如果默认编码为ascii，为什么在utf-8中编码字符串？ -蟒蛇

Question

In python, when I import sys and type:

>>> sys.getdefaultencoding()
>>> 'ascii'

why is this string automatically encoded as UTF-8?

>>> a = 'ö'
>>> a
>>> '\xc3\xb6'

Answer 1

Because the input you provided to python was

 a        =       '   ö       '
\x61\x20\x3d\x20\x27\xc3\xb6\x27

You told a to contain the byte sequence "\\xc3\\xb6" by putting those two bytes between the quotes in your console input, and so it does.