how to use encoding in Python when reading or writing a file

Author: DingGuodong

functions/locale_i18n/note.md

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+## how to use encoding in Python when reading or writing a file
+
+> how to use encoding in Python when reading or writing a file?
+
+> a `file` can be `.py`(such as in command line), `.csv`, `.html`,`.sql`(query for a database), etc
+
+[Unicode In Python, Completely Demystified （揭秘Python Unicode）](http://farmdev.com/talks/unicode/)
+
+简要罗列一下最重要最实用的点：
+
+Solution
+
+- Decode early （尽早decode, 将"文件"中的内容转化成 unicode 再进行下一步处理)
+  > 从文件中读出内容后，立刻解码
+- Unicode everywhere (程序内部处理都用unicode)
+  >
+- Encode late (最后encode回所需的encoding, 例如把最终结果写进结果"文件")
+  > 写入文件前才将内容编码
+
+> see also [PYTHON处理中文的时候的一些小技巧](https://coolshell.cn/articles/461.html)
+
+## Why use Unicode in Python?
+
+- handle non-English languages
+- use 3rd party modules
+- accept arbitrary text input