>>> >>> >>> 42105668 >>> 42105668 >>> 'f' >>> 'ab' >>> 'f' |
import ctypes b_char = 'b' ctypes.pythonapi.PyString_AsString(id(b_char)) ctypes.memset(_, ord('f'), 1) b_char 'ab' 'ab'[1:] |
Single character strings are interned in a special array in CPython. This means mutation to the internals of a single character string will have global consequences.
(http://www.laurentluce.com/posts/python-string-objects-implementation/ has more information.)
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