options you give to the pyinstaller command. The spec file is actually executable Python code. PyInstaller builds the app by

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Pyinstaller で exe 化した際の DLL の設定方法について。