'is' '==' 編碼,解碼

阿新 • • 發佈：2018-08-03

包含符號 har 默認階段小數據特殊比較區別

is 和==的區別

is比較內存地址

id() 獲取內存地址

== 比較兩邊的值
字符串

字符串不能包含特殊符號‘+ - * / @‘等等...
字符串中單個*20以內的內存地址一樣,單個*21以上內存地址不一致
字符串中如果有特殊字符的內存地址就不一樣

編碼和解碼

encode(編碼方式) 拿到明文編碼對應的字節
decode(編碼方式) 將編碼後的字節解碼成隊名的明文
用什麽編碼就用什麽進行解碼
ascii碼

支持: 英文數字符號
不支持: 中文
8位一個字節

gbk碼

支持:中\英\數字\符號
中文:16位兩個字節
英文:16位兩個字節

Unicode萬國碼

支持英\中\數字\符號
英文:32位四個字節
中文:32位四個字節

utf-8

長度可變的萬國碼
中文:24位三個字節
英文:8位一個字節

Python3中程序運行階段使用的Unicode顯示所有的內容
bytes類型

傳輸和存儲使用bytes

pycharm存儲時默認是使用utf-8

小數據池

小數據池的範圍 -5~256

'is' '==' 編碼,解碼

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'is' '==' 編碼,解碼

包含符號 har 默認階段小數據特殊比較區別 is 和==的區別 is比較內存地址 id() 獲取內存地址 == 比較兩邊的值字符串字符串不能包含特殊符號‘+ - * / @‘等等... 字符串中單個*20以內的內存地址一樣,單個*21以上內存地址

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'is' '==' 編碼,解碼

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