python一些編碼的轉換格式問題

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python經常有一些編碼格式的問題西面有幾種轉碼的方式：

unicodestring = u"Hello world" 

# 將Unicode轉化爲普通Python字符串："encode"  

utf8string = unicodestring.encode("utf-8")  

asciistring = unicodestring.encode("ascii")  

isostring = unicodestring.encode("ISO-8859-1")  

utf16string = unicodestring.encode("utf-16")  

# 將普通Python字符串轉化爲Unicode："decode"  

plainstring1 = unicode(utf8string, "utf-8")  

plainstring2 = unicode(asciistring, "ascii")  

plainstring3 = unicode(isostring, "ISO-8859-1")  

plainstring4 = unicode(utf16string, "utf-16")  

assert plainstring1 == plainstring2 == plainstring3 == plainstring4