UTF-32
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การเข้ารหัส Unicode แบบความกว้างคงที่ ใช้ 4 ไบต์ต่ออักขระพอดี ทำให้แมปโค้ดพอยท์ได้โดยตรงแต่ใช้พื้นที่มากกว่า
UTF-32 is the simplest Unicode encoding: every character uses exactly 4 bytes, and the value directly corresponds to the code point. This makes random access and character counting trivial.However, UTF-32 uses 4x the memory of ASCII text and 2x that of UTF-16 for most common characters. It's rarely used for storage or transmission but can be convenient for internal string processing.
Python 3's internal string representation uses a variable-width encoding (Latin-1, UCS-2, or UCS-4) depending on the highest code point in the string, which is why `len('😀')` correctly returns 1.