Python中utf-8與utf-8-sig兩種編碼格式的區別

As UTF-8 is an 8-bit encoding no BOM is required and anyU+FEFF character in the decoded Unicode string (even if it’s the firstcharacter) is treated as a ZERO WIDTH NO-BREAK SPACE.

UTF-8以字節為編碼單元，它的字節順序在所有系統中都是一様的，沒有字節序的問題，也因此它實際上並不需要BOM(“ByteOrder Mark”)。但是UTF-8 with BOM即utf-8-sig需要提供BOM。